Comparison of surface integrity of GH4169 superalloy after high-energy, low-energy, and femtosecond laser shock peening

被引:36
作者
Yu, Yanqing [1 ]
Gong, Jianen [2 ]
Fang, Xiuyang [2 ]
Zhou, Longlong [1 ]
He, Weifeng [3 ]
Zhou, Liucheng [3 ]
Cai, Zhenbing [1 ]
机构
[1] Southwest Jiaotong Univ, Tribol Res Inst, Key Lab Adv Technol Mat, Chengdu 610031, Peoples R China
[2] Southwest Jiaotong Univ, Sch Mech Engn, Chengdu 610031, Peoples R China
[3] Air Force Engn Univ, Sci & Technol Plasma Dynam Lab, Xian 710038, Peoples R China
基金
中国国家自然科学基金;
关键词
GH4169; superalloy; LSP; Surface characteristic; Microstructure evolution; RESIDUAL-STRESS; ALLOY; MICROSTRUCTURE; TEMPERATURE; STEEL;
D O I
10.1016/j.vacuum.2022.111740
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this study, different laser shock peening (LSP) techniques including high-energy laser shock peening (HE-LSP), low-energy laser shock peening (LE-LSP), and femtosecond laser shock peening (FS-LSP) were performed on GH4169 superalloy. The evolution of surface characteristics and microstructure was compared. Results show that the dominant deformation mechanism of GH4169 superalloy after various LSP treatments is dislocation slip, which leads to irregular atomic arrangement and high-density dislocations. The 8 phase in the gamma matrix restricts the movement of the dislocations and causes massive pile-ups at its boundaries. Thus, a special 8-phase/dislo-cation composite structure will promote the development of substructure in the deformed layer, although there is no obvious grain refinement. The deformed layer depth and damage mechanism are related to the pulse duration. The order of surface roughness, deformed depth, and arc height ranked according to LSP treatments is: HE-LSP > LE-LSP > FS-LSP. LE-LSP and FS-LSP could replace HE-LSP for thin-walled parts.
引用
收藏
页数:15
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