表面软氮化处理对SKD61热作模具钢热熔损性及热疲劳性能的影响  

Effect of Surface Soft Nitriding Treatment on Hot Melt Loss and Thermal Fatigue Properties of SKD61 Hot Work Die Steel

作　　者：郑旭阳[1] 吴芮[1] 章勐 叶鑫[1] 

机构地区：[1]武汉理工大学能源与动力工程学院,湖北武汉430063

出　　处：《热加工工艺》2016年第14期161-164,共4页Hot Working Technology

基　　金：国家级创新创业训练基金项目(20151049705068);武汉理工大学自主创新基金项目(2015-ND-A1-13);武汉理工大学2016国家级大学生创新创业训练计划(20161049705016)

摘　　要：对日本常用的热作模具钢SKD61(相当于H13钢)进行气体软氮化处理,研究氮化处理对热作模具钢微观组织、热熔损性能及热疲劳性能的影响。试验选用传统型A及低Si高Mo含量的改良型B热作模具钢为研究材料,进行热处理研究。结果表明:两种热作模具钢经气淬及回火处理后,组织均为回火马氏体。氮化处理试片表面主要为Fe_3N与Fe_4N相,且在525℃回火处理后有二次硬化现象。改良型钢种比传统型更能抗铝熔损,且经580℃软氮化处理80 min后,能有效降低熔损率。B钢的抗疲劳性优于A钢,但软氮化处理并不能有效提升耐热疲劳性。Gas soft nitriding treatment was carried on common hot work die steel SKD61 （equivalent to H13 steel）, which was used in Japan. The effects of nitriding treatment on the microstructure, hot melt loss property and thermal fatigue property of hot work die steel were studied. Taking traditional type （A） and modified low Si and high Mo content （B） hot die steel as research material, the heat treatment research were carried out. The results show that the microstructure of the two hot work die steels after gas quenching and tempering treatment are tempered martensite and the microstructure of the surface of nitriding test piece is predominantly Fe3N and Fe4N phase, and after tempering at 525℃, the secondary hardening phenomenon appears. The modified steel has more resistant aluminium melting loss than the traditional type. After soft nitriding treatment at 580 ℃ for 80 min, the melting loss rate effectively reduces. The anti-fatigue property of B steel is superior to that of the traditional type （A） steel, but the soft nitriding treatment cannot effectively improve the thermal fatigue resistance.

关 键 词：热作模具钢 软氮化处理 热熔损 热疲劳 微观组织 

分 类 号：TG179[金属学及工艺—金属表面处理]