Darlan Dias Coelho

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Projetos de pesquisa

• 2015 - 2015

  Solubilização de carbonitretos de nióbio em aços de baixo, médio e alto teor de carbono: uma aplicação., Descrição: O trabalho explora a solubilização dos carbonitretos de nióbio em aços extra baixo, baixo, médio e alto teor de carbono a fim de definir a equação mais adequada para encontrar a temperatura de solubilização para cada condição de diferentes combinações de teores de nitrogênio (0,002, 0,010 e 0,020%), carbono (0,05, 0,10, 0,50 e 1,00%) e nióbio (0,02, 0,04 e 0,06%) nos aços. Conhecimentos adquiridos: ? Aços microligados, ? Refino de grãos ? Solubilidade, ? Elementos intersticiais ? Thermocalc® software. , Situação: Concluído; Natureza: Pesquisa. , Alunos envolvidos: Graduação: (2) . , Integrantes: Darlan Dias Coelho - Coordenador / Manuela Souza Lima Borges - Integrante / Roney Eduardo Lino - Integrante.

• 2014 - 2015

  Crystallographic Texture stability during phase transformation of two phase Ti alloys, Descrição: Understanding of the macrozone, primary alpha (αp) and secondary alpha (αs) phase morphology and the selection of their crystallographic orientations and the corresponding local and global texture changes is crucial for better performance of Ti alloys. In addition the role of high temperature β orientations on the macrozone formation and the selection of α orientations, particularly αp orientations are unknown in α+β Ti alloys. Thus this work was undertaken to decipher the αp, αs and β phase texture and macrozone evolution of the α+b alloy Ti-6Al-4V during hot rolling at high α and high β field. The EBSD analysis confirms that the high temperature β orientations have a strong role on the nature of macrozones and the final texture. The high temperature β orientations were observed to be inherited from the pre-exsiting αs orientations. A strong variant selection during βα transformation was noticed with the higher extent of β deformation.. , Situação: Concluído; Natureza: Pesquisa. , Alunos envolvidos: Graduação: (1) . , Integrantes: Darlan Dias Coelho - Integrante / Leo Prakash - Coordenador.

• 2014 - 2015

  Deformation twin evolution of Ti microstructures, Descrição: Deformation twin activity has been confirmed in the case of α+β Ti alloys subjected to very high strain rate loading or cryogenic temperature deformation. In contrast, there is ambiguity regarding twin activity for moderate deformations. This issue has a strong relevance to the aero industry where fine textural control is mandatory. This work is aimed to throw light on this particular aspect and identify if twinning indeed takes place in this deformation regime. With this objective in mind, a strongly textured Ti-6Al-4V was loaded perpendicular to the

• 2014 - 2015

  Microstructural evolution of additive layer manufactured Ti-6Al-4V, Descrição: Repair of high integrity aerospace components requires detailed materials understanding and mechanical testing to quantify the influence of various processing parameters and techniques on the underlying material. An example of this is in the use of layer additive processes (such as Electron Beam Melting (EBM) etc.) using alloy powder and a laser source to melt the material and build complex structures (or repair regions of complex structures) is finding increasing use in the aerospace industry. Due to the arduous operating conditions and the safety critical nature of components being processed using layer additive techniques, it is critical that detailed understanding of the physical properties and microstructure of these structures is understood and controlled. Aero industry is applying both EBM processes and heat treatment techniques to a range of Titanium alloys in order to repair high value, high integrity aero-engine components. This project focused on the understanding of the relationship between the microstructure of layer additive Ti-64 structures and their mechanical properties. Such understanding can be linked to processing parameters in order to inform and influence the process development activities. , Situação: Concluído; Natureza: Pesquisa. , Alunos envolvidos: Graduação: (1) . , Integrantes: Darlan Dias Coelho - Integrante / Leo Prakash - Coordenador.

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