基于水基淬火介质的42CrMo偏航齿圈的热处理工艺

Heat treatment process of 42CrMo yaw gear ring based on water-based quenching medium

针对淬火油污染严重、生产不安全因素等问题,介绍一种新型水基淬火介质,及替代传统油淬的工艺。利用光学显微镜、洛氏硬度计、万能试验机和冲击试验机等手段对不同规格的42CrMo钢在无机高分子水基淬火液中淬火再高温回火后的组织及性能进行了研究,并分析了用无机高分子水溶性淬火介质替代淬火油的可能性。结果表明,42CrMo钢在淬火后的硬度值为55~56 HRC;回火后的硬度值为285 HBW;显微组织主要为粒状索氏体。其抗拉强度、屈服强度、伸长率、断面收缩率等力学性能均达到大型合金钢锻件的JB/T6396技术条件要求。因此,改进后的热处理工艺可以更好地应用于42CrMo钢的淬火,显著提高了偏航齿圈综合热处理质量。

According to the heavily polluted and unsafe factors in production of quenching oil,this paper introduces a new type of waterbased quenching medium to replace the conventional process of oil quenching,which is in order to replace the traditional oil quenching process.The microstructure and mechanical properties of 42 CrMo steel quenched in inorganic polymer water-based quenching bath,and then tempering at high temperature were studied by means of optical microscope,Rockwell hardness tester,universal testing machine and impact testing machine.The results show that the hardness values of 42 CrMo steel are 55-56 HRC after quenching,the hardness values after tempering is 285 HBW.The microstructure is mainly granular sorbite.The tensile strength,yield strength,elongation,section shrinkage and other mechanical properties of 42 CrMo steel can meet the technical requirements of JB/T 6396 for large alloy steel forgings.Therefore,the improved heat treatment process can be better applied to 42 CrMo steel quenching,which significantly improving the comprehensive heat treatment quality of yaw ring gear.