Rolling friction and wear behaviours of a surface densified Fe-2Cu-0.6C powder metallurgy material were investigated. Results indicated that friction coefficient and wear were significantly decreased after rolling. Wear rate tended to be steady as the rolling cycle increases. Under light load, wear was caused by delamination and ploughing. Delamination crack initiated on material surface. Under heavy load, wear was caused by delamination and pits. Cracks initiated at the surface and subsurface. However, due to the hardened surface layer and a lower porosity, probability of subsurface crack initiation was reduced and crack locations were closer to surface. Crack propagation distance also was shortened. The surface densified layer plays an important role in improving the rolling wear resistance of the material.

中文翻译：

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表面致密粉末冶金Fe-2Cu-0.6C材料的滚动摩擦磨损性能研究

研究了表面致密的Fe-2Cu-0.6C粉末冶金材料的滚动摩擦和磨损行为。结果表明，轧制后摩擦系数和磨损显着降低。随着轧制周期的增加，磨损率趋于稳定。在轻载下，磨损是由分层和耕作引起的。材料表面开始出现分层裂纹。在高负荷下，磨损是由分层和凹坑引起的。在表面和次表面产生裂纹。然而，由于硬化的表面层和较低的孔隙率，降低了地下裂纹萌生的可能性，并且裂纹位置更靠近表面。裂纹扩展距离也缩短了。表面致密层在改善材料的滚动耐磨性中起重要作用。