The effect of warm laser shock peening on the thermal stability of compressive residual stress and the hot corrosion resistance of Ni-based single-crystal superalloy

• Published in: Optics and laser technology Vol. 146; p. 107556
• Main Authors: Tang, Zhanghan, Dong, Xia, Geng, Yongxiang, Wang, Kedian, Duan, Wenqiang, Gao, Meng, Mei, Xuesong
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.02.2022; Elsevier BV
• Subjects: Compressive properties; Corrosion resistance; Dislocation density; Dynamic strain aging; Electron microscopy; Field emission microscopy; Heat treatment; Hot corrosion; Hot corrosion resistance; Laser shock processing; Lasers; Microscopy; Ni-based single-crystal superalloy; Nickel base alloys; Peening; Precipitation hardening; Residual stress; Single crystals; Superalloys; Surface stability; Thermal stability; Thermal stability of compressive residual stress; Warm laser shock peening; Hot corrosion resistance; Warm laser shock peening; Ni-based single-crystal superalloy; Thermal stability of compressive residual stress
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2021.107556

•The deformation mechanism of nickel-based single crystal superalloy by WLSP and LSP are derived.•The presence of the protective oxide layer can improve the hot corrosion resistance of the sample.•The hot corrosion resistance of the LSP-ed sample to improve with the increasing temperature. Warm laser shock peening (WLSP) is a new surface modification technique combining laser shock peening (LSP) and dynamic strain aging (DSA). In order to investigate the surface modification of Ni-based single-crystal superalloy by WLSP and the mechanism of action, and to compare LSP, WLSP, and LSP experiments were conducted on DD6 (Chinese Brand) samples. After that, the samples were subjected to heat treatment and hot corrosion experiments, respectively. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and field emission transmission electron microscopy (FE-TEM) to obtain the deformation and strengthening mechanisms of WLSP and LSP on the material. In addition, the experimental results were analyzed to obtain the improvement mechanism of WLSP on the thermal stability of compressive residual stress and the hot corrosion resistance of the samples. To summarize the experimental results, we obtained that the near-surface dislocation distribution, dislocation density, thermal stability of compressive residual stress, and hot corrosion resistance of the material all tend to improve with increasing temperature for the WLSP-treated samples.