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Effects of rejuvenation heat treatment on microstructure and creep property of a Ni-based single crystal superalloy

查看全文 作　　者：[1,2]K.J.Tan;[1]X.G.Wang;[1]J.J.Liang;[1]J.Meng;[1]Y.Z.Zhou;[1]X.F.Sun 高影响力作者 机构地区：[1]Superalloys Division,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[2]Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2021年第1期,共10页高影响力期刊 基　　金：financially supported by the National Science and Technology Major Project(No.2017-VI-0002-0072);the National Key R&D Program of China(Nos.2017YFA0700704,2018YFB110660 and 2017YFB1103800);the National Natural Science Foundation of China(Nos.51601192,51671188,51701210 and 51771190);the Youth Innovation Promotion Association,the Chinese Academy of Sciences;State Key Lab of Advanced Metals and Materials Open Fund(No.2018-Z07)。 摘　　要：Both surface and internal microstructures of a second-generation Ni-based single crystal(SX) superalloy were studied after creep and rejuvenation heat treatment(RHT).It is indicated that the microstructures,such as the dislocation network,the γ phase and the γ' phase,can be recovered to those after the standard heat treatment(SHT).It is found that RHT affected zone(RAZ) formed at the surface is composed of theγ'-free layer,the transition layer and the recrystallization(RX),which are less than 20 μm in depth totally.Such depth of the RAZ doesn't affect the properties of the superalloy.The morphology of γ' phase at the RAZ is related to the composition of the elements.The average creep life after RHT is close to the average life after SHT.It is concluded that RHT could effectively repair SX parts and increase the total life of the sample after a damage by creep. 关 键 词：SUPERALLOYS Rejuvenation heat treatment MICROSTRUCTURE Creep property
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