摘要
采用Bruker UMT-3型高温摩擦磨损试验机对含0.37%C、4.30%Mo、1.70%W、0.96%Cr,、0.10%Si和0.15%Mn(质量分数)的新型钼钨热作模具钢在400、500、600和700℃进行摩擦磨损试验,以探究模具钢的高温摩擦磨损机制。结果表明:随着试验温度的提高,钢的摩擦氧化层增厚,摩擦因数减小;试验钢摩擦磨损试验后的磨损率按试验温度700、600、400和500℃的顺序递减;在400和500℃摩擦磨损试验时,影响钢的磨损率的主要因素是试验过程中产生的摩擦氧化层的厚度;600℃试验时,钢的耐磨性受表层硬度和摩擦氧化层厚度的影响;700℃试验时,钢的表层硬度是影响耐磨性的主要因素。试验钢的高温摩擦磨损机制包含氧化磨损、粘着磨损和磨粒磨损。
A new type of molybdenum-tungsten hot work die steel,containing 0.37%C,4.30%Mo,1.70%W,0.96%Cr,0.10%Si,and 0.15%Mn by mass,was subjected to friction-wear tests at 400,500,600,and 700℃in a Bruker UMT-3 high-temperature friction-wear tester,to explore the high-temperature friction-wear mechanism of the die steel.The results showed that(a)as the test temperature increased,the steel increased in tribo-oxide layer thickness and decreased in friction coefficient;(b)wear rate of the investigated steel after friction-wear tests decreased in the order of the test temperatures such as 700,600,400,and 500℃;(c)main factor influencing wear rate of the steel was thickness of tribo-oxide layer produced during friction-wear tests at 400 and 500℃;(d)wear resistance of the steel was affected by both the case hardness and the tribo-oxide layer thickness during test at 600℃;and(e)wear resistance of the steel was largely affected by the case hardness during test at 700℃.The high-temperature friction-wear mechanism of the investigated steel involved oxidative wear,adhesive wear and abrasive wear.
作者
李爽
张伦
吴晓春
LI Shuang;ZHANG Lun;WU Xiaochun(Hebei Vocational University of Indurstry and Technology, Shijiazhuang Hebei 050092, China;School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China)
出处
《上海金属》
CAS
2021年第5期56-61,共6页
Shanghai Metals
基金
河北工业职业技术学院博士基金项目(No.BZ201801)
河北省教育厅青年基金项目(No.QN2020257)
河北省教育厅大中学生科技创新能力培育专项项目(No.2021H011004)。
关键词
模具钢
高温磨损
磨损机制
摩擦氧化物
die steel
high-temperature wear
wear mechanism
tribo-oxide
