Abstract: The wear properties and wear surface morphology of three kinds of plastic die steel STAVAX (0.37C, 13.40Cr,0.31V), M330 (0.36C,12.88Cr,0.15Mo) and N702 (0.05C,16.30Cr,4.00Cu,4.00Ni,0.34Nb)with excellent corrosion resistance have been studied by M200 ring-block wear testing machine and scanning clectron micro-scope.Results showed that HRC value of quenched and tempered STAVAX,M330 and N702 steel was respectively 55,53 and 44,and width of wear coat was respectively 2.61 mm,2.74 mm and 7.4l mm; structure of STAVAX steel and M330 steel was matrix + fine spherical carbide and had higher wear resistance,while the matrix of N702 steel was relatively soft and there wasn't second phase - carbide precipitation which had lower wearing resistance,during testing the matrix was easily worm to form a lot of fatigue crack led to block and lamella weaing off.

Key words: Corrosion Resistant Plastic Die Steel, Carbide, Surface Hardness, Wear Resistance

摘要： 通过M200环-块磨损试验机和扫描电镜研究了具有良好耐腐蚀性能的3种塑料模具钢STAVAX (%:0.37C、13.40Cr、0.31V)、M330(%:0.36C、12.88Cr、0.15Mo)和N702(%:0.05C、16.30Cr、4.00Cu、4.00Ni、0.34Nb)的磨损性能和磨损表面形貌。结果表明,STAVAX、M330和N702钢在淬、回火后HRC值分别为55、53和44,磨痕宽度分别为2.61 mm、2.74 mm和7.41 mm。STAVAX和M330钢组织为基体+细球状碳化物,具有较高的耐磨性,而N702钢的基体相对较软,无第二相碳化物,在试验过程中其基体极易磨损,形成大量疲劳裂纹,易导致块状或片状剥落,耐磨性较低。

关键词: 耐蚀塑料模具钢, 碳化物, 表面硬度, 耐磨性