Edson Costa Santos

Pós-doutorado

Formação complementar

Idiomas

Áreas de atuação

Orientou

Produções bibliográficas

• Koike, H. ; KIDA, K. ; SANTOS, E. C. ; Rozwadowska, J. ; Kashima, Y. ; Kanemasu, K. . Self-lubrication of PEEK polymer bearings in rolling contact fatigue under radial loads. Tribology International , v. 49, p. 30-38, 2012.

• E. C. Santos ; K. Kida ; T. Honda ; H. Koike ; J. Rozwadowska . Fatigue Strength Improvement of AISI E52100 Bearing Steel by Induction Heating and Repeated Quenching. Materials Science , v. 47, p. 677-682, 2012.

• KIDA, K. ; URYU, M. ; T. Honda ; SANTOS, E. C. ; SARUWATARI, K. . Asymmetric Change in Three Dimensional Magnetic Fields of Bearing Steel (JIS-SUJ2) under Spherical Hertzian Contact. Applied Mechanics and Materials , v. 157-158, p. 1031-1037, 2012.

• HASHIMOTO, K. ; HIRAOKA, K. ; KIDA, K. ; Santos, E.C. . Effect of sulphide inclusions on rolling contact fatigue life of bearing steels. Materials Science and Technology , v. 28, p. 39-43, 2012.

• KIDA, K. ; Santos, E.C. ; HONDA, T. ; Koike, H. ; Rozwadowska, J. . Observation of magnetic flux density around fatigue crack tips in bearing steel using an SHPM with a three-dimensional small-gap probe. International Journal of Fatigue , v. 39, p. 38-43, 2012.

• MIZOBE, K. ; Edson C. Santos ; HONDA, T. ; H. Koike ; K. Kida . Observation of Wear in PEEK Race - PTFE Retainer Hybrid Polymer Bearings under Dry Contact. Advanced Materials Research (Online) , v. 457-458, p. 557-562, 2012.

• URYU, M. ; K. Kida ; HONDA, T. ; SARUWATARI, K. ; Edson C. Santos ; J. Rozwadowska . Changes in the Magnetic Fields of Star-Shaped JIS-SKS93 Plates Embedded in Clear Acrylic Cold Mounting Resin under Tensile Stress. Advanced Materials Research (Online) , v. 457-458, p. 884-890, 2012.

• KOGA, M. ; Edson C. Santos ; HONDA, T. ; K. Kida ; SHIBUKAWA, T. . Observation of Wear in Induction-Heat-Treated Bearing Steel Bars under Reciprocating Motion. Advanced Materials Research (Online) , v. 457-458, p. 504-510, 2012.

• K. Kida ; URYU, M. ; HONDA, T. ; Edson C. Santos ; SARUWATARI, K. . Changes in Three Dimensional Magnetic Fields of Carbon Tool Steel (JIS-SKS93) under Single Spherical Hertzian Contact. Advanced Materials Research (Online) , v. 457-458, p. 578-585, 2012.

• MIZOBE, K. ; Edson C. Santos ; HONDA, T. ; H. Koike ; K. Kida ; SHIBUKAWA, T. . Effect of Repeated Quenching on the Rotating Bending Strength of SAE52100 Bearing Steel. Advanced Materials Research (Online) , v. 457-458, p. 1025-1031, 2012.

• J. Rozwadowska ; K. Kida ; Edson C. Santos ; HONDA, T. ; H. Koike ; Kanemasu, K. . Investigation of Crack Initiation and Propagation during Rolling Contact Fatigue of SUJ2 Steel Bearings Using a Newly Developed One-Point Testing Machine. Applied Mechanics and Materials , v. 152-154, p. 1233-1238, 2012.

• HONDA, T. ; Edson C. Santos ; K. Kida ; SHIBUKAWA, T. . Microstructual Evaluation of 13Cr-2Ni-2Mo Stainless Steel Quenched by Induction Heating. Advanced Materials Research (Online) , v. 457-458, p. 525-530, 2012.

• KIDA, K. ; T. Honda ; Santos, E.C. ; SARUWATARI, K. ; URYU, M. ; HOURI, K. ; Kanemasu, K. . Magnetic Microscopic Evaluation of Early-Stage Fatigue in WMZ (Weld Metal Zone) of Low Carbon Steel Plates (JIS, SS400). Advanced Science Letters , v. 255, p. 4186-4192, 2011.

