对热锻模具用钢5CrMnMo进行亚温淬火试验研究:通过拉伸、冲击、硬度、疲劳等试验与常规淬火相比,这些性能不但不降低,反而有提高;对经渗硫软氮化处理的试样,又进行亚温淬火复合热处理。通过磨损试验表明,耐磨性有很大改善。最后通过金相、电子探针及断口扫描电镜分析,认为亚温淬火之所以能够提高钢的强韧性,其主要原因是由于在钢中保留一部分铁素体和晶粒细化的作用。 The sub-temperature quenching test of steel 5CrMnMo for hot forging die was carried out. Compared with the conventional quenching, the properties of the die for hot forging die quenching were not reduced, but increased. The tests of soft nitriding Sample, but also sub-temperature quenching composite heat treatment. Through the wear test showed that wear resistance has greatly improved. Finally, metallographic, electron probe and fracture scanning electron microscopy analysis show that the reason why sub-temperature quenching can improve the toughness of steel is mainly due to the retention of some ferrite and grain refinement in the steel.