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淬火钢件的机械性能,是由其显微组织形态决定的。讨论了淬火钢件的组织形态、晶粒、亚晶粒、残留奥氏体和过冷奥氏体分解产物对机械性能的影响。对于工业常用钢制工件,为了具有高的强韧性能,淬火时应该获得板条状(位错型)马氏体和少量分布在板条之间呈薄膜状的残留奥氏体,避免自由铁素体、珠光体和上贝氏体形成。最高的强韧性产生在含碳量稍低于0.6%的回火板条状马氏体组织的钢中。
Hardened steel mechanical properties, is determined by the morphology of its microstructure. The effects of microstructure, grain size, subgrains, retained austenite and undercooled austenite on the mechanical properties of quenched steel were discussed. For industrial common steel parts, in order to have high strength and toughness properties, it is necessary to obtain slab-like (dislocation-type) martensite and a small amount of residual austenite distributed between the slats during quenching to avoid free iron Prime, pearlite and upper bainite. The highest toughness results from tempered lath martensitic steel with carbon contents of slightly less than 0.6%.