• Edson C. Santos ; K. Kida ; J. Rozwadowska ; KIDERA, M. ; CHEN, C. . Epitaxial Growth of Ni-Based Superalloys Using Laser and Spark Deposition. Advanced Materials Research (Online) , v. 418-420, p. 1564-1569, 2011.

• J. Rozwadowska ; K. Kida ; Edson Costa Santos ; HONDA, T. ; H. Koike ; Kashima, Y. ; MATSUMOTO, R. . Coating of Ti64 Bearings in Air by Using a Q-Sw Laser. Advanced Materials Research (Online) , v. 418-420, p. 393-397, 2011.

• Edson C. Santos ; K. Kida ; J. Rozwadowska ; HONDA, T. ; H. Koike ; Kashima, Y. ; Kanemasu, K. ; MATSUMOTO, R. . Wear Resistance Improvement of Titanium Bearings by Laser Gas Nitriding. Advanced Materials Research (Online) , v. 217-218, p. 988-993, 2011.

• HASHIMOTO, K. ; FUJIMATSU, T. ; TSUKAGE, N. ; HIRAOKA, K. ; KIDA, K. ; Edson C. Santos . Study of rolling contact fatigue of bearing steels in relation to various oxide inclusions. Materials in Engineering (Cessou em 1982. Cont. ISSN 0264-1275 Materials and Design) , v. 32, p. 1605-1611, 2011.

• HASHIMOTO, K. ; FUJIMATSU, T. ; TSUKAGE, N. ; HIRAOKA, K. ; K. Kida ; Edson C. Santos . Effect of inclusion/matrix interface cavities on internal-fracture-type rolling contact fatigue life. Materials in Engineering (Cessou em 1982. Cont. ISSN 0264-1275 Materials and Design) , v. 32, p. 4980-4985, 2011.

• K. Kida ; Edson C. Santos ; HONDA, T. ; H. Koike ; J. Rozwadowska ; URYU, M. ; HOURI, K. ; TANABE, H. . Effects of Magnetizations on Three Dimensional Magnetic Flux Density of Pre-Cracked Medium Carbon Low Alloy Steel (JIS S45C). Applied Mechanics and Materials , v. 83, p. 230-236, 2011.

• TANABE, H. ; K. Kida ; TAKAMATSU, T. ; ITOH, N. ; Edson C. Santos . Observation of Magnetic Flux Density Distribution around Fatigue Crack and Application to Non-Destructive Evaluation of Stress Intensity Factor. Procedia Engineering , v. 10, p. 881-886, 2011.

• Edson C. Santos ; K. Kida ; HONDA, T. ; J. Rozwadowska ; HOURI, K. ; HASHIMOTO, K. . Influence of Cyclic Heat Treatment and Oxygen Content on the Rolling Contact Fatigue of JIS SUJ2 Bearings. Advanced Materials Research (Online) , v. 217-218, p. 982-987, 2011.

• J. Rozwadowska ; K. Kida ; Edson C. Santos ; HONDA, T. ; H. Koike ; Kashima, Y. ; Kanemasu, K. ; MATSUMOTO, R. . Rolling Contact Fatigue of Titanium Alloys Coated by Gas Nitriding Using a Q-Sw Laser. Applied Mechanics and Materials , v. 83, p. 191-196, 2011.

• K. Kida ; KOGA, J. ; Edson C. Santos ; HONDA, T. . Effect of Frequency on Fatigue Cracks of Silicon Nitride Balls under Cyclic Loads. Advanced Materials Research (Online) , v. 217-218, p. 874-879, 2011.

• H. Koike ; HONDA, T. ; KIDA, K. ; Edson C. Santos ; J. Rozwadowska ; HOURI, K. ; URYU, M. ; Kashima, Y. ; Kanemasu, K. . Influence of Radial Load on PEEK Plastic Bearings Life Cycle under Water Lubricated Conditions. Advanced Materials Research (Online) , v. 217-218, p. 1260-1265, 2011.

• URYU, M. ; K. Kida ; HONDA, T. ; Edson C. Santos ; SARUWATARI, K. . Localization of Partial Magnetization around Artificial Slits in Square Bars of Medium Carbon Low Alloy Steel JIS S45C. Advanced Materials Research (Online) , v. 217-218, p. 1297-1302, 2011.

• H. Koike ; Edson C. Santos ; K. Kida ; J. Rozwadowska ; HONDA, T. . Effect of Repeated Induction Heating on Fatigue Crack Propagation in SAE 52100 Bearing Steel. Advanced Materials Research (Online) , v. 217-218, p. 1266-1271, 2011.

