Análise da difusão do manganês em um par de difusão composto por um aço baixo carbono e um aço com alto teor de manganês (27%) após processo de conformação a quente

• Autor(a) principal: Moura, Isaque Alan de Brito
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/39009
• topic: Aço alto manganês; TWIP; Forjamento; Título

The steel industry has carried out major studies aimed at the development of advanced high strength steels, providing solutions and methods, in partnership with several sectors, among them the automotive sector, to use these steels, mainly in structural projects. The focus of these projects is aimed at meeting the environmental requirements, and in the case of use in the automobile, the safety of passengers in eventual collisions. The parts that ensure the physical integrity of the passengers in a side event of collision or rollover of the automobile must be manufactured with steels of high mechanical resistance. Steel with high energy absorption capacity is used in parts involved in front and rear collisions. TWIP (Twinning Induced Plasticity) steel is a high mechanical strength steel combined with high deformation capacity. The structure of this steel is of the austenitic type and is maintained during the whole process of plastic deformation, and the mechanism responsible for the great deformation capacity is the intense formation of maclas inside the grains. The maclas generate a refinement in the microstructure, functioning as contours of grain and acting as barriers for the disagreements. In this way, the material presents high total elongation, good mechanical resistance and great capacity of energy absorption. The name TWIP is related to the mechanism used in these steels to increase plasticity induced by the formation of maclas, that is, Twinning Induced Plasticity. This mechanism differs from the so-called Transformation Induced Plasticity (TRIP) effect, where the increase in plasticity is achieved not by the formation of maclas but by the transformation of the austenite into the martensite induced by the deformation. The chemical composition of this type of steel is characterized by high Mn content (20-35% by mass). Both microstructures presented coarse grains due to the forging process employed. Fe27Mn1Si alloy manganese was diffused into the low carbon steel, even though it only occurred in a layer that did not exceed microns.