沈阳航空航天大学学报2025，Vol.42Issue(1)：25-35,11.DOI:10.3969/j.issn.2095-1248.2025.01.003
高温合金GH4169超声喷丸强化表征与热影响分析
Characterization and thermal impact analysis of ultrasonic peening strengthening of superalloy GH4169
摘要
Abstract
To address the issue of improving the surface integrity of superalloy GH4169,ultrasonic peening and thermal exposure tests were conducted on superalloy GH4169 specimens.The specimens were first subjected to ultrasonic peening tests with a penning coverage of 98%～125%and peening intensity of 0.15 A and 0.25 A.Then the specimens were thermally exposed at 250 ℃,400 ℃ and 550 ℃ for 1 hour and 10 hours respectively.Finally,the effects of ultrasonic peening on the surface roughness,hardness,microstructure and residual compressive stress of superalloy GH4169 were analyzed,as well as the changes in residual compressive stress after thermal exposure.The results indicate that after ultrasonic peening,the surface of superalloy GH4169 undergoes plastic deformation and the surface hardness significantly increases.The grain refinement in the near-surface layer is significant,and the grain size shows a gradient distribution from the surface layer to the depth,introducing residual compressive stress in the surface layer.Compared to 0.15 A,the peening intensity of 0.25 A increases the grain refinement by 29%.After high-temperature thermal exposure,the residual compressive stresses on the surface of superalloy GH4169 undergo thermal relaxation,with the maximum rate occurring at the initial stage of thermal exposure,after which it tends to stabilize and becomes independent of the duration of thermal exposure.The higher the thermal exposure temperature,the more intense the relaxation of the near-surface residual stress and the greater the depth at which the maximum residual compressive stress is located.关键词
高温合金GH4169/超声喷丸/热暴露/表面完整性/热松弛Key words
superalloy GH4169/ultrasonic peening/thermal exposure/surface integrity/thermal relaxation引用本文复制引用
蔡晋,任晓光,姚伟..高温合金GH4169超声喷丸强化表征与热影响分析[J].沈阳航空航天大学学报,2025,42(1):25-35,11.基金项目
中国航发产学研合作项目(项目编号:HFZL2019CXY024-1). （项目编号:HFZL2019CXY024-1）
