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观察了35SiMnCrMoV钢中、低等温转变组织的显微特征。实验结果表明下贝氏体、下贝氏体/马氏体和马氏体三种组织的强度不同,但均有相当好的韧性。330℃等温下的下贝氏体/马氏体混合组织具有较佳的综合性能,这是由于它有各向分布、小尺寸的板条马氏体束,而且板条边界上有较多的残余奥氏体存在,以及在贝氏体的铁素体内碳化物均匀分布。因此选用合适的等温淬火工艺是提高35SiMnCrMoV钢强度韧性的一条有效途径。
The microstructures of the 35SiMnCrMoV steels with low-temperature transformation were observed. The experimental results show that the strength of lower bainite, lower bainite / martensite and martensite are different, but all have good toughness. The lower bainite / martensite mixed microstructure at 330 ℃ is preferred because of its uniformly distributed, small-sized lath martensite beam with more Retained austenite is present as well as the homogenous distribution of carbides in the bainite ferrite. Therefore, the selection of suitable isothermal quenching process is to improve the strength and toughness of 35SiMnCrMoV steel an effective way.