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Strengthening 42CrMo4 steel by isothermal transformation below martensite start temperature

机译：在马氏体开始温度以下通过等温转变来强化42CrMo4钢

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摘要

Ultrahigh-strength low alloy 42CrMo4 steels, widely used in the automobile industry, were heat treated by two different cycles, namely: conventional austempering above the martensite start temperature M_s and low-temperature isothermal transformation below M_s, 604 K (331 ℃). Metallurgical and mechanical properties of the heat-treated alloys were investigated carefully by various analysation techniques. The results of tensile testing indicated that the proof strength and ultimate tensile strength could be significantly improved by isothermal transformation below M_s at 583 K (310 ℃) for 3.6 ks without degrading the ductility. The ultrafine-grainedanostructured mixed lower bainite/martensite microstructure created by quenching and partitioning martensite, and the unique fracture morphology were found to be responsible for this improvement. To further confirm the experimental results, a micromechanical model was employed to analyse the strengthening mechanisms.
机译：在汽车工业中广泛使用的超高强度低合金42CrMo4钢通过两个不同的循环进行热处理，即：在马氏体起始温度M_s以上进行常规奥氏体淬火，在M_s以下进行604 K（331℃）以下的低温等温转变。通过各种分析技术仔细研究了热处理合金的冶金和机械性能。拉伸试验的结果表明，在583 K（310℃）下M_s下进行3.6 ks的等温转变可以显着提高屈服强度和极限拉伸强度，而不会降低塑性。通过淬火和分配马氏体而形成的超细晶粒/纳米结构的下贝氏体/马氏体混合显微组织，以及独特的断裂形态被认为是造成这种改善的原因。为了进一步证实实验结果，采用了微机械模型来分析强化机理。

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