高温渗氮工艺对高氮无镍不锈钢组织及力学性能的影响  

Effects of high temperature nitriding on microstructure and mechanical properties of high nitrogen nickel-free stainless steel

作　　者：王耘涛[1,2] 任伊宾[2] 杨柯[2] 张育增[3] 

机构地区：[1]内蒙古民族大学机械工程学院,内蒙古通辽028042 [2]中国科学院金属研究所,辽宁沈阳110016 [3]沈阳理工大学机械工程学院,辽宁沈阳110168

出　　处：《金属热处理》2012年第5期98-102,共5页Heat Treatment of Metals

摘　　要：采用高温渗氮在奥氏体/铁素体双相不锈钢表面形成了奥氏体高氮层。试验结果表明,渗氮层氮含量可达1.0%,与原材料相比氮含量增加了2倍。原始双相组织已经转变为奥氏体,渗氮层深度达到2 mm以上。采用合理优化的高温渗氮工艺,可在提高不锈钢强度、硬度的同时,其伸长率、断面收缩率仍然保持较高的水平。高温渗氮工艺制备高氮无镍不锈钢的最佳工艺参数为:加热温度1200℃、氮气压力0.3 MPa、保温时间24 h。High temperature nitriding is an effective method to generate high nitrogen austenite layer on surface of austenite/ferrite duplex stainless steels. The results show that the nitrogen content reaches above 1.0%, which increased 2 times compared with that of the original material. The single austenite stainless steel can be obtained, the nitrided layer depth approximately above 2 mm. The tensile strength of the nitrided specimen is higher than that of the original specimen, while the elongation and reduction of area are not obviously reduced, still keep in a high level. The best process parameters of high temperature nitriding are heating temperature 1200 ℃, nitrogen pressure 0.3 MPa and holding time 24 h.

关 键 词：高温渗氮 无镍不锈钢 氮含量 显微组织 力学性能 

分 类 号：TG156.82[金属学及工艺—热处理]