Cr15Mn18Mo2.5Nb双相钢固溶渗氮动力学  

Kinetics of solid solution nitriding for Cr15Mn18Mo2.5Nb dual-phase steel

作　　者：金松哲[1] 隋小波 刘先黎 姚军 黄岩 季长涛[1] JIN Song-zhe;SUI Xiao-bo;LIU Xian-li;YAO Jun;HUANG Yan;JI Chang-tao(School of Materials Science and Engineering,Changchun Universily of Technology,Changchun 130012,China;School of Mechanical Engineering,Jilin Engineering Normal Universily,Changchun 130052,China;Changchun HighNirogen Alloy Research and Development Center Limited Company,Changchun 130012,China)

机构地区：[1]长春工业大学材料科学与工程学院,长春130012 [2]吉林工程技术师范学院机械工程学院,长春130052 [3]吉林常春高氮合金研发中心有限公司,长春130012

出　　处：《吉林大学学报（工学版）》2020年第4期1333-1337,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51371089)。

摘　　要：采用管式气氛炉,在1100~1200℃、N2气压强为0.1 MPa、渗氮时间为8~24 h的工艺条件下,对Cr15Mn18Mo2.5Nb双相钢进行固溶渗氮处理。采用光学显微镜、显微硬度仪和X-射线衍射仪对渗氮层显微组织、厚度及物相组成进行了测试和分析。研究结果表明:Cr15Mn18Mo2.5Nb双相钢固溶渗氮前为铁素体-奥氏体双相组织,渗氮后渗层组织转变为全部奥氏体组织。在1200℃,气氛压力为0.1 MPa、渗氮时间为24 h的工艺条件下渗氮最高硬度可达312 HV,渗层厚度最高达到1.45 mm。对Cr15Mn18Mo2.5Nb钢固溶渗氮结果进行扩散动力学研究,结果表明在上述工艺条件下其固溶渗氮扩散激活能为101.54 kJ/mol。The solution nitriding treatment of Cr15Mn18Mo2.5Nb duplex steel is carried out in a tube furnace under nitrogen atmosphere(0.1 MPa) at 1100~1200 ℃ for 8~24 h. The microstructure,hardness,thickness and phase composition of the nitriding layers are measured and analyzed using optical microscope,microhardness tester and X-ray diffractometer. The results show that the ferrite-austenite duplex structure of Cr15Mn18Mo2.5Nb duplex steel could be fully changed to the austenitic structure after solid solution nitriding. The highest hardness and thickness of the nitriding layer are 312 HV and 1.45 mm respectively,at nitriding treatment of 1200℃ for 24 h. The diffusion activation energy of nitriding treatment of the Cr15Mn18Mo2.5Nb steel is 101.54 kJ/mol obtained through diffusion kinetic simulation experiments.

关 键 词：材料合成与加工工艺 Cr15Mn18Mo2.5Nb双相钢 固溶渗氮 扩散激活能 

分 类 号：TG178[金属学及工艺—金属表面处理]