Effect of Thermomechanical Heat Treatment in the Magnetic Field on the Creep Properties and Microstructures of the High Cr Ferritic Heat Resistant Steel
作者单位：Heat Resistant Group Steel Research Center National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan) Heat Resistant Group Steel Research Center National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan) Heat Resistant Group Steel Research Center National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan)
会议名称：《第二届先进钢铁结构材料国际会议》
会议日期：2004年
学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化]
关 键 词：USC Power Plant Thermomechanical Heat Treatment Magnetic Field
摘 要：正Effect of thermomechanical and magnetic treatment on creep characteristics of advanced heat resistant ferritic steels for USC power plants has been investigated to explore fundamental guiding principles for improving creep rupture strength at elevated temperaturesover600℃. Amodelsteelwithacompositionof Fe-0.08C-9Cr-3.3W-3Co-0.2V-0.05Nb-0.05N-0.005B-0.3Si-0.5Mn （in mass%） has been prepared by vacuum induction furnace. Creep tests at 650℃and microstructural observations were performed on the thermomechanical and magnetic treated specimens after *** thermomechanical treated samples without magnetic field showed some improvement in creep strength comparing with ordinarily normalized and tempered *** improvement was observed in the specimen that had been exposed to a magnetic field during transformation into the martensite. From the result of microstructural observation, it was found that the finely distributed precipitates such as MX and M23C6 caused this improvement. And it was suggested that the magnetic treatment at martensitic transformation increase the precipitation sites during tempering, resulting in increasing the amount and preventing the growth of the precipitates.