EFFECTS OF Mo CONTENT ON MICROSTRUCTURE AND MECHANICAL PROPERTY OF PH13-8Mo MARTENSITIC PRECIPITATION-HARDENED STAINLESS STEEL
This paper introduces the effects of Mo content on microstructure and mechanical property of PH13-8Mo martensitic precipitation-hardened stainless steel which is used for LP last stage blade in steam turbine.Thermodynamic software Thermo-Calc has been used to calculate precipitation temperature and the mass fraction of precipitated phases in PH13-8Mo steel with different Mo content.The result shows that when the mass of Mo is below 0.6wt.%,chi-phase、mu-phase and sigma-phase could disappear.The microstructure and mechanical property of high Mo PH13-8Mo(Mo=0.57wt.%)and low Mo PH13-8Mo(Mo=2.15wt.%)have been investigated in different heat treatments.The investigations reveal that austenitizing temperature decrease with the reduce of Mo content,so the optimum solution temperature for low Mo PH13-8Mo is lower than that for high Mo PH13-8Mo.The influence of solution temperature on grain size is weakened with the increase of Mo content,Mo rich carbides could retard coarsening of grain.An enormous amount of nano-size uniformly distributed β-NiAl particles are found in both kinds of steels using transmission electron microscopy,they are the most important strengthening phase in PH13-8Mo.
PH13-8Mo solution temperature aging temperature mechanical
Pei Yubing Wang Tianjian Gao Zhenhuan Fan Hua Yang Gongxian
Long-life High Temperature Material Key Laboratory of Sichuan Province Jin Sha River West Road DeYang,SiChuan,61800,China;Material Research Center,DongFang Turbine Co.Ltd Jin Sha River West Road DeYang,SiChuan,61800,China
国际会议
Energy Materials 2014(第一届能源材料国际会议)
西安
英文
321-326
2014-11-04（万方平台首次上网日期，不代表论文的发表时间）