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以添加La、Ce混合稀土的20MnCrNi2Mo耐磨铸钢为研究对象,采用德国产的L78 RITA淬火热膨胀仪,结合金相观察与硬度分析,测定了其静态CCT曲线,根据测得的CCT曲线,分析并阐明了冷却速度与组织演变、硬度变化的关系。结果表明,试验钢的静态CCT曲线只有贝氏体转变区和马氏体转变区,且贝氏体转变区延伸的范围较宽,其临界冷却速度为4℃/s,淬透性较好,这主要取决于合金元素与固溶稀土的综合作用。研究结果既能够为稀土在耐磨铸钢中应用的理论研究提供有用的实验数据,又能够为生产实践提供参考依据。
Taking 20MnCrNi2Mo wear-resistant cast steel with mixed rare earth La and Ce as the research object, the static CCT curve was measured by L78 RITA quenching and dilatometer made in Germany, with the metallographic observation and hardness analysis. According to the measured CCT curve, The relationship between cooling rate and microstructure evolution and hardness was also clarified. The results show that the static CCT curve of the test steel has only bainite transformation zone and martensite transformation zone, and the bainite transformation zone has a wide range of extension, the critical cooling rate is 4 ℃ / s, the hardenability is good, This depends mainly on the combined effect of alloying elements and dissolved rare earths. The results can not only provide useful experimental data for the theoretical study of rare earth in wear-resistant cast steel, but also provide a reference for production practice.