【摘要】 利用 MPX- 2 0 0 0型主轴盘销式磨损试验机和扫描电子显微镜 ( SEM)研究了团球 γ+ ( Fe,Mn) 3 C共晶体增强奥氏体钢基自生复合材料 ( EAMC)在干摩擦磨损工况下的滑动磨损特征 .试验表明 ,EAMC的磨损过程存在跑合与稳态磨损 2个阶段 ,跑合阶段中主要发生奥氏体基体的强烈塑性变形与流动 ,稳态磨损阶段中的磨损机制主要为剥层磨损 .团球共晶体作为主要的承载物体承受摩擦磨损作用 ,推迟位错集中区的形成和磨粒在对偶件上的积聚 ,能有效地减小 EAMC磨屑的形成和脱落 ,降低 EAMC的磨损量 ,提高 EAMC向严重磨损转变的临界载荷 .修正了颗粒增强复合材料向严重磨损转变的临界载荷判据 ,采用该判据所确定的 EAMC临界载荷与实验结果吻合更多还原

【Abstract】 Based on pin-on disc dry sliding tests and scanning electron microscopy （SEM） observation, the sliding wear behaviors of granular γ+（Fe, Mn）₃C eutectics reinforced austenite matrix composites （abbreviated EAMC） under dry wear condition were studied. The wear testing shows that the wear process of EAMC can be divided into running-in and steady state regimes. The serious plastic deformation and flow occur to austenite matrix of EAMC in the running-in regime. The dominant wear mechanism of EAMC is the delamination wear at the steady state regime. The γ+（Fe, Mn）₃C eutectic particles, as the main body against the normal load and abrasive wear, can delay the formation of dislocation depleted zone and accumulation of abrasive on the counterpart surfaces. Therefore, the probability of the debris formation and flaked decreases, which results in the decrement of wear rate for EAMC and the increment of critical normal load above which severe wear occurs to EAMC. The criterion on the critical normal load for particulate reinforced composites was revised. The calculated results agree well with the experimental ones for EAMC.更多还原