• HONDA, T. ; K. Kida ; Edson C. Santos ; H. Koike ; J. Rozwadowska ; URYU, M. ; HOURI, K. ; TANABE, H. . The Influence of Stress Ratio on Changes in Magnetic Flux Density around Fatigue Crack Tips of Carbon Tool Steel. Applied Mechanics and Materials , v. 83, p. 210-215, 2011.

• Edson C. Santos ; K. Kida ; CARROLL, P. ; R. Vilar . Optimization of Laser Deposited Ni-Based Single Crystal Superalloys Microstructure. Advanced Materials Research (Online) , v. 154-155, p. 1405-1414, 2010.

• HONDA, T. ; K. Kida ; Edson C. Santos ; Kashima, Y. . The Influence of Surface Texture on Rolling-Contact Fatigue of PEEK Bearings in Water. Advanced Materials Research (Online) , v. 154-155, p. 1713-1716, 2010.

• R. Vilar ; E.C. Santos ; P.N. Ferreira ; N. Franco ; R. C. da Silva . Structure of NiCrAlY coatings deposited on single-crystal alloy turbine blade material by laser cladding. Acta Materialia (Oxford) , v. 57, p. 5292-5302, 2009.

• Santos, Edson Costa ; Shiomi, Masanari ; Osakada, Kozo ; Laoui, Tahar . Rapid manufacturing of metal components by laser forming. International Journal of Machine Tools & Manufacture , v. 46, p. 1459-1468, 2006.

• Santos, Edson Costa ; Morita, Masanori ; Shiomi, Masanori ; Osakada, Kozo ; Takahashi, Masataka . Laser gas nitriding of pure titanium using CW and pulsed Nd:YAG lasers. Surface & Coatings Technology , v. 201, p. 1635-1642, 2006.

• T Laoui ; E Santos ; K Osakada ; M Shiomi ; M Morita ; S K Shaik ; N K Tolochko ; F Abe ; M Takahashi . Properties of Titanium Dental Implant Models Made by Laser Processing. Proceedings of the Institution of Mechanical Engineers. Part C, Journal of Mechanical Engineering Science , v. 220, p. 857-863, 2006.

• E C Santos ; K Osakada ; M Shiomi ; Y Kitamura ; F Abe . Microstructure and mechanical properties of pure titanium models fabricated by selective laser melting. Proceedings of the Institution of Mechanical Engineers. Part C, Journal of Mechanical Engineering Science , v. 218, p. 711-719, 2004.

• F Abe ; E C Santos ; Y Kitamura ; OSAKADA, K. ; M Shiomi . Influence of forming conditions on the titanium model in rapid prototyping with the selective laser melting process. Proceedings of the Institution of Mechanical Engineers. Part C, Journal of Mechanical Engineering Science , v. 217, p. 119-126, 2003.

• K. Kida ; Edson C. Santos ; HONDA, T. ; H. Koike ; J. Rozwadowska . Effect of heat treatments on changes in magnetic flux density around fatigue crack tips of medium carbon low alloy steel (JIS, S45C). In: 19th International Symposium on Processing and Fabrication of Advanced Materials (PFAM XIX), 2011, Auckland. Processing and Fabrication of Advanced Materials - XIX, 2011. p. 112.

• HONDA, T. ; K. Kida ; Edson C. Santos ; H. Koike ; Kashima, Y. ; Kanemasu, K. . Fatigue Behavior of Machined PEEK Ball Bearings under Rolling Contact Loading in Water. In: Nineteenth International Symposium on Processing and Fabrication of Advanced Materials (PFAM XIX) Conference, 2011, Auckland. Processing and Fabrication of Advanced Materials - XIX, 2012. p. 515.

• Edson C. Santos ; K. Kida ; HONDA, T. ; J. Rozwadowska ; HOURI, K. ; TANABE, H. . Correlation between Magnetic Flux Density and Crack Propagation in SAE 52100 Measured by Scanning Hall Probe Microscope with a Small-gap Probe. In: Nineteenth International Symposium on Processing and Fabrication of Advanced Materials (PFAM XIX) Conference., 2011, Auckland. Nineteenth International Symposium on Processing and Fabrication of Advanced Materials (PFAM XIX) Conference, 2011. p. 1541.

• K. Kida ; Edson C. Santos ; KOGA, J. . Crack growth and splitting failure of silicon nitride ceramic balls (3/16') under cyclic pressure loads. In: 13th Conference on Fracture Mechanics, 2011, Opole. Procedings of the 13th CONFERENCE ON FRACTURE MECHANICS, 2011.

