Solidification segregation behavior of Nb-containing 310S steel  

作　　者：Yu-tuo Zhang Hao Zou 

机构地区：[1]School of Materials Science and Engineering,Shenyang Ligong University,Shenyang 110159,Liaoning,China [2]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2023年第1期82-87,共6页

基　　金：supported by Joint Fund of National Natural Science Foundation of China and Liaoning Province (No.U1708252);Industrial Strong Foundation Project (TC190A4DA/35);the Scientific Research Project of China Three Gorges Corporation (No.JD-YJ-05006).

摘　　要：The solidification characteristics and segregation behavior of solute elements Nb,Ni,Mn,Si,Cr and C in 0.3 wt.%Nb-310S steel were investigated using the isothermal solidification quenching experiment and Thermo-Calc calculation.The phase transformation for 0.3%Nb-310S steel under equilibrium condition can be summarized as follows:liquid(L)→L+γ(1406℃)→γ(1334℃)→γ+NbC(1322℃)→γ+NbC+M_(23)C_(6)(1006℃)→γ+NbC+M_(23)C_(6)→σ(755℃).The results showed that the solidification began with the formation of primary austenite dendrite.The volume fraction of the liquid phase decreased rapidly as the temperature decreased in the initial solidification stage,and then,the liquid phase fraction decreased slowly.When austenite formed,Mn and Ni were enriched in the solid phase,while Nb and C were rejected into the liquid.Nb was present the highest segregation coefficient in 0.3%Nb-310S austenitic stainless steel.The segregation of Nb was the most serious,followed by Mn,Ni and C.Cr and Si exhibited slight segregation during the solidification.The solidification was terminated by the formation of NbC phase.

关 键 词：310S steel Nb SOLIDIFICATION SEGREGATION Thermo-Calc calculation 

分 类 号：TG142[一般工业技术—材料科学与工程]