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为了改善叶片用高铬铸铁的耐磨性,对其热处理工艺进行研究。结果表明:960℃×2 h淬火空冷+250℃×2 h回火、1050℃×2 h淬火空冷+450℃×2 h回火这两种工艺热处理后的叶片铸铁可获得细小弥散分布的共晶碳化物+二次碳化物+回火马氏体基体,以及少量的残余奥氏体组织。经过这两种工艺热处理后,叶片铸态共晶碳化物体积分数分别减少至26.67%和25.62%,碳化物形态和分布得到改善,硬度分别提高至62.60 HRC和62.10 HRC,叶片的耐磨性分别提高了42.24%和34.64%。
In order to improve the wear resistance of the blades with high chromium cast iron, the heat treatment process is studied. The results showed that the fine castings of the cast iron after heat treatment at 960 ℃ × 2 h quenching air cooling + 250 ℃ × 2 h tempering, 1050 ℃ × 2 h quenching air cooling + 450 ℃ × 2 h tempering were obtained Crystalline carbide + secondary carbide + tempered martensite matrix, and a small amount of retained austenite. After the heat treatment of these two processes, the volume fraction of as-cast eutectic carbide in the blade decreased to 26.67% and 25.62%, respectively. The carbide morphology and distribution were improved, and the hardness increased to 62.60 and 62.10 HRC respectively. Increased by 42.24% and 34.64%.