• K. Kida ; Edson C. Santos ; HONDA, T. ; H. Koike ; J. Rozwadowska ; HOURI, K. ; URYU, M. ; TANABE, H. . Observation of cracks in medium carbon low alloy steel with scanning Hall probe microscope. In: New Methods of Damage and Failure Analysis of Structural Parts, 2010, Ostrava. Proceedings New Methods of Damage and Failure Analysis of Structural Parts, 2010. p. 217-226.

• Edson C. Santos ; K. Kida ; HONDA, T. ; H. Koike ; J. Rozwadowska . Improvement of the rolling contact fatigue of AISI E 52100 bearing steel by repeated quenching.. In: New Methods of Damage and Failure Analysis of Structural Parts, 2010, Ostrava. Proceedings New Methods of Damage and Failure Analysis of Structural Parts, 2010. p. 271-280.

• Edson C. Santos ; K. Kida ; HONDA, T. ; J. Rozwadowska ; HOURI, K. ; HASHIMOTO, K. . Rolling contact fatigue of repeatedly quenched SAE 52100 steels with different oxygen contents. In: Proc. International Conference on Experimental Mechanics 2010, 2010, Kuala Lumpur. Proceedings Proc. International Conference on Experimental Mechanics 2010, 2010.

• H. Koike ; Edson C. Santos ; K. Kida ; HONDA, T. ; J. Rozwadowska . Observation of fish-eye areas in SAE 52100 bearing steel heat treated by repeated induction heating and quenching. In: International Conference on Experimental Mechanics 2010, 2010, Kuala Lumpur. Proc. International Conference on Experimental Mechanics 2010, 2010.

• Koga, Junnosuke ; Kida, Katsuyuki ; Santos, Edson Costa ; Fujii, Takuya . Effects of residual stress on crack growth of silicon nitride balls under cyclic pressure loads. In: Fourth International Conference on Experimental Mechanics, 2009, Singapore. 4th International Conference on Experimental mechanics 2009(ICEM 2009), 2009. v. 7522. p. 752225-10.

• Kida, Katsuyuki ; Santos, Edson C. ; Honda, Takashi ; Tanabe, Hirotaka . Three-dimensional observations of magnetic flux density around fatigue crack tips of bearing steels. In: Fourth International Conference on Experimental Mechanics, 2009, Singapore. Proceedings of SPIE-The International Society for Optical, 7522 (ISSN: 0277-786X), 2009. v. 7522. p. 75220U-75220U-8.

• Honda, Takashi ; Kida, Katsuyuki ; Santos, Edson C. ; Tanabe, Hirotaka . Changes in magnetic flux density around fatigue crack tips of carbon tool steels. In: Fourth International Conference on Experimental Mechanics, 2009, Singapore. Proceedings of SPIE-The International Society for Optical, 7522 (ISSN: 0277-786X), 2009. v. 7522. p. 75220R-75220R-8.

• K. Kida ; Edson C. Santos ; HONDA, T. ; TANABE, H. . Eighteenth International Symposium on Processing and Frabrication of Advanced PFAM XVIII. In: Eighteenth International Symposium on Processing and Fabrication of Advanced Materials PFAM XVIII, 2009, Sendai. Proceedings Eighteenth International Symposium on Processing and Fabrication of Advanced Materials, 2009. p. 535-544.

• Edson C. Santos ; K. Kida ; R. Vilar . The Laser Powder Deposition onto CMSX-4 Single-Crystal Ni-based Substrates. In: Eighteenth International Symposium on Processing and Fabrication of Advanced Materials PFAM XVIII, 2009, Sendai. Proceedings Eighteenth International Symposium on Processing and Fabrication of Advanced Materials PFAM XVIII, 2009. p. 947-956.

• Edson C. Santos ; K. Kida ; R. Vilar ; CARROLL, P. . Laser Cladding of Rene N4 onto CMSX-4 Sngle Crystal Substrates. In: 4th Asian Conference of Heat Treatment and Surface Engineering, 2009, Beijing. Proc. 4th Asian Conference of Heat Treatment and Surface Engineering, 2009. p. 523-528.

• HONDA, T. ; K. Kida ; Edson C. Santos ; SHIBUKAWA, T. . Microstructure Evaluation of AISI 52100 Processed by Furnace and Induction Heating. In: 4th Asian Conference of Heat Treatment and Surface Engineering, 2009, Beijing. Proc. 4th Asian Conference of Heat Treatment and Surface Engineering, 2009.

