Microstructure evolution and residual stress changes of the GH4169 alloy by wet shot peening

2019 International Conference on Advanced Electronic Materials, Computers and Materials Engineering

无线电电子学;计算机科学;材料科学

Zhou, P.F.^1 ; Zheng, H.Z.^1 ; Guo, S.H.^1 ; Cheng, S.P.^1 ; Li, G.F.^1

National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang

330063, China^1

关键词: Compressive residual stress;    Deformation mechanism;    Deformation twining;    Micro-structure evolutions;    Processing parameters;    Residual compressive stress;    Surface microhardness;    TEM observations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/563/2/022040/pdf
DOI  :  10.1088/1757-899X/563/2/022040

来源: IOP

【 摘 要 】

GH4169 alloy was shot-peened with processing durations of 3 min and 10 min. The effects of dry and wet shot peening on the microstructure and residual stress were investigated. The results demonstrated that a severely deformed layer manifests on the surface of the shot-peened GH4169 alloy samples. Compared with the dry-peening samples, the surface defects of wet-peening samples obviously decrease. With the shot peening treated for 10 min, the surface microhardness of the dry peening and the wet shot peening increased by 20% and 17% respectively compared with the original surface hardness. The deformation mechanisms of the GH4169 alloy could be attributed to dislocation and deformation twining, as detected by TEM observations. Compressive residual stress was introduced into the surface layer of the shot-peened GH4169 alloy. The maximum surface residual compressive stress (SRS) and maximum residual compressive stress (MRS) were-586 MPa and-795 MPa, respectively. The MRS and SRS were improved with increasing processing duration. The SRS of the wet-treated specimens was slightly higher than that of the dry-treated samples under the same processing parameters. However, the MRS of dry-treated samples was much larger than that of the wet-treated samples due to the higher shot intensity.