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研究了等温转变温度对75Si2CrMn钢无碳化物贝氏体组织形态及其对力学性能的影响。结果表明,在280～330℃范围内的转变产物为薄膜状奥氏体与细片状贝氏铁素体的细小层片状双相组织。它同时具有很高的屈服强度、韧性和加工硬化能力。而转变温度由330℃提高到350℃后,转变产物则为粗大贝氏铁素体团块,分布于奥氏体基体中的双相组织。同时,其力学性能,尤其是韧性发生突然下跌。因此,若获得综合力学性能优异的组织,则等温淬火温度不能高于330℃。
The effect of isothermal transformation temperature on the structure of carbides bainite of 75Si2CrMn steel and its effect on mechanical properties were investigated. The results show that the transformation product in the range of 280-330 ℃ is a thin lamellar double-phase structure of film-like austenite and fine-grain bainitic ferrite. It also has high yield strength, toughness and work hardening ability. When the transformation temperature is increased from 330 ℃ to 350 ℃, the transformation product is coarse bainitic ferrite billet distributed in the austenite matrix. At the same time, its mechanical properties, especially the sudden drop in toughness. Therefore, if you get excellent mechanical properties of the organization, the austempering temperature can not be higher than 330 ℃.