• Edson C. Santos ; K. Kida ; HONDA, T. ; Kashima, Y. . Application of Laser Gas Nitriding for Improvement of Wear Resistance of Titanium Bearings. In: World Tribology Congress, 2009, Kyoto. Proceedings of the World Tribology Congress, 2009. p. 458.

• HONDA, T. ; K. Kida ; Edson C. Santos ; Kashima, Y. ; Kanemasu, K. . Investigation of the Wear Resistance of Resin Bearings under Water-Conditions. In: World Tribology Congress, 2009, Kyoto. Proceedings for the World Tribology Congress, 2009. p. 488.

• KOGA, J. ; K. Kida ; Edson C. Santos . Effects of Stress Ratio on the Fatigue Strength of Silicon Nitride Balls under Cyclic Pressure Loads. In: World Tribology Congress, 2009, Kyoto. Proceedings of the World Tribology Congress, 2009. p. 858.

• K. Kida ; KOGA, J. ; Edson C. Santos . Effects of Ball Diameters on the Fatigue Strength of Silicon Nitride Balls under Cyclic Pressure Loads. In: World Tribology Congress, 2009, Kyoto. Proceedings of the World Tribology Congress, 2009. p. 859.

• Santos, Edson Costa ; Honda, Takashi ; Kida, Katsuyuki . Influence of repeated quenching on the rolling contact fatigue of bearing steel. In: Fourth International Conference on Experimental Mechanics, 2009, Singapore. 4th International Conference on Experimental mechanics 2009(ICEM 2009), 2009. v. 7522. p. 752241-7.

• Edson C. Santos ; R. Vilar ; CARROLL, P. ; FRANCO, N. . Laser powder deposition of Ni-base single crystal superalloys. In: The Advanced Laser Application Conference and Exhibition, 2007, Boston. Proceedings of the The Advanced Laser Application Conference and Exhibition, 2007.

• Edson C. Santos ; M Morita ; Shiomi, Masanori ; Osakada, Kozo ; TAKAHASHI, M. . Influence of pulse shaping in laser gas nitriding of pure titanium. In: Japanese Autumn Conference for the Technology of Plasticity, 2004, Tokyo. Proceedings of the Japanese Autumn Conference for the Technology of Plasticity, 2004.

• Laoui, Tahar ; Edson C. Santos ; K Osakada ; Shiomi, Masanori ; M Morita ; S K Shaik ; TOLOCHKO, N. K. . Properties of Titanium Dental implant models made by laser processing. In: The Laser Assisted Net Engineering (LANE2004), 2004, Erlangen. Proceedings of The Laser Assisted Net Engineering (LANE2004), 2004.

• Edson C. Santos ; Shiomi, Masanori ; M Morita ; K Osakada ; F Abe . Fabrication of Titanium Dental Implants by Selective Laser Melting. In: Laser Precision Microfabrication, 2004, Nara. Proceedings of the Laser Precision Microfabrication, 2004.

• Edson C. Santos ; M Shiomi ; M Morita ; Osakada, Kozo ; F Abe . Laser Nitriding of Titanium Models made by Selective Laser Melting. In: Japanese Spring Conference for the Technology of Plasticity, 2004, Tokyo. Proceedings of the Japanese Spring Conference for the Technology of Plasticity, 2004.

• NOSHI, Y. ; Edson C. Santos ; M Shiomi ; K Osakada ; F Abe . Fabrication of Pure Copper Model by Laser Prototyping. In: apanese Spring Conference for the Technology of Plasticity, 2004, Tokyo. Proceedings of the Japanese Spring Conference for the Technology of Plasticity, 2004.

• NOSHI, Y. ; Edson C. Santos ; M Shiomi ; OSAKADA, K. ; F Abe . Fabrication of Copper and Aluminum Alloys Model by Laser Prototyping. In: Japanese Autumn Conference for the Technology of Plasticity, 2004, Kyoto. Proceedings of the Japanese Autumn Conference for the Technology of Plasticity, 2004.

• Edson C. Santos ; M Shiomi ; OSAKADA, K. ; F Abe . Mechanical properties of titanium models processed by selective laser melting. In: The Solid Freeform Symposium, 2002, Austin. Proceedings of The Solid Freeform Symposium, 2002.

