Hardening mechanism and thermal-solid coupling model of laminar plasma surface hardening of 65 Mn steel  

作　　者：Xiuquan CAO Lin WANG Haoming XU Guangzhong HU Chao LI 曹修全;王林;徐浩铭;胡光忠;李超(Sichuan University of Science&Engineering,Yibin 644000,People’s Republic of China;Chengdu University of Technology,Chengdu 610059,People’s Republic of China;Key Laboratory of Advanced Manufacturing Technology of Panzhihua City,Panzhihua 617000,People’s Republic of China)

机构地区：[1]Sichuan University of Science&Engineering,Yibin 644000,People’s Republic of China [2]Chengdu University of Technology,Chengdu 610059,People’s Republic of China [3]Key Laboratory of Advanced Manufacturing Technology of Panzhihua City,Panzhihua 617000,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第12期110-120,共11页等离子体科学和技术（英文版）

基　　金：appreciate the support of the Key Laboratory of Mechanical Structure Optimization&Material Application Technology of Luzhou(No.SCHYZSA-2022-02);the Scientific Research and Innovation Team Program of Sichuan University of Science and Technology(No.SUSE652A004);the Key Laboratory of Intelligent Manufacturing of Construction Machinery Project(No.IMCM202103);the Panzhihua Key Laboratory of Advanced Manufacturing Technology Open Fund Project(No.2022XJZD01)。

摘　　要：In the present work,the laminar plasma surface hardening method is employed to enhance the service life of metal components fabricated from 65 Mn steel.The mechanical and wear behaviors of the laminar plasma surface hardened 65 Mn steel were analyzed.The martensite transition transformation of the temperature of the laminar plasma-hardened 65 ferrite Mn steel was determined by a thermal-solid coupling model.Based on the orthogonal experimental results,the optimal hardening parameters were confirmed.The scanning velocity,quenching distance and arc current are 130 mm/min,50 mm and 120 A,respectively.The pearlites and ferrites are transformed into martensites in the hardened zone,while the ratio of martensite in the heataffected zone decreases with the increase in the hardening depth.Compared to the untreated 65Mn steel,the average hardness increases from 220 HV_(0.2)to 920 HV_(0.2)in the hardened zone and the corresponding absorbed power increases from 118.7 J to 175.5 J.At the same time,the average coefficient of friction(COF)decreases from 0.763 to 0.546,and the wear rate decreases from 5.39×10^(-6)mm^(3)/(N·m)to 2.95×10^(-6)mm^(3)/(N·m),indicating that the wear resistance of 65Mn steel could be significantly improved by using laminar surface hardening.With the same hardening parameters,the depth and width of the hardened zone predicted by the thermal-solid coupling model are 1.85 mm and 11.20 mm,respectively,which are in accordance with the experimental results;depth is 1.83 mm and width is 11.15 mm.In addition,the predicted hardness distributions of the simulation model are in accordance with the experimental results.These results indicate that the simulation model could effectively predict the microstructure characteristics of 65 Mn steel.

关 键 词：65 Mn steel laminar plasma surface hardening hardening mechanism microstructure characteristics thermal-solid coupling model 

分 类 号：O53[理学—等离子体物理] TG178[理学—物理]