18Cr2Ni4WA钢渗碳后的环保型热处理  

Environmentally friendly heat treatment of 18Cr2Ni4WA steel after carburizing

作　　者：王新宇[1] 杨立新 刘艳梅[1] 刘刚 康冲 颜廷宇 Wang Xinyu;Yang Lixin;Liu Yanmei;Liu Gang;Kang Chong;Yan Tingyu(Shenyang Aircraft Corporation,Shenyang Liaoning 110034,China)

机构地区：[1]沈阳飞机工业(集团)有限公司,辽宁沈阳110034

出　　处：《金属热处理》2024年第11期272-277,共6页Heat Treatment of Metals

摘　　要：针对现有浴炉复合等温淬火工艺的高污染、高能耗问题,提出了真空淬火、分级淬火、气氛炉复合等温淬火3种替代工艺,对比分析了18Cr2Ni4WA钢渗碳后,经3种工艺淬火+深冷+回火处理后的渗碳层和心部的显微组织、硬度和力学性能。结果表明,3种淬火方案处理18Cr2Ni4WA钢的渗碳层组织均以回火马氏体为主,但心部组织不同。真空淬火和分级淬火工艺下,心部组织为回火马氏体,复合等温淬火工艺下的心部组织为回火索氏体,因此真空淬火和分级淬火下硬度、抗拉强度更高,而复合等温淬火工艺下塑韧性更好。3种替代工艺处理18Cr2Ni4WA钢的各性能指标均能满足应用指标要求,且均未使用高污染高能耗的碱槽设备,可实现渗碳后绿色热处理的目标。To address the issues of high pollution and high energy consumption in the current isothermal quenching process in bath furnaces,three alternative processes(vacuum quenching,step quenching and atmospheric furnace composite isothermal quenching)for 18Cr2Ni4WA steel were investigated.The microstructure,hardness and mechanical properties of the carburized layer and core of the tested steel were comparatively analyzed after carburizing and undergoing three kinds of quenching,deep cooling and tempering.The results indicate that the carburized layer microstructure of the 18Cr2Ni4WA steel treated with three quenching schemes is mainly tempered martensite,but the core microstructure is different.Under vacuum quenching and step quenching processes,the core structure is tempered martensite,while under composite isothermal quenching process,the core structure is tempered martensite.Consequently,under vacuum quenching and step quenching,the hardness and tensile strength are higher,while under composite isothermal quenching process,the plasticity and toughness are better.The performance indicators of the 18Cr2Ni4WA steel treated by three alternative processes can all meet the application requirements,but not using high-pollution and high-energy consumption alkali tank equipment,which can achieve the goal of green heat treatment after carburizing.

关 键 词：18CR2NI4WA钢 显微组织 复合等温淬火 真空淬火 分级淬火 力学性能 

分 类 号：TG156.81[金属学及工艺—热处理]