针对目前微合金钢凝固过程中产生大量裂纹缺陷的现状。以B-F偏析模型为基础对微合金钢凝固过程进行了理论分析,并结合Gleeble-1500热模拟试验,系统研究了SAPH440微合金钢凝固前沿脆性区的溶质偏析及裂纹敏感性。结果表明：微合金钢凝固过程中,固相率在0.75～1.00之间时,C、Mn元素偏析较轻,S、P、Ti元素偏析严重,Mn对S偏析有抑制作用,Mn的质量分数增加到1.2%时,S的偏析度降低至20.7;对凝固脆性区的影响程度顺序为Mn〉S〉C〉P〉Ti,S的质量分数由0.002%增加至0.02%,凝固脆性区由25K扩大至33K;Mn的质量分数从0.2%增大到1.6%时,裂纹敏感区间由15K扩大至38K。同时Gleeble-1500热模拟试验证实钢脆化的原因与试样的凝固组织无直接关系。
Based on numerous cracks in continuous cast billets during solidification,the crack susceptibility and solute segregation was investigated by theoretical calculation and thermal simulation experiment.The results show that the solid volume fraction of microalloy steel between 0.75 and 1.00,the segregation degree of elements C,Mn is lower than S,P,Ti.While the S content raises to 1.2%,the segregation degree of element S decreases to 20.7;the influence degree of brittle zone is MnSCPTi,the brittle zone temperature enlarges from 25 K to 33 K,15 K to 38 K with the content of S,Mn increases from 0.002% to 0.02%,0.2% to 1.6%,respectively.Meanwhile,steel embitterment has no direct relation with solidification structure was confirmed by thermal simulation experiment.
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