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在UMT-3高温摩擦磨损试验机上对两种热作模具钢的高温摩擦磨损特征进行了研究,通过扫描电子显微镜(SEM)和X射线衍射仪(XRD)等检测手段对磨损表面和截面的形貌特征及物相进行分析.试验结果表明:SDCMSS钢有较H13钢高的高温耐磨性.在试验温度范围,SDCM-SS钢摩擦系数和磨损率要小于H13钢.SDCM-SS钢在400~700℃发生轻微氧化磨损机制;H13钢在400~500℃发生轻微氧化磨损机制,600和700℃发生严重氧化磨损机制.SDCM-SS钢高氧化性和高热稳定性能使新型模具钢具有较H13钢更宽的轻微氧化磨损温度区间,从而具有好的高温耐磨性能.700℃时,SDCM-SS钢的碳化物在摩擦过程中会聚集在摩擦氧化物层与基体交界面形成碳化物层.此碳化物层有益于提高热作模具钢的高温耐磨性.
The hot friction and wear characteristics of two hot work die steels were studied on the UMT-3 high temperature friction and wear tester. The wear surface and cross-section shape of the hot die steel were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD) The results show that: SDCMSS steel has a higher high temperature wear resistance than H13 steel.The friction coefficient and wear rate of SDCM-SS steel are less than that of H13 steel in the test temperature range.SDCM- ~ 700 ℃, slight oxidation and wear mechanism of H13 steel occurred at 400 ~ 500 ℃ and severe oxidative wear occurred at 600 and 700 ℃ .SDCM-SS steel high oxidation and high thermal stability of the new die steel with H13 The wider, slightly oxidized wear temperature range of the steel gives good high-temperature wear resistance. At 700 ° C, the carbides of the SDCM-SS steel accumulate at the interface of the friction oxide layer with the matrix to form a carbide layer during the friction. This carbide layer is beneficial to improve the high temperature wear resistance of hot work die steel.