摘要
为了研究新型热冲压模具材料SDCM钢的高温摩擦磨损性能,对比国外优质热作模具材料CR7V钢,利用扫描电子显微镜（SEM）,透射电子显微镜（TEM）,X射线衍射分析（XRD）,UMT-3型高温摩擦磨损试验机以及Bruker白光轮廓仪等手段研究了新型热冲压模具钢SDCM热处理后组织状态、抗氧化性能以及不同温度高温摩擦磨损后磨痕形貌、截面形貌、表面物相.结果表明：不同温度下SDCM钢磨损机制差异明显,100℃时,材料主要为黏着磨损,经过300℃、500℃轻微氧化磨损与黏着磨损共存的阶段后,700℃时,磨损机制转变为氧化磨损;在100～400℃范围内,CR7V由于含有更多的M23C6型和M7C3型碳化物（分别占总碳化物的3.4%和12.7%）,因而具有较高的耐磨性;500～700℃范围内,SDCM因具有更高的抗回火软化能力;同时Cr元素含量较少,抗氧化能力较弱,能够及时形成摩擦氧化层,作为＂润滑剂＂,提高材料的耐磨性.
The high temperature friction and wear properties of a new kind of hot stamping die material, SDCM steel, were investigated on a UMT-3 high temperature friction and wear tester using a high quality hot work die material, CR7V steel, as a benchmark. The microstructure and oxidation resistance of SDCM after heat treatment, morphologies and composition of the worn surface and cross-sectioned worn surface at eldevatd temperature were determined by using scanning electron microscope, transmission electron microscopy, X-ray diffraction analysis, Bruker white light scanning profiler. Results indicate that wear mechanisms of SDCM steel were different at elevated temperature. Adhesive wear dominated at 100 ℃. Mild oxidation wear and adhesive wear were observed at 300 ℃ and 500 ℃. The dominate wear mechanism was oxidation wear at 700℃. At temperatures from 100℃ to 400℃, CR7V exhibited high wear resistance due to the presence ofM23C6 and M7C3 carbide, which were for 3.4% and 12.7% of the total carbide, respectively. From 500℃ to 700 ℃, SDCM had high resistance to temper softening. In addition, it had poor resistance to oxidation because of the low quantity of Cr. As the result, the tribo-oxide layer on the worn surface acted as a ＂lubricant＂ and responsible for the high wear resistance of material at 700℃.
作者
陈士浩
李爽
吴晓春
CHEN Shihao, LI Shuang WU Xiaochun(State Key Laboratory of Advanced Special Steel, Shanghai 200072, China Shanghai Key Laboratory of Advaneed Ferrometallurgy, Shanghai 200072, China School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China)
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2016年第5期538-545,共8页
Tribology
关键词
热冲压模具钢
高温摩擦磨损性能
碳化物
高温氧化
hot stamping tool steel
high temperature friction and wear properties
carbides
high temperature oxidation
