深冷处理对CrWMn合金钢微观组织和性能的影响  

Effect of Cryogenic Treatment on Microstructure and Properties of CrWMn Alloy Steel

作　　者：彭维祥 施琴[1] 董金泽 李长生[1] PENG Weixiang;SHI Qin;DONG Jinze;LI Changsheng(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学材料科学与工程学院

出　　处：《热加工工艺》2018年第20期206-209,共4页Hot Working Technology

基　　金：国家自然科学基金面上项目(1601220043)

摘　　要：研究了CrWMn合金钢在不同的深冷处理时间下的机械和摩擦行为。采用X射线衍射仪、MH-5维氏硬度计、MFT-5000摩擦试验机、扫描电镜、能谱分析仪考察了不同深冷处理时间对试样微观组织和耐磨损性能的影响。结果表明：相比于常规热处理,深冷处理可以使组织内部分残余奥氏体转变为马氏体,并且在马氏体间弥散析出细小的颗粒状碳化物。经过24 h深冷处理后,Cr WMn合金钢的硬度达到907.1 HV,比未深冷处理提升9.8%;磨损率在垂直载荷200 N,线速度8 mm/s时为18.6×10^-6 mm^3/J,比未深冷处理耐磨损性能提升5.3%,表现出较好的耐磨损性能。Mechanical and frictional behaviors of CrWMn alloy steel for different cryogenic treatment time were studied.The effects of the different cryogenic treatment time on the microstructure and wear resistance of the specimens were investigated by using X-ray diffraction, MH-5 Vickers hardness tester, MFT-5000 friction test machine, scanning electron microscope（SEM） and energy spectrum analyzer. The results show that： compared with conventional heat treatment, the cryogenic treatment can make the part residual austenite in the microstructure transform into martensite, and the dispersion of granular carbides precipitates between martensites. After cryogenic treatment for 24 h, the hardness of Cr WMn alloy steel reaches 907.1 HV, which increases 9.8% compared with that of non-cryogenic treatment; when the vertical load is 200 N and the line speed is 8 mm/s, the rate of wear is 18.6×10^-6 mm^3/J, and the wear resistance increases 5.3% compared with that of non-cryogenic treatment, which shows good wear resistance.

关 键 词：CrWMn合金钢 深冷处理 组织 磨损率 磨损机理 

分 类 号：TG156.91[金属学及工艺—热处理] TG161[金属学及工艺—金属学]