热处理工艺对SKD11钢冲击磨损性能和磨损机理的影响  

Effect of heat treatment process on impact wear property and mechanism of SKD11 steel

作　　者：刘长华[1,2] 孙国栋 熊略[1] 杨先啓 LIU Chang-hua;SUN Guo-dong;XIONG Lue;YANG Xian-qi(School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005, Jiangxi, China;Surface Green Remanufacturing Engineering Technology Center of Jiangxi Province, Jiuiiang University, Jiujiang 332005, Jiangxi, China)

机构地区：[1]九江学院机械与材料工程学院,江西九江332005 [2]九江学院江西省表面绿色再制造工程技术中心,江西九江332005

出　　处：《钢铁研究学报》2018年第3期199-205,共7页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(5156050036)

摘　　要：采用金相显微镜、硬度计、冲击试验机和X射线衍射仪对比了真空淬火＋回火和真空淬火＋深冷处理＋回火2种工艺下SKD11钢的显微组织、力学性能和物相组成。采用MLD-10型动载荷磨损试验机测试了2种热处理工艺下SKD11钢的冲击磨损性能,并对冲击磨损机理进行了分析。结果表明,2种热处理工艺下的组织均由回火马氏体＋碳化物＋残余奥氏体构成,深冷处理下的硬度比真空处理下高1HRC,冲击韧性略有下降。在冲击磨损的工况下,深冷处理时试样的失重量比真空处理时的失重量低,体现出了更好的耐磨性。在所研究的磨损时间内,真空处理后试样的磨损机理为高应力表面疲劳和磨粒磨损,深冷处理后试样的磨损机理为轻微的磨粒磨损。The microstructure,mechanical property,phase of SKD11 steel after vacuum heat treatmentor deep cryogenic heat treatment were studied by means of OM,hardness tester,impact tester and XRD.The impact wear properties of SKD11 steel under the two heat treatments were tested by MLD-10 dynamic load-bearing wear tester.The impact wear mechanism was also analyzed.The results show that the microstructures of SKD11 steel after the two heat treatmentsare composed of tempering martensite,retained austenite and carbide.The hardness after cryogenic treatment is 1 HRC higher than that of the vacuum treatment and impact toughness decreases lightly.Under impact wear conditions,the weight loss of the sample during deep cryogenic treatment is lower than that of the vacuum treatment,which shows better wear resistance.In the studied wear time,the wear mechanism of the sample after vacuum treatment is high stress surface fatigue and abrasive wear,and the wear mechanism of the sample after cryogenic treatment is slight abrasive wear.

关 键 词：SKD11钢 真空处理 深冷处理 冲击磨损性能 碳化物 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG161[金属学及工艺—金属材料]