采用金相显微镜、扫描电镜、图像分析仪及温度记录仪分析、测试、研究了不同稀土加入量对4137H合金钢纯净度、过冷度、组织和力学性能的影响.结果表明:稀土夹杂物以Ca,Al高熔点氧化物为核心聚集长大.加入适量稀土后,4137H合金钢内夹杂物减少,纯净度提高,过冷度增加,组织得到细化.当稀土加入量为1%时,过冷度增加26 K,常温抗拉强度和硬度分别提高了14%和32%.
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