5Cr15MoV马氏体不锈钢热加工过程碳化物析出

Carbide precipitation in 5Cr15MoV martensitic stainless steel during hot working

采用热模拟试验机对5Cr15Mo V马氏体不锈钢热加工过程进行了模拟,并使用金相显微镜及物理化学相分析方法对热加工过程中的碳化物析出进行了分析。结果表明:与Thermo-Calc热力学计算结果不同,热加工过程中在1100~1150℃之间,5Cr15Mo V钢主要析出MC型碳化物,且随温度的降低,析出量逐渐加大,在1000~1100℃之间趋于平衡,而M_(23)C_6型碳化物则在1000℃左右析出,整个热加工过程中,并未发现M_7C_3型碳化物析出。

Hot deformation process of 5Cr15 MoV martensitic stainless steel was simulated by thermo-mechanical simulator. The carbide precipitated in the process was investigated by means of metallographic microscope and physical chemistry phase analyzed measures. The results show that different from the thermodynamic calculation results of Thermo-Calc,the precipitated carbide in 5Cr15 Mo V steel during hot deformation at 1100-1150 ℃ is mainly MC,and the amount of it increases with the decrease of temperature,which tends to the balance at the range of 1000-1100 ℃. Yet,the M（23）C6 carbide precipitates at around 1000 ℃,and the M7C3-type carbide is not observed during the whole hot deformation process.