• Edson C. Santos ; M Shiomi ; K Osakada ; F Abe . Fracture of titanium parts processed by selective laser melting. In: Japanese Spring Conference for the Technology of Plasticity, 2002, Chiba. Proceedings of the Japanese Spring Conference for the Technology of Plasticity, 2002. p. 437-438.

• KITAMURA, Y. ; Edson C. Santos ; F Abe ; K Osakada ; M Shiomi . Processing of titanium by selective laser melting for medical purposes. In: Rapid Prototyping and Manufacturing Conference and Exhibition, 2000, Malmoe. Proceedings of the Rapid Prototyping and Manufacturing Conference and Exhibition, 2000.

• Edson C. Santos ; NASCIMENTO, R. ; WENDHAUSEN, P. . Strain analysis by Moiré method ? Mechanical interferometry. In: V Regional Congress of Mechanical Engineering Students, 1998, Rio de Janeiro. Proceedings of the V Regional Congress of Mechanical Engineering Students, 1998.

• Edson C. Santos ; DIAS, A. . Generation of paths by freeform surface to off-line programming of manipulators. In: III Regional Congress of Mechanical Engineering Students, 1996, Rio de Janeiro. Proceedings of the III Regional Congress of Mechanical Engineering Students, 1996.

• Edson C. Santos . Off-line programming of manipulators. In: I Regional Congress of Mechanical Engineering Students, 1995, Rio de Janeiro. Proceedings of the I Regional Congress of Mechanical Engineering Students, 1995.

• Edson C. Santos ; K. Kida ; J. Rozwadowska ; HONDA, T. ; MIZOBE, K. ; SHIBUKAWA, T. . Microstructure and rolling contact fatigue strength of induction heated AISI 52100 bearings. Applied Mechanics and Materials , 2012.

• J. Rozwadowska ; Edson C. Santos ; K. Kida ; HONDA, T. ; Kashima, Y. ; MATSUMOTO, R. . Comparison between the RCF performance of TiN- and TiO2-laser coated Ti64 bearings. Applied Mechanics and Materials , 2012.

• URYU, M. ; K. Kida ; HONDA, T. ; Edson C. Santos ; SARUWATARI, K. . Observation of Magnetic Fields in Medium Carbon Low Alloy Steel JIS S45C under Point Contact Loading. Applied Mechanics and Materials , 2012.

• NAKANE, K. ; HONDA, T. ; Edson C. Santos ; K. Kida . Topological Difference of Grain Composition in the WMZ (Weld Metal Zone) in Low Carbon Steel Plates. Applied Mechanics and Materials , 2012.

• HONDA, T. ; K. Kida ; Edson C. Santos ; SHIBUKAWA, T. . Early stages of the wear behavior of AISI 440C stainless steel under rolling contact in water. Applied Mechanics and Materials , 2012.

Projetos de pesquisa

• 2010 - Atual

  Laser deposition of Japanese single crystal 4th generation Ni-based superalloys, Descrição: Turbine blades are key components for the performance of aircrafts and industrial gas turbines. Engine performance is closely related to the material`s capability to withstand high temperatures. Introducing Ni-based single crystal blades into the hot section of gas turbine engines represents a major advance in increasing fuel efficiency and energy saving. Also, compared to polycrystalline and directionally solidified turbines, Ni-based single crystal components help to reduce pollution. A special advantage of these materials over conventional polycrystalline Ni-based superalloys is their increased strength, e.g., yield strength and creep rupture strength, developed by introducing large amounts of refractory elements (e.g., W, Ta and Mo) and suppressing the low-melting point grain boundary strengthening elements (e.g., C, B, Zr and Hf). Since the high cost of the single crystal parts is a big limitation for wider use scope, new fabrication and especially repair methods of Ni-based single crystal components are of great economic interest. Since conventional welding techniques, such as gas tungsten arc, plasma and microplasma transferred arc and diffusion bonding processes are not suitable due to hot-cracking and stray grain formation, which leads to losing the single crystallinity characteristics, alternative repair methods are required. In Laser Powder Deposition (also referred to as Direct Metal Deposition or Laser Cladding), an object is formed layer by layer, by injecting a powder into the laser-generated melt pool while scanning the laser beam under CN control, according to a CAD model. The process allows rapid and accurate addition of controlled amounts of material at the required locations with minimal heat input, thus enabling crack-sensitive materials, such as Ni-base alloys to be deposited. By controlling laser power density, laser scan speed and processing parameters, it is possible to deposit single crystal layers free of defects (cracks or pores). As a re. , Situação: Em andamento; Natureza: Pesquisa. , Alunos envolvidos: Graduação: (0) / Especialização: (0) / Mestrado acadêmico: (0) / Mestrado profissional: (0) / Doutorado: (0) . , Integrantes: Edson Costa Santos - Coordenador / Katsuyuki Kida - Integrante., Financiador(es): Japan Society for the Promotion of Science - Bolsa.

