添加微细铬铁粉对烧结钢摩擦磨损性能的影响

研究了加入不同含量的微细铬铁粉对烧结钢干摩擦磨损性能的影响,并借助于扫描电镜观察分析其磨损形貌,探讨摩擦磨损机制。研究结果表明:添加微细铬铁粉可改善烧结钢的强度、硬度和摩擦磨损性能,铬的质量分数为1.5%时,耐磨性最佳。磨损造成一定厚度的塑性变形,硬度较高的材料塑性变形层较薄。磨损早期,磨粒磨损是主导机制,磨损后期,由于塑性变形导致亚表层产生裂纹,进而发生的剥层磨损是主导磨损机制。

Effects of addition of ultrafine Cr-Fe powder on tribological behavior of sintered steel

The effects of addition of ultrafine Cr-Fe powder in different contents on the tribological behavior of sintered steel were investigated.The morphology of worn surfaces and the tribological mechanism were analyzed by scanning electron microscope(SEM).The results show that addition of ultrafine Cr-Fe powder improves the strength,hardness and wear resistance of sintered steel,and the wear resistance is best at Cr content of 1.5%.The SEM observations of the worn surface revealed that wear leads to the plastic deformation in a certain depth,and the higher the hardness,the thinner the deformation layer.In the early stage of the wear process,the abrasive wear is the dominant mechanism.Later,the dominant is the delamination wear resulted from the plastic deformation and leading to the crack of the subsurface.