用金相显微镜、扫描电镜和能谱仪分析了某钢厂Q345B钢板坯角部横裂纹的特征和成因.结果表明:裂纹是由沿奥氏体晶界析出的MnS复合析出物和先共析铁素体膜造成的.铸坯凝固过程中,微细硫化锰沿奥氏体晶界析出,当铸坯表面温度降低到奥氏体向铁素体转变温度范围时,微细硫化物促进膜状先共析铁素体的形成,受到矫直应力作用时,应力主要集中在膜状铁素体相上,并在硫化物周围形成微孔,微孔聚合导致裂纹的形成.
参考文献
| [1] | Barrie MINTZ .The Influence of Composition on the Hat Ductility of Steels and to the Problem of Transverse Cracking[J].ISIJ International,1999(9):833-855. |
| [2] | Zarandi F;Yue S.Failure mode analysis and a mechanism for hot-ductility improvement in the Nb-microalloyed steel[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2004(35):3823-3841. |
| [3] | Harada S;Tanaka S;Misumi H et al.A formation mechanism of transverse cracks on CC slab surface[J].ISIJ International,1990,30(04):310-316. |
| [4] | Dippenaar R;Moon S C;Szekeres E S .Strand surface crakes:the role of abnormal large prior-austenite grains[J].Iron & Steel Technology,2007,4:105-115. |
| [5] | 孙彦辉,赵长亮,蔡开科,杨素波,陈永,李桂军,顾武安.连铸板坯表层网状裂纹的成因研究[J].中国冶金,2008(04):15-20. |
| [6] | Mintz, B .Understanding the low temperature end of the hot ductility trough in steels[J].Materials Science and Technology,2008(1):112-120. |
| [7] | Maehara Y;Yasumtot K;Sugitani Y.Effect of carbon on hot ductility of as-cast low alloy steel[J].Testsu to Hagane,1985(11):1534-1541. |
| [8] | Takamura J;Mizoguchi S.Roles of oxides in steels performance[A].Nagoya,ISIJ,1990:591-596. |
| [9] | 刘新宇,许中波,王新华,杜德信,赵克文,伍兵.含钒微合金钢连铸坯高温塑性的研究[J].钢铁,2000(01):51-54. |
| [10] | Turkdogan E T;Ignatowicz S;Pearson J .The solubility of sulphur in iron and iron-manganese alloys[J].Iron Steel Inst,1955,180:349-354. |
| [11] | Narita K .Physical chemistry of the groups Ⅳa (Ti,Zr),Ⅴa (V,Nb,Ta) and the rare earth elements in steel[J].Transactions of the Iron and Steel Institute of Japan,1975,15:145-152. |
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