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采用金属模具浇注新型ZG20CrSiMn槽帮低碳耐磨铸钢,研究了亚温淬火热处理(QLT)和深冷处理(DCT)复合热处理对其显微组织、力学性能和耐磨损性能的影响。结果表明,与常规调质(QT)、QT+DCT及QLT工艺相比,复合热处理(QLT+DCT)工艺可以显著提高ZG20CrSiMn钢的抗拉强度、韧性以及抗磨损性能。经QLT+DCT工艺处理后的ZG20CrSiMn钢,具有良好的抗拉强度及韧性,这与层片状的细小回火索氏体组织和一定比例的铁素体有关。与QT+DCT工艺处理样品对比,QLT+DCT工艺处理样品具有更好的耐磨损性能。
A new ZG20CrSiMn grooved low-carbon wear-resistant cast steel was cast with a metal mold. The effects of sub-temperature quenching heat treatment (QLT) and cryogenic treatment (DCT) composite heat treatment on the microstructure, mechanical properties and wear resistance were studied. The results show that the composite heat treatment (QLT + DCT) process can significantly improve the tensile strength, toughness and wear resistance of ZG20CrSiMn steel compared with conventional quenching (QT), QT + DCT and QLT processes. The ZG20CrSiMn steel treated by QLT + DCT process has good tensile strength and toughness, which is related to lamellar fine tempered sorbite and a certain proportion of ferrite. Compared with QT + DCT process samples, QLT + DCT process samples have better wear resistance.