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研究了淬火温度对含铝Si-Mn-Cr系超高碳钢的组织与力学性能的影响。结果表明,Al的添加可抑制钢中网状碳化物的形成,钢的相变临界温度Ac1提高到了800℃左右。随淬火温度的提高,组织有粗化的倾向,片状马氏体形态更加明显,850℃淬火后获得细小的马氏体组织;残余奥氏体含量有所增加,最高达到6.5%;钢的硬度逐渐下降,冲击韧度变化不大,抗冲击磨料磨损性能降低。850℃淬火,200℃回火后钢的硬度可达62 HRC,冲击韧度为6 J/cm2,且抗磨料磨损性能最好。
The effect of quenching temperature on microstructure and mechanical properties of Al-containing Si-Mn-Cr ultra-high carbon steel was investigated. The results show that the addition of Al can restrain the formation of carbides in the steel, and the critical temperature Ac1 of the steel increases to about 800 ℃. With the increase of quenching temperature, the microstructure tends to be roughened. The shape of lamellar martensite is more obvious. After quenching at 850 ° C, fine martensite is obtained; the retained austenite content increases up to 6.5% Hardness gradually decreased, little change in impact toughness, abrasion resistance of impact abrasives decreased. 850 ℃ quenching, tempering at 200 ℃ after the hardness of steel up to 62 HRC, impact toughness of 6 J / cm2, and wear-resistant abrasive wear the best.