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生产中许多构件需要同时具备高强度和高塑性,而碳钢中的马氏体或贝氏体组织中保留部分残余奥氏体能得到高强度与高塑性的配合。对三种常规碳钢进行了相变处理,利用光学金相、透射电镜(TEM)、扫描电镜(SEM)观察,以及拉伸、弯曲等试验方法,研究了热处理对这三种碳钢的组织和力学性能的影响,并对其组织与性能关系进行了讨论。结果发现:化学成分为0.32%C、1.5%Mn和0.35%Si的碳钢在860℃奥氏体化后进行420℃等温处理,能够获得这种复相组织,满足构件的性能要求。
Many components in production require both high strength and high ductility, while the retained austenite in the martensitic or bainitic structure of the carbon steel provides a combination of high strength and high ductility. The phase transformation of the three kinds of conventional carbon steels was carried out. The microstructure of the three kinds of carbon steels was studied by means of optical metallography, transmission electron microscopy (TEM), scanning electron microscopy (SEM) observation, tensile test and bending test. And mechanical properties, and the relationship between the organization and performance were discussed. The results show that the carbon steel with chemical composition of 0.32% C, 1.5% Mn and 0.35% Si can be obtained after being austenitized at 860 ℃ and isothermally treated at 420 ℃, which can meet the performance requirements of components.