CARACTERIZAÇÃO DAS PROPRIEDADES MECÂNICAS DO AÇO SAE 4140 APÓS DIFERENTES TRATAMENTOS DE TÊMPERA E REVENIDO / CARACTHERIZATION OF MECHANICAL PROPERTIES ON SAE 4140 STEEL AFTER DIFFERENT TREATMENTS OF QUENCHING AND TEMPERING

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The high strength and low alloy steels (HSLA) belong to a class of steels in which researchers of the metal-mechanic area have particular interest. The aim of this work is to verify the influence of quenching and tempering heat treatments on the properties of the SAE 4140 steel as well as to evaluate its behaviour when subjected to tempering in a temperature range associated with the material´s embrittlement. At first, the material was heat treated according with different quenching and tempering conditions. In the sequence, specimens machined from the treated material were subjected to tensile and impact energy tests and characterized by microstructural and fractographic analysis. The results showed that the mechanical properties of the material were influenced by the tempering parameters, specially temperature and time of treatment as well as the permanence time of the specimens in the furnace before cooling.

ASSUNTO(S)

microestrutura impact energy energia de impacto fragilizacao no revenido microstructure tempering embrittlement

ACESSO AO ARTIGO

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