离子渗氮SDDM钢模具耐磨性的试验与数值研究  

Experimental and Numerical Study on Wear Resistance of Ion Nitrided SDDM Steel Die

作　　者：杨子帅 吴博雅 李奇颖 黎军顽[1,2] YANG Zishuai;WU Boya;LI Qiying;LI Junwan(School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444

出　　处：《上海金属》2022年第4期23-28,共6页Shanghai Metals

基　　金：国家重点研发计划(2016YFB0300400,2016YFB0300404)。

摘　　要：研究了SDDM热锻模具钢离子渗氮后的组织、力学性能和高温摩擦磨损特性。基于高温摩擦磨损试验建立了Archard磨损模型,并通过数值模拟研究了离子渗氮对SDDM钢汽车前轴热锻模磨损的影响。结果表明:SDDM钢离子渗氮层的氮化物为ε-Fe3N和γ′-Fe4N,表面硬度达到了935 HV0.2,厚度约200μm;离子渗氮后SDDM钢的摩擦因数和磨损率均下降,在300和400℃时发生磨粒磨损,500℃时发生黏着磨损;连续锻造15件汽车前轴后,未渗氮的SDDM钢模具的最大磨损深度达4.43×10-4 mm,而经离子渗氮的SDDM钢模具的最大磨损深度仅为2.57×10-4 mm,下降了约42%。Microstructure,mechanical property and high temperature friction-wear behavior of SDDM hot forging die steel after ion nitriding were studied.According to the high temperature friction-wear test,the Archard wear model was established,and the influence of ion nitriding on wear of the SDDM steel die used for hot forging automobile front axle was investigated by numerical simulation.The results showed that(a)the ion nitrided layer of SDDM steel exhibited nitrides such asε-Fe3N andγ′-Fe4N,surface hardness as high as 935 HV0.2,and thickness of about 200μm;(b)after ion-nitriding,the SDDM steel decreased in both friction coefficient and wear rate,and suffered from abrasive wear at 300 and 400°C and adhesive wear at 500℃;(c)after continuously forging 15 pieces of front axle,the maximum wear depths were 4.43×10-4 mm for the SDDM steel die not ion-nitrided and as little as 2.57×10-4 mm for the SDDM steel die ion-nitrided,namely the latter was about 42%less than the former.

关 键 词：SDDM热锻模具钢 磨损 离子渗氮 数值模拟 

分 类 号：TG156.82[金属学及工艺—热处理]