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使用粉末冶金技术在1150℃烧结制备了不同致密度的高铬铸铁。对其进行900℃×3 h空冷+100℃×1 h回火的热处理,对经热处理后的高铬铸铁显微组织和耐磨性能进行了研究。结果表明:热处理后的合金致密度增大,因孔隙引起的应力集中减小,结果是冲击韧性与压溃强度增高,耐磨性能变好;热处理后,烧结高铬铸铁获得了马氏体、残余奥氏体和碳化物组织;由于基体脆性增加,冲击韧性和压溃强度降低,但硬度增加导致耐磨性提高。
High-chromium cast iron with different densities was prepared by powder metallurgy sintering at 1150 ℃. The microstructure and wear resistance of the high chromium cast iron after heat treatment were investigated by heat treatment at 900 ℃ × 3 h air cooling + 100 ℃ × 1 h tempering. The results show that the density of the alloy after heat treatment increases, the stress concentration decreases due to the pores, the result is that the impact toughness and crush strength increase, and the wear resistance becomes better. After the heat treatment, the martensite, Retained austenite and carbides; impact strength and crush strength decrease due to increased matrix brittleness, but increased hardness results in increased wear resistance.