【摘要】 在不同温度下，采用高温摩擦磨损试验机对不同Nb含量的H13热作模具钢进行了摩擦磨损试验，利用扫描电镜(SEM)、显微硬度计、白光干涉仪、背散射电子衍射和能谱仪等研究了试验钢的磨损表面及截面形貌和硬度，并分析了Nb含量对试验钢高温磨损性能及磨损机制的影响。结果表明：相同试验温度下，随Nb含量增加，试验钢的摩擦系数降低，在500℃时达到最低值；随Nb含量的增加，试验钢磨损率逐渐降低，耐磨性逐渐提高。Nb的加入对试验钢表面软化层的硬度下降有一定抑制作用，对氧化层的支撑作用增强，氧化层剥落机率降低，耐磨性提高。不同Nb含量的H13钢的磨损机理主要是氧化磨损。更多还原

【Abstract】 The friction and wear tests of H13 hot work die steel with different Nb contents were carried out at different temperatures using a high-temperature friction and wear testing machine. The wear surface, cross section morphology and hardness of the experimental steels were studied by means of scanning electron microscopy(SEM), microhardness tester, white light interferometer, electron backscatter diffraction(EBSD) technique and energy dispersive spectroscopy(EDS) analysis, and the influence of Nb content on the high-temperature wear performance and wear mechanism of the experimental steels was analyzed.The results show that at the same test temperature, with the increase of Nb content, the friction coefficient of the experimental steels decreases, reaching its lowest value at 500 ℃. With the increase of Nb content, the wear rate of the experimental steels gradually decreases and the wear resistance gradually improves. The addition of Nb has a certain inhibitory effect on the hardness decrease of the softened layer on the surface of the experimental steels, enhances the support effect on the oxide layer, reduces the probability of oxide layer peeling, and improves the wear resistance. The wear mechanism of the H13 steel with different Nb contents is mainly oxidation wear.更多还原