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为了揭示0.1%C-5%Mn钢的板坯内部裂纹的产生机理,采用物理测试、金相分析和设计热模拟试验等方法,研究了不同冷却模式下钢的组织及裂纹特征。结果表明,高的冷却强度下铸坯内部出现了大量的马氏体和裂纹,冷却强度越大马氏体相越多,裂纹宽度越大。采用缓冷或热送的工艺能够防止快速冷却引起的马氏体相变,形成粒状贝氏体组织,由此可以控制内部裂纹的产生和扩展。
In order to reveal the mechanism of internal cracks in 0.1% C-5% Mn steel, the microstructure and crack characteristics of steel under different cooling modes were studied by means of physical test, metallographic analysis and thermal simulation test. The results show that a large amount of martensite and cracks appear in the slab under high cooling strength. The larger the cooling intensity, the larger the martensite phase and the larger the crack width. Adopting slow cooling or hot feeding can prevent martensite transformation caused by rapid cooling and form granular bainite structure, thereby controlling the generation and expansion of internal cracks.