材料工程2025，Vol.53Issue(6)：12-23,12.DOI:10.11868/j.issn.1001-4381.2025.000056
定向凝固DSM11合金亚固溶恢复热处理工艺
Partial-solution rejuvenation heat treatment of directionally solidified DSM11 superalloy
摘要
Abstract
In view of the microstructure damage and property degradation of directionally solidified DSM11 service turbine blades,it is urgent to study the partial-solution rejuvenation heat treatment.In this study,the effects of different recovery heat treatments on the microstructure and mechanical properties of DSM11 superalloy are studied by using alloys after thermal exposure at 980℃for 500 h with reference to the microstructure of DSM11 blade in real service condition.The results show that bimodal microstructures of 23%secondary γ' phase with the size of approximately 270 nm and 17%coarse degraded γ' phase can be obtained by 1180℃/2 h solution combined with 1120℃/2 h/AC+850℃/24 h/AC recovery heat treatment.Meanwhile,the M23C6 carbides at the grain boundary,which are formed during the thermal exposure,are also dissolved.And γ' films on the grain boundary are also partially dissolved.Although the M23C6 carbides at the grain boundary can also be dissolved by direct aging at 1120℃without solution heat treatment,the γ' film on the grain boundary changes slightly.The size and volume fraction of the secondary γ' phase are closely related to the solution temperature and the cooling rate after the solution.The secondary γ' phase size obtained by furnace cooling is larger than that obtained by air cooling.The secondary γ' phase obtained at 1160℃solution treatment is completely dissolved in the subsequent aging process and will not be retained in the final.After 1180℃/2 h/AC+1120℃/2 h/AC+850℃/24 h/AC rejuvenation heat treatment,the creep life of degraded DSM11 superalloy is recovered from 18 h to 24 h,which is about 86%of that in standard heat treatment.A certain amount of the reprecipitated secondary γ' phases play an important role in the recovery of mechanical properties.关键词
亚固溶恢复热处理/定向凝固DSM11合金/双态组织/力学性能Key words
partial-solution rejuvenation heat treatment/directionally solidified DSM11 superalloy/bimodal microstructure/mechanical property分类
金属材料引用本文复制引用
周强,华小雨,黄春蓉,郑为为..定向凝固DSM11合金亚固溶恢复热处理工艺[J].材料工程,2025,53(6):12-23,12.基金项目
国家科技重大专项项目(J2019-Ⅶ-0010-0150) （J2019-Ⅶ-0010-0150）
