关键词: 材料合成与加工工艺, 微细铬铁粉, 铁基预合金粉末, 干摩擦磨损, 磨损机制

Abstract:

     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.

Key words: materials synthesis and processing technology, ultrafine CrFe powder,  iron base prealloy powder, dry friction wear, wear mechanism