• 2010 - Atual

  Development of small knee-joint of humanoid robot, Descrição: Large-sized robots is becoming more and more important in applications, such as medical care and lifesaving. Large gear devices constructed in the conventional way are heavy and inaccurate, as the angle of the input-output axes transmission error is approximately 1 degree. This causes serious problems in the robot?s walking process: unsteady or angular gait. This fact is the motivation for the development of a new, highly accurate joint with high torque capacity. Our group is researching a prototype of a joint element to be used in lightweight and compact joints for tall humanoid robots. The newly developed element consists of a harmonic drive gearing device, a multi axis mechanism and a resin bush. At first bush components produced from two kinds of materials: poly-ether-ether-ketone (PEEK) and polyacetal (POM) were tested. Furthermore, two testing machines to evaluate the joints were constructed: to measure the power input-output transmission error and to investigate the influence of walking-load on bush wear. The prototype joint system consists of a harmonic drive gearing device, a two-axes mechanism to output large torque and a resin bush. Compared with the conventional gearing devices for tall-sized humanoid robots, the new system provides high output torque up to 200 kgfcm for minimum 5000 cycles. In every cycle, backlash values for both PEEK and POM bush elements were less than 23 arcmin, while in the conventional devices this value reaches approximately 60 arcmin.. , Situação: Em andamento; Natureza: Pesquisa. , Alunos envolvidos: Graduação: (1) . , Integrantes: Edson Costa Santos - Integrante / Katsuyuki Kida - Coordenador., Financiador(es): Universidade de Kyushu - Cooperação.

• 2010 - Atual

  Development of polymer bearings, Descrição: Radial and thrust ball bearings made of high carbon bearing steels, carburized steels, ceramics and plastics are commonly used as important components in various types of industrial machinery. Usage of self- lubricated polymers is progressively increasing due to the latest demands for lightweight vehicle parts working under non-lubricated conditions, easily maintainable medical machinery parts and food processing machine components. Tribological performance of polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE) and polyphenylene sulphide (PPS) has been researched extensively in the recent years and according to the results PEEK is a promising polymer for the production of precision-machined custom bearings expected to suit special market needs. Due to its self-lubrication ability, high impact durability, high corrosion resistance, low specific gravity, high melting and glass transition temperatures, PEEK is considered a high performance polymer material. It has higher fatigue strength and load capacity than PPS and a lower specific gravity than PTFE. The basic research on PEEK?s plastic tribology is extensive and various studies have been also conducted to characterize its practical application. For radial bearings, we study the rolling contact fatigue behaviour of PEEK bearing under dry conditions. Under low (<80N) and high (>100N) radial loads bearings failed by adhesion and seizure, respectively. Under medium loads however, the components achieved relatively long lives, as well as a unique feature of self-lubrication. We established an optimum load range to assure the longest possible service life of PEEK bearing elements. For thrust bearings, we are studying the wear resistance of PTFE, PEEK and hybrid (PEEK races + PTFE retainer) at loads as high as 2100 N. The influence of machining conditions and roughness on the lifetime of the bearings if of great importance in this research. The bearings are being characterized by FT-IR, FEG-SEM, EDS. , Situação: Em andamento; Natureza: Pesquisa. , Alunos envolvidos: Graduação: (1) / Mestrado acadêmico: (1) / Doutorado: (1) . , Integrantes: Edson Costa Santos - Integrante / Katsuyuki Kida - Coordenador., Financiador(es): Strategic Fundamental Technologies Strengthening Assistance Program - Cooperação.

