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本文研究了马氏体,贝氏体、残余奥氏体及马氏体—贝氏体混合组织在二体、三体磨料磨损下的磨损特性,对材料磨损表面及磨屑形貌进行了详细分析。结果表明,材料的磨料磨损主要由显微切削和显微裂纹两个因素控制,材料的耐磨性由其强度与韧性的配合所决定。马氏体组织的加工硬化速率及碳含量强烈影响其耐磨性,先转变少量下贝氏体对其耐磨性有益。下贝氏体组织在高应力磨料磨损下比相同硬度,或稍高硬度的回火马氏体组织具有较高的耐磨性,但在低应力磨损下表现为不利的作用。粗大的贝氏铁素体组织在两种磨损下都对耐磨性不利。马氏体—贝氏体混合组织比马氏体组织,贝氏体组织具有更高的耐磨性。残余奥氏体在二体高应力磨损下起非常有益的作用,在三体低应力磨损下则起不利的作用。
In this paper, the wear characteristics of martensite, bainite, retained austenite and martensite-bainite mixed microstructure under two-body and three-body abrasive wear were studied. The wear surface and wear debris morphology of the material were detailed analysis. The results show that the abrasive wear of the material is mainly controlled by two factors of micro-cutting and microcracking. The wear resistance of the material is determined by the combination of its strength and toughness. The work-hardening rate and carbon content of martensite strongly affect its wear resistance. It is beneficial to first change the lower bainite to its wear resistance. The lower bainite has a higher wear resistance than the tempered martensite with the same or slightly higher hardness under high stress abrasive wear but appears to be detrimental in low stress wear. The coarse bainitic ferrite structure is not good for abrasion resistance under both kinds of wear. Martensite - bainite mixed tissue than the martensite, bainitic tissue has a higher wear resistance. Residual austenite plays a very beneficial role in the high body stress of two bodies and plays an adverse role in the low body stress of three bodies.