Thermodynamic Simulation of Equilibrium Precipitation Phases in a Martensitic Heat Resistant Stainless Steel

摘要：

　　The equilibrium precipitation at 650℃ in a martensitic heat resistant stainless steel were simulated,and the effects of alloy element contents of Mo,W,Nb and V on the precipitated phases were studied by using the thermodynamic calculation software Thermo-Calc.The results show that the equilibrium precipitation phases at 650℃ in the steel are mainly composed of M23C6,MX,Laves phase and Z phase.With the increase of Mo content,the precipitation of M23C6 and Z phase increases slightly and the precipitation of MX decreases slightly,while the precipitation of Laves phase increases slightly before the CHI phase beginning to precipitate out greatly and decreases significantly after that.With the increase of W content,the precipitation of M23C6 increases slightly and the precipitation of MX decreases slightly.When the content of W changes within a certain range,CHI phase will precipitate.Then the precipitation of CHI decreases sharply when Laves phase begins to precipitate.The change of W content has almost no influence on the precipitation of Z phase because of no W element in the Z phase.With the increase of Nb content,the precipitation of M23C6 decreases obviously and the precipitation of MX increases obviously,while the precipitation of Laves phase increases slightly and the precipitation of Z phase decreases slightly.With the increase of V content,the precipitation of M23C6 and Z phase decreases slightly,while the precipitation of MX increases very slightly.The change of V content has almost no influence on the precipitation of Laves phase because of no V element in it.The content of Mo,W,Nb and V has little effect on the dissolution temperature of M23C6 and MX.However,the dissolution temperature of Laves phase increases sharply with the increase of the content of Mo and W,especially it is greatly influenced by the change of W content.The dissolution temperature of Z phase decreases with the increase of Nb content,while it increases with the increase of V content.

关键词： martensitic heat resistant stainless steel computational thermodynamics equilibrium precipitation precipitated phase

作者: TANG Guangbo ZHANG Kaiqiang LIU Zhengdong

作者单位: Special Steel Institute,Iron and Steel Research Institute,Beijing 100081,China

会议类型: 国际会议

会议名称: STEELSIM2017(第七届冶金过程及钢铁材料模拟及仿真国际会议)

会议地点: 青岛

会议语种:英文

页码: 325-330

在线出版日期: 2017-08-16（万方平台首次上网日期，不代表论文的发表时间）