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本文介绍一种含碳量为2.0%,含铬量为30.0%的铸造耐热耐磨合金材料。由于合金含有较高的铬和碳,在凝固过程中,形成一种致密、坚硬耐磨性好的铬碳化物(Cr_7C_3)耐磨质点,它比铁碳化物(Fe_3C)的硬度和韧性要优越得多。采用光学显微镜,扫描电子显微镜及X光衍射研究了合金的显微组织、碳化物形态及分布。合金的组织是由γ-Fe固溶体、碳化物及少量α铁素体组成。经相组成分析和Quantimet-720图象分析仪,测定γ-Fe固溶体量为70%,碳化物量为20%,α铁素体量为10%。碳化物形态有共晶花样型和块状二种,牢牢地银嵌在γ-Fe固溶体内。因此合金既有良好的耐磨性、韧性、又有好的机械加工性能。在不同磨损条件下对比了合金的抗磨损特性,并采用扫描电镜分析了合金的磨损情况。该合金采用感应熔炼,精密铸造成型。合金耐磨性能好,有良好的高温性能,在实际生产中使用,收到显著的经济效果。
This article describes a carbon content of 2.0%, chromium content of 30.0% of the cast heat-resistant wear-resistant alloy material. As the alloy contains higher chromium and carbon, a compact, hard and wear-resistant chromium carbide (Cr_7C_3) wear resistant particle is formed during solidification, which is superior to the hardness and toughness of iron carbide (Fe_3C) Much more. The microstructure and carbide morphology and distribution of the alloy were studied by optical microscope, scanning electron microscopy and X-ray diffraction. The alloy is composed of γ-Fe solid solution, carbides and a small amount of α-ferrite. After the phase composition analysis and Quantimet-720 image analyzer, the amount of γ-Fe solid solution was 70%, the amount of carbides was 20% and the amount of α-ferrite was 10%. Carbide morphology eutectic patterns and massive two species, firmly embedded in silver solid solution γ-Fe. Therefore, the alloy has good wear resistance, toughness, but also good machinability. The wear resistance of the alloy was compared under different wear conditions, and the wear status of the alloy was analyzed by SEM. The alloy induction melting, precision casting molding. Alloy wear resistance, good high temperature performance, used in actual production, received significant economic results.