摘要
通过解剖实际服役499 h的DZ125涡轮叶片,并结合人工神经网络模型对叶片不同部位进行服役温度和应力评估,确定涡轮叶片的正常和超温服役组织。以涡轮叶片用DZ125合金为研究对象,通过925℃/32~200 MPa/500 h和1075℃/10~60 MPa/100 h的变截面实验模拟叶片的正常和超温服役,并对两种服役组织进行1200℃固溶温度的亚固溶恢复热处理,观察亚固溶恢复热处理对两种服役组织的影响。结果表明:DZ125涡轮叶片损伤最严重部位为叶身中部的进气边,服役温度最高达到1075℃。DZ125合金在1075℃变截面条件下的显微组织退化情况比925℃变截面条件下的严重,经过亚固溶恢复热处理,925℃变截面条件模拟的正常服役组织退化,而1075℃变截面条件模拟的超温服役组织中有立方状二次γ′相析出,特定超温服役损伤态DZ125合金经过亚固溶恢复热处理后,在980℃/220 MPa条件下的蠕变寿命由16 h提升到25 h。亚固溶恢复热处理对正常服役组织是不利的,对超温服役组织有恢复效果。
By dissecting DZ125 turbine blades that have been in actual service for 499 h and integrating an artificial neural network model to assess the service temperature and stress in various blade components,the normal and overtemperature service tissues of the turbine blades have been identified.Focusing on DZ125 alloy for turbine blades,simulations of normal and overtemperature service conditions are conducted through variable cross-section experiments at 925℃/32-200 MPa/500 h and 1075℃/10-60 MPa/100 h,respectively.Both service structures undergo sub-solvus recovery heat treatment at a solid solution temperature of 1200℃,and the impacts of this treatment on both service structures are observed.The results reveal that the most severely damaged part of the DZ125 turbine blade is the leading edge in the middle of the blade,with a maximum service temperature of 1075℃.The microstructure degradation of DZ125 alloy is more pronounced at 1075℃compared to 925℃.Following sub-solvus recovery heat treatment,the normal service structure simulated at 925℃with variable cross sections exhibits degradation,whereas the overtemperature service structure simulated at 1075℃with variable cross sections shows precipitation of cubic secondaryγ′phase.Notably,after sub-solvus recovery heat treatment,the creep life of DZ125 alloy in a specific overtemperature service damage state increases from 16 h to 25 h under conditions of 980℃/220 MPa.The sub-solvus recovery heat treatment proves detrimental to the normal temperature service microstructure but has a beneficial recovery effect on the overtemperature service microstructure.
作者
翟梦园
邵益凯
王辉明
郑为为
ZHAI Mengyuan;SHAO Yikai;WANG Huiming;ZHENG Weiwei(State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;Process Research Center,AECC Aviation Power Co.,Ltd.,Xi’an 710021,China)
出处
《材料工程》
北大核心
2025年第6期1-11,共11页
Journal of Materials Engineering
基金
国家科技重大专项(J2019-Ⅶ-0010-0150)。
关键词
DZ125涡轮叶片
超温服役组织
变截面实验
亚固溶恢复热处理
DZ125 turbine blade
overtemperature service microstructure
variable section test
sub-solvus recovery heat treatment
