热处理对烧结低密度钢组织与性能的影响

Effect of Heat Treatment on Microstructure and Properties of Sintered Low-density Steel

采用放电等离子烧结制备低密度钢试样,并对烧结试样进行固溶和时效热处理,对比分析热处理前后烧结试样的致密度及显微组织,研究热处理对烧结低密度钢组织和力学性能的影响。结果表明:烧结低密度钢显微组织为铁素体+奥氏体,孔隙处存在C元素富集且热处理后孔隙处C含量高;烧结试样热处理后,其抗拉强度由403 MPa提高到584 MPa,显微硬度由518 HV提高到541 HV;热处理前后烧结试样的稳定阶段摩擦系数无明显差异。

Low-density steel samples were prepared by spark plasma sintering, and the sintered samples were subjected to solution heat treatment and aging heat treatment. Through the comparative analysis of the density and microstructure the sintered samples before and after heat treatment, the effect of heat treatment on the microstructure and mechanical properties of sintered low-density steel was studied. The results show that the microstructure of sintered low-density steel is ferrite + austenite, the pores are enriched with C element and the C content in the pores after heat treatment is high;After heat treatment, the tensile strength increases from 403 MPa to 584 MPa and the microhardness increases from 518 HV to 541 HV. There is no significant difference in the friction coefficient of the sintered samples before and after heat treatment.