对含碳量为0.5—2.69％的Fe—Cr—Mn合金在大气中进行了800℃及660℃的氧化动力学、恒温氧化以及在800℃、660℃和520℃下的高温磨粒磨损试验。观察了氧化膜的形貌、分析了试样亚表层的微区成分。结果表明:①随含碳量增加,共晶碳化物数量增加,致使参与氧化的基体组织中的锰量下降,合金的氧化抗力提高;②材料在高温下的磨损抗力与该温度下材料的硬度和共晶碳化物数量有关,硬度增加使磨损抗力增加,但碳化物的有益作用还取决于基体组织对它的支撑能力。
Kinetic and isothermal oxidation test at 800 and 660℃, and abrasive wear testat 800, 660 and 520℃ were carried out for the Fe-Cr-Mn alloys containing various contentsof C ranging from 0.50 to 2.69%. The morphology of oxidation film and microstructure ofsubsurface were examined. Results show that with increasing content of C, the amount ofeutectic carbide increases resulting decrease of Mn in matrix to participating in oxidation. Theoxidation resistace is thas improwed. The high temperature wear resistance is closely relatedto the bulk hardness and eutectic carbide contained. The higher the hardness, the better thewear resistance will be. However, the support provided by the matrix seems to be very impor-tant to ensure the wear resistant effect of the carbide.
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