5CrMnMo钢复合热处理的研究

Compound Heat Treatment of 5CrMnMo Steel

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。

An investigation of hardening process in critical range using 5CrMnMo steel for hot-forging dies is presented. The property testing shows that tensile strength, toughness, hardness and fatigue strength of 5CrMnMo steel hardened in critical range are higher than that in common temperature above Ac3. In addition, the abrasion resistance of 5CrMnMo steel is improved hardened in critical range after low-temperature sulphurizing-carbonitriding. It is considered that the main cause of improving properties in the effects of residual ferrites and finer grains.