STRESS CORROSION BEHAVIOR OF 12Cr MARTENSITE STEEL FOR STEAM TURBINE LP BLADE
With the development of capacity and efficiency of coal-fired thermal power plant,the length of Low Pressure(LP)last-stage blade of steam turbine became longer.Therefore,the design static stress of blade gets closer or even higher than the yield strength of material.Because of the special operation condition of LP last stage blade,the stress corrosion crack of 12Cr-Ni-Mo-V-N Martensite stainless steel may happen especially at the root of the blade where designed the highest static stress.In this paper,the stress corrosion behavior of 12Cr-Ni-Mo-V-N Martensite stainless steels used for steam turbine LP last stage blade in 3vol%NaCl solution was studied,the constant stress is about 95%,85%,65%and 35%of yield stress respectively and the test was lasted for 3000 hours,the stress corrosion behavior was studied and then,the effect of shot penning strengthen for anti-stress corrosion property of 12Cr-Ni-Mo-V-N Martensitic steel was studied.The results showed that the purity of steel affects the stress corrosion behavior huge especially at the high and medium stress condition.The shot penning cannot enhances the anti-stress corrosion property of the 12Cr-Ni-Mo-V-N steel at high tensile constant stress condition,however it will make the anti-stress corrosion property better when the stress is low.
Stress corrosion LP Last Stage Blade 12Cr martensite steel
Wang Tianjian Pei Yubing 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
327-332
2014-11-04（万方平台首次上网日期，不代表论文的发表时间）