18Cr2Ni4WA钢衬套的精密气体渗碳淬火热处理  

Precise gas carburizing quenching process of 18Cr2Ni4WA steel bushes

作　　者：李锋[1] 王新宇[2] 李世键[2] 韩培培[2] 于浩[2] 

机构地区：[1]中国人民解放军驻沈阳飞机工业(集团)有限公司军事代表室,辽宁沈阳110034 [2]沈阳飞机工业(集团)有限公司,辽宁沈阳110034

出　　处：《金属热处理》2016年第4期154-157,共4页Heat Treatment of Metals

摘　　要：研究了精密气体渗碳等温淬火工艺对18Cr2Ni4WA钢渗层硬度、深度及显微组织的影响。结果表明,随着总渗碳保温时间的延长,渗层深度增加,但硬度曲线变得平缓;在相同总保温时间的情况下,强渗时间越长,渗层越深;而当扩散时间相同时,强渗时间越长,淬火后表层的硬度较低。优化的精密气体渗碳工艺为:保温温度均为910℃,强渗阶段碳势1.20%,保温3 h;扩散阶段碳势0.80%,保温1 h,渗碳后进行等温淬火,可以获得(1.2±0.1)mm渗层深度。渗碳淬火后渗层组织良好。该工艺成功应用于衬套零件的实际生产,满足了设计要求。The influence of precise gas carburizing and isothermal quenching process on carburized layer hardness, depth and the microstructure of 18Cr2Ni4 WA steel was studied. The results show that the carburized layer depth increases with the increasing of the total holding time,but the hardness profile becomes flat gradually. The longer of strong carburizing time,the deeper of carburized depth with the same total holding time. The longer of strong carburizing time,the lower of surface hardness with the same diffusion carburizing time. The optimized precise heat treatment process consists of holding temperature at 910 ℃,by carbon potential of strong carburizing stage at 1. 20%and holding for 3 h,and then by carbon potential of diffusion stage at 0. 80% and holding for 1 h,and then isothermally quenched in nitrate bath. With this optimized process,the typical carburized depth of（ 1. 2 ± 0. 1） mm with favorable microstructure distribution is obtained.The process has been successfully applied in bushes production with satisfactory requirement of carburized depth,hardness profile and microstructure.

关 键 词：精密气体渗碳 18CR2NI4WA钢 渗层深度 扩散渗 

分 类 号：TG156.8[金属学及工艺—热处理]