Effect of Laser Shock Peening on the Fatigue Life of 1Cr12Ni3Mo2VN Steel for Steam Turbine Blades

Tang, Zhuolin; Gao, Jiashun; Xu, Zhilong; Guo, Bicheng; Jiang, Qingshan; Chen, Xiuyu; Weng, Jianchun; Li, Bo; Chen, Junying; Zhao, Zhenye

doi:10.3390/coatings13091524

Cited by 5 publications

(1 citation statement)

References 40 publications

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“…Due to the proven ability of LSP to enhance fatigue life [8,[11][12][13][14][15][16], there is intensive research focused on deepening the knowledge of the physics involved in LSP. This way, the costly experimental trial and error to achieve a successful fatigue life enhancement can be reduced drastically.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Viscous Drag on the Maximum Residual Stresses Achievable in High-Yield-Strength Materials in Laser Shock Processing

Angulo,

Warzanskyj,

Cordovilla

et al. 2023

Materials

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In this paper, the experimentally observed significant increase in yield stress for strain rates beyond 104 s−1 (viscous regime) is explicitly considered in laser shock processing (LSP) simulations. First, a detailed review of the most common high-strain-rate deformation models is presented, highlighting the expected strain rates in materials subject to LSP for a wide range of treatment conditions. Second, the abrupt yield stress increase presented beyond 104 s−1 is explicitly considered in the material model of a titanium alloy subject to LSP. A combined numerical–analytical approach is used to predict the time evolution of the plastic strain. Finally, extended areas are irradiated covering a squared area of 25 × 25 mm2 for numerical–experimental validation. The in-depth experimental residual stress profiles are obtained by means of the hole drilling method. Near-surface-temperature gradients are explicitly considered in simulations. In summary, the conventionally accepted strain rate range in LSP (106–107 s−1) is challenged in this paper. Results show that the conventional high-strain-rate hardening models widely used in LSP simulations (i.e., Johnson Cook model) clearly overestimate the induced compressive residual stresses. Additionally, pressure decay, whose importance is usually neglected, has been found to play a significant role in the total plastic strain achieved by LSP treatments.

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