含锡不锈钢溶质偏析模型计算

结合微观偏析模型及Thermo-calc软件,考虑了Mn S的析出,用微观偏析理论研究了含锡铁素体不锈钢中溶质的偏析行为.主要讨论了铁素体不锈钢中C,Mn,S,P,Cr在凝固过程中的偏析程度,研究了溶质偏析对零强度温度(ZST)、零塑形温度(ZDT)的影响规律.分析了锡在铁素体钢和低碳钢中偏析行为的差异,解释了低碳钢的热加工塑形凹槽现象,理论分析了微量元素对热塑性的影响.结果表明,Sn的凝固偏析比远大于除P,S外的其他元素,Mn对S元素凝固偏析有抑制作用.锡为易偏析元素,其在奥氏体相中的凝固偏析比大于在铁素体相中的偏析比.

Micro-segregation of Solutes in Tin-Containing Ferritic Stainless Steel

Combined a micro-segregation model with Thermao-calc software， the segregation condition of tin-containing ferritic stainless steel was studied in which the precipitation of MnS was considered. The effects of C， Mn， S， P， and Cr on the interdendritic segregation， zero strength temperature (ZST)， and zero ductility temperature (ZDT) of steel were discussed. The segregation of tin in ferritic steel and low-carbon steel was analyzed， the plastic trough phenomenon in the hot-working process of low-carbon steel was explained and the improvement of plasticity by adding tin was studied. The results showed that the segregation ratio of Sn is much higher than that of other elements except for P and S， and Mn restrains the solidification segregation of S. Tin trends to segregate to grain boundary and the segregation ratio of tin in austenite is much higher than that in ferrite.