高耐磨冷作模具钢的热处理工艺研究

Heat treatment process for a type of cold working die steel of high wear resistance

在实验电阻炉中对一种高耐磨冷作模具钢进行热处理工艺试验,通过金相显微镜观察、洛氏硬度测定和失重法耐磨性分析,研究热处理工艺对材料碳化物组织、硬度和耐磨性的影响。试验结果表明,采用980℃和1020℃淬火热处理工艺均能使试验钢获得良好的组织和较高的硬度,最佳热处理工艺为980℃淬火+180℃×2次回火,最佳工艺下的试验模具钢比Cr12MoV模具钢磨损量减小两倍以上。

Heat treatment experiment was carried out of a type of cold working die steel of high wear resistance in the experimental resistance furnace to investigate the effect of heat treatment process on carbide structure, hardness, and wear resistance. Metallurgical microscope was used to reveal the steel＇s microstructure, Rockwell hardness tester to determine its hardness, and the weight loss meth- od to evaluate its wear resistance. The results show that, quenching hot treatment at 980℃ or 1020 ℃ can both yield good microstructure and high hardness and the best hot treatment process consists of quenching at 980 ℃ and tempering twice at 180℃. The die steel having gone through the best treat- ment process sees a reduction in wear extent two times smaller than Cr12MoV working die steel.