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试验钢经过真空感应炉模拟冶炼、试验测定、金相观察和理论分析,系统研究了稀土在高碳钢中的赋存状态和存量的变化规律及其对钢中硫化物夹杂、微观组织及性能的影响。研究发现,加入大量的稀土并不能无限制地增加高碳钢中固溶稀土含量,在现有试验条件下固溶稀土含量均保持在0.0011%(质量分数,下同)以下。少量的固溶稀土可以改变高碳钢珠光体形貌、细化奥氏体晶粒和珠光体片层结构。在本试验条件下,高碳钢的稀土最佳加入量为0.030%～0.035%,此时高碳钢的组织和性能得到显著改善。
Experimental steel vacuum smelting furnace simulation smelting, test determination, metallographic observation and theoretical analysis, the system of rare earth in high carbon steel in the state of occurrence and stock changes and its sulfide in steel inclusions, microstructure and properties Impact. The study found that the addition of a large amount of rare earth does not increase the RE content of high carbon steel indefinitely. Under the existing experimental conditions, the content of RE remained below 0.0011% (mass fraction). A small amount of RE can change the morphology of high carbon steel pearlite and refine the austenite grain and pearlite sheet structure. Under the test conditions, the optimum amount of rare earth for high-carbon steel is 0.030% -0.035%, the microstructure and properties of high-carbon steel are significantly improved.