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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2019.tde-20032020-085144
Document
Author
Full name
Marcelli Susaki Dias
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2019
Supervisor
Committee
Monlevade, Eduardo Franco de (President)
Lima, Nelson Batista de
Prados, Erika Fernanda
Title in Portuguese
Estudo comparativo de textura cristalográfica de tubos de cobre sem costura obtidos por laminação planetária.
Keywords in Portuguese
Cobre
Laminação
Ligas metálicas
Recristalização
Textura
Tubos
Abstract in Portuguese
No presente trabalho, analisa-se a textura cristalográfica de tubos de cobre da liga 12200 obtidos via laminação planetária. Dois materiais de partida diferentes foram utilizados para laminação, sendo: tubo fundido continuamente e tubo extrudado. Além de catalogar as texturas obtidas pelo processo, avalia-se a possibilidade de que diferentes materiais de partida possam gerar diferentes padrões de textura. Neste caso, a textura serviria como critério comparativo que pode ser relacionado posteriormente com a homogeneidade das propriedades relacionadas a ela, como o Módulo de Young. Foram realizadas análises de microtextura (EBSD) e macrotextura (difração de raios-x com goniômetro de textura) em amostras devidamente preparadas das superfícies externa, de meia espessura e interna. Diferenças entre as texturas obtidas por cada técnica de análise foram observadas. Também foi observada a variação da textura ao longo da espessura, sugerindo que devido à geometria do processo de laminação as camadas sofreram recristalização dinâmica em momentos e circunstâncias diferentes. Verificou-se a necessidade de analisar os dados obtidos por um software que não force simetria. Foi encontrada a textura clássica do tipo cubo em todas as amostras analisadas, caracterizando a textura de recristalização. Conclui-se que a textura de recristalização nesse processo é independente do material de partida.
Title in English
Comparative study od crystallographic texture of seamless copper tubes obtained by planetary rolling.
Keywords in English
Copper alloys
Planetary rolling
Recrystallization
Seamless tubes
Texture
Abstract in English
In the present work, the crystallographic texture of 12200 copper alloy tubes obtained by planetary rolling was analyzed. Two different starting materials were used for rolling: continuously cast tube and extruded tube. In addition to cataloging the textures obtained by the process, the possibility that different starting materials may generate different texture patterns was evaluated. In this case, the texture would serve as a comparative standard that may be further related to the homogeneity of properties related to it, such as Young Modulus. Microtexture (EBSD) and macrotexture (x-ray diffraction with texture goniometer) analyzes were performed on properly prepared samples of the external surfaces, the half-thickness surface of the tube and the internal surface. Differences between the textures obtained by each analysis technique were observed. Texture variation along the thickness of the tube was also observed, suggesting that due to the geometry of the rolling process the layers underwent dynamic recrystallization at different times and circumstances. It was necessary to analyze the data by a different software that does not force symmetry. The classic cube-like texture was found in all samples analyzed, featuring the recrystallization texture. It is concluded that the recrystallization texture in this process is independent of the starting material.
 
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Publishing Date
2020-05-29
 
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