Analise microestrutural e das propriedades mecanicas de forjados em aço microligados obtidos a partir de pre-formas CWR

AUTOR(ES)

Mario Luiz Nunes da Silva

DATA DE PUBLICAÇÃO

2004

RESUMO

The advantages of metal forming, consisting of high productivity, low costs per part, minimum scrap material and energy consumption and improvement of overall quality, stimulate the increase of their application. Cross Wedge Rolling (CWR) is an important metal forming technique used to manufacture stepped shafts. The aims of this work were: (i) to analyze how CWR affects the microstructure and the mechanical properties, especially the mechanical fatigue related ones, of microalloyed steel hot forged products and (ii) to compare the microstructure and properties of these products with similar forgings, manufactured by the conventional process of successive hot forging stages. To design the CWR tools, it was considered the conditions described in the technical literature that would guarantee the process stability, avoiding the defects. It proved not to be enough and some parts showed central cavities. Continuing the work, the parts were hot forged and then analyzed. The results showed that the defects were not detected by metallography and they did not have influence in the final properties of the forged parts. In general way, the parts manufactured from CWR preforms presented higher tensile strength and hardness than the only forged parts and lower yield strength and fatigue resistance

ASSUNTO(S)

conformação de metais microestrutura forjamento

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