精铸热锻模具钢的合金成分设计及其高温磨损性能研究  

Alloying Design and High-temperature Wear Property of Cast Hot-forging Die Steel

作　　者：王树奇[1] 崔向红[2] 陈康敏[1] 姜启川[2] 洪扁[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]吉林大学材料科学与工程学院,吉林长春130025

出　　处：《摩擦学学报》2006年第4期382-386,共5页Tribology

基　　金：国家计委产业化前期关键技术与成套设备研制开发项目资助(1999317);江苏高校省级重点实验室开放课题项目(kjsmcx04004)

摘　　要：探讨了精铸热锻模具钢合金化设计的依据和合金成分设计较佳的参数范围，开发出高耐磨精铸热锻模具钢，烈用MG-2000型销．盘式高温摩擦磨损试验机在干摩擦、400℃条件下，研究了精铸热锻模具钢的高温磨损性能．结果裂明：合金成分设计参数应控制为V／C在3．00～3．60之间，C余在0．10～0．25之间，Cr／Cr＋Mo在0．68～0．85之间，Cr／C余〉16．60，Mo／C余〉16．00；所研制的精铸热锻模具钢的淬火组织为马贝复相组织，回火后碳化物以弥散析出V4C3为主，含有少量Cr和Mo的碳化物，Cr、Mo主要固溶于α-Fe中，以保证精铸热锻模具钢的热强性和热稳定性；梢铸模具钢具有较好的高温耐磨性，磨损率明显低于H13钢．其磨损机制为氧化磨损，即在精铸热锻模具钢的高温磨损表面形成Fe3O4和Fe2O3。Principle of alloying design and optimum range of alloying-design parameters for the cast hot-forging die steel are discussed, and a high wear-resistant cast die steel was developed. Thermal wear test was carried out on an MG-2000 type pin-on-disk high-temperature wear tester. The test condition was dry friction, 400 ℃ for temperature, 100 N for load, 2m/s for sliding speed, 1.8 ×10^3 m for total sliding distance. Wear of cast hot-forging die steel at high temperature was studied. Results show that the quenching structure of the cast steel is martensite and banite. After tempering, dominant carbides are dispersed V4C3 with a little of carbides of Cr or Mo. Cr and Mo mainly solutionize in α-Fe in the cast die steel. Parameters of alloying design for the cast hot-forging die steel are controlled in terms of V/C 3.0 - 3.6, Cre 0. 1 - 0. 25 , Cr/Cr ＋ Mo 0. 68 - 0. 85, Cr/Cre 〉 16.6, Mo/Cre 〉 16. Fe3O4 and Fe2O3 are formed on worn surface, thus the wear mechanism is typically oxidation wear. The cast hotforging die steel has higher high-temperature wear resistance with evident lower wear rate than H13 steel.

关 键 词：铸钢 热锻模具 高温磨损性能 合金成分设计 

分 类 号：TH117.3[机械工程—机械设计及理论]