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在对析出相行为进行试验研究的基础上,结合铸坯热应力变化与组织演变分析讨论了微合金钢红送裂纹的形成机制。结果表明:铸坯输送方式的不同以及装炉温度的变化对装炉时铸坯中析出相的行为具有显著影响,但不同输送方式以及不同装炉温度条件下再加热结束后的铸坯中析出相的存在状态较为相似;微合金钢红送裂纹是在析出相行为、组织演变和热应力变化三者的共同作用下形成的,其中起主导作用的是铸坯组织的演变,即两相区中奥氏体晶界先共析铁素体网膜的生成。
Based on the experimental study of the precipitated phase behavior and the analysis of the thermal stress and microstructure evolution of the billet, the formation mechanism of red sent crack in the microalloyed steel was discussed. The results show that the different conveying modes of slab and the change of charging temperature have a significant influence on the behavior of precipitated phase in slab during charging, but the slab is precipitated in different conveying modes and slab reheating after different heating temperatures The existence of phases is similar. The micro-alloyed steel red crack is formed by the combination of precipitation phase behavior, microstructure evolution and thermal stress. The dominant one is the evolution of the slab structure, namely, the two-phase zone Formation of pro-eutectoid ferritic omentum in austenite grain boundaries.