航空材料学报2025，Vol.45Issue(1)：53-61,9.DOI:10.11868/j.issn.1005-5053.2024.000086
喷丸强度对DD6单晶高温合金表面完整性的影响
Effect of shot peening intensities on surface integrity of DD6 single crystal superalloy
摘要
Abstract
The service life of single crystal turbine blades,which serve as pivotal components in aero-engines,is intricately tied to their surface integrity.To fulfill performance standards,these blades typically undergo shot peening to meet for reinforcement.This study meticulously examines the impact of surface morphology and various surface integrity indicators—including roughness,near-surface microstructure,hardness,and residual stress—on DD6 single-crystal superalloy before and after undergoing shot peening treatments of varying intensities(0.15,0.2 mmA,and 0.25 mmA).Utilizing a surface profilometer,scanning electron microscope,microhardness tester,and stress tester,we comprehensively analyze these factors.The results show that shot peening diminishes the original machining marks on the DD6 superalloy's surface,with surface roughness escalating from 0.507 μm at 0.15 mmA to 0.883 μm at 0.25 mmA.A gradient plastic severe deformation layer emerges near the surface,its depth progressively increasing from 45 μm at 0.15 mmA to 98 μm at 0.25 mmA.Furthermore,the surface hardness value rises steadily,from 490HV in the original specimen to 738HV at 0.25 mmA,with the hardened layer's depth also augmenting,from 50 μm initially to 260 μm at 0.25 mmA.Notably,the alloy attains its peak residual compressive stress of approximately-821.2 MPa on the surface when subjected to a blasting intensity of 0.2 mmA.关键词
DD6单晶高温合金/喷丸强化/表面完整性/残余应力/塑性变形Key words
DD6 single crystal superalloy/shot peening/surface integrity/residual stress/plastic deformation分类
航空航天引用本文复制引用
盖鹏涛,武赟华,曹子文,魏大盛,付雪松..喷丸强度对DD6单晶高温合金表面完整性的影响[J].航空材料学报,2025,45(1):53-61,9.基金项目
国家科技重大专项(J2019-Ⅳ-0012-0080) （J2019-Ⅳ-0012-0080）