• 2009 - 2010

  Development of refinement method of high-carbon steels, Descrição: Fatigue strength improvement by induction heating and repeated quenching - induction heating has become widely available as an alternative to furnace heating for thermal processing of several materials, in particular steel parts. Most steels with the carbon content higher than 0.3% (wt %) are suitable candidates for hardening by induction heating. Compared to conventional gas furnace heating treatment, this process offers several advantages such as fast heating rates, low energy consumption, and cost saving. The fast heating rates result in structure refinement and better mechanical properties. Unconventional heat treatment based on temperature cycling is known to reduce prior austenite grain size (PAGS) in case of gas furnace treatment; however there is little research about the effect of repeated induction heating and quenching. Three types of specimens were prepared for this study: annealed and processed by induction heating once (HT1), twice (HT2) and thrice (HT3). In each of the fatigue specimens a stress concentrator (a slit of 0.8 mm length, 0.5 mm depth and 0.2 mm radius) was milled. The samples were mechanically polished before testing. The rotating bending machine was designed in-house to test large samples. X-ray diffraction was used to measure the amount of retained austenite and residual stress before the rotating bending tests. The martensite structure was also observed by electron backscatter diffraction using a NordlysF Oxford detector in a JEOL FEG-SEM. The test results showed that repeated induction heating and quenching applied to AISI E52100 shafts decreased the prior austenite grain size and consquently refined the martensitic structure of the samples. This, along with the and higher content of retained austenite after quenching thrice increased the fatigue strength of the material.. , Situação: Concluído; Natureza: Pesquisa. , Alunos envolvidos: Graduação: (1) / Mestrado acadêmico: (1) / Doutorado: (2) . , Integrantes: Edson Costa Santos - Integrante / Katsuyuki Kida - Coordenador., Financiador(es): Strategic Fundamental Technologies Strengthening Assistance Program - Cooperação.

• 2009 - Atual

  Improvement of wear resistance of titanium bearings, Descrição: Despite very good biocompatibility, high strength to weight ratio and corrosion resistance, the tribological properties of titanium are inferior to those of other metal alloys, such as steel. Fretting and wear related aspects become important issues when titanium is used in rolling contact applications. Titanium bearings are employed in applications requiring high strength, light weight, and reduced maintenance (for example: aerospace and defense industries). A Q-sw laser was used to coat titanium bearings with TiN and TiO2 in a closed chamber in nitrogen and oxygen atmosphere, respectively. The samples were tested under water by using a thrust-type rolling contact fatigue machine. The microstructure, morphology and crystallographic texture of the laser produced layers (coatings) onto pure Ti and Ti64 are being investigated by laser confocal microscope, scanning electron microscope, electron backscatter diffraction and X-ray diffraction. The wear loss of the laser processed samples was 72-fold lower for the TiN- and almost 20-fold lower for the TiO2 coats compared to the non-coated bearings. The load carrying capacity was increased 3-fold with the TiO2 coatings. At the moment complex TiN + TiO2 + TiCO gradient bearings are being produced by treatment in nitrogen, air and carbon dioxide atmospheres.. , Situação: Em andamento; Natureza: Pesquisa. , Integrantes: Edson Costa Santos - Coordenador / Katsuyuki Kida - Integrante / Kashima, Y. - Integrante., Financiador(es): Kashima bearings corporation - Cooperação.

• 2008 - 2010

  Microstructure aspects of crack initiation and propagation of high strength bearing steel using scanning hall probe microscopy, Descrição: This is a Japanese "National project" funded by "The Japan Research and Development Centre for Metals" (JRCM) participating 15 universities, 3 national laboratories and 4 steel companies. The project objective was to investigate rolling contact fatigue of bearing steel by Scanning Hall Probe Microscopy (SHPM) and my task was to perform microstructure observation and mechanical properties evaluation of ?carburized low carbon? and ?tempered high carbon? high strength bearing steels. During this work, I have developed a new cyclic heat treatment for high carbon steel that allowed reducing prior austenite grain size and consequently: refining the martensitic structure. Bearings produced from the heat treated steel showed higher wear resistance and longer fatigue life. The method was patented. Also, during my work in Kyushu University a new device for a more systematic evaluation of crack initiation and propagation during rolling contact fatigue was developed. One of the main problems in this research area is the reliable characterization of crack initiation and propagation. By using a single ball machine developed and patented by our group, it is now possible to observe very early stages of cracking. The main objective of the work based on the cracking mechanism observation is to propose a new life prediction method for bearing steel. This new approach will help establish a new strength (life) evaluation method as well as improve bearing products and processes. Moreover, the mechanism-based quantification of fatigue-damage processes will allow the tailor made optimization and adaptation of new materials and processing routes.. , Situação: Concluído; Natureza: Pesquisa. , Alunos envolvidos: Graduação: (40) / Mestrado acadêmico: (10) / Mestrado profissional: (2) / Doutorado: (7) . , Integrantes: Edson Costa Santos - Integrante / Katsuyuki Kida - Coordenador., Financiador(es): New Energy and Industrial Technology Development Organization - Auxílio financeiro.

Prêmios