Morphological evolution ofγ'precipitate under various rejuvenation heat treatment cycles in a damaged nickel-based superalloy  

作　　者：Xiao-Meng Wang Yu Zhou Tian-You Wang Zi-Hua Zhao Zheng Zhang 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing,100191,China [2]School of Mechanical Engineering,Anhui University of Technology,Ma’anshan,243032,China

出　　处：《Rare Metals》2023年第2期645-650,共6页稀有金属（英文版）

基　　金：financially supported by the University-Industry Cooperation Project from Aviation Industry Corporation of China(No.cxy2010BH06)。

摘　　要：The morphological evolution ofγ’precipitates for a damaged nickel-based superalloy GTD-111 under different rejuvenation heat treatments(RHTs)was investigated.The degeneratedγ’precipitates can be completely dissolved into the y matrix under the full solution condition of 1200℃/2 h,and only fineγ’precipitates re-precipitated during the cooling stage of the full solution can be observed,but these fineγ’precipitates cannot grow continuously to be similar as those in virgin alloy during the subsequent long-term aging.It is found that the newly developed RHT schedule,including the full solution,the partial solution,and the aging treatments,can effectively recover the degeneratedγ’precipitates in the GTD-111superalloy to their original state.Moreover,the effects of different RHT cycles on theγ’evolution were investigated.The experimental results show that the degeneratedγ’precipitates can be restored to be analogous with those in virgin alloy by slow cooling after the full solution and an appropriate partial solution followed by the long-term aging.Compared with the different microhardness under various RHT schedules,the microhardness after full solution and partial solution followed by aging is more close to that of the initial alloy.

关 键 词：Nickel-based superalloys Rejuvenation heat treatments MICROSTRUCTURES Slow cooling 

分 类 号：TG132.3[一般工业技术—材料科学与工程]