Finite Element Analysis of Residual Stress of AISI 9310 Steel By Laser Shock Peening and Composite Strengthening

WANG Zhen; CUI Yilong; WANG Minghao; HAN Jiabao; SONG Haotian

doi:10.3969/j.issn.1674-6457.2025.09.015

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (9) : 157-166. DOI: 10.3969/j.issn.1674-6457.2025.09.015

Iron and Steel Forming

Finite Element Analysis of Residual Stress of AISI 9310 Steel By Laser Shock Peening and Composite Strengthening

WANG Zhen^*, CUI Yilong, WANG Minghao, HAN Jiabao, SONG Haotian

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Abstract

The work aims to study the effect of different laser shock peening and laser shock peening-shot peening process parameters on the residual stress strengthening of AISI 9310 steel. The constitutive model of laser shock peening and shot peening strengthened AISI 9310 steel was selected to determine the loading mode of laser shock wave in finite element analysis. The numerical analysis model of laser shock peening and laser shock peening-shot peening strengthening of AISI 9310 steel was established based on Abaqus software. The effect of mesh size on residual stress was analyzed, and the effect laws of different laser power densities and laser spot sizes on the residual stress of AISI 9310 steel were explored. Then, the reliability of the finite element model was verified. On this basis, the effect of laser shock peening-shot peening strengthening on the residual stress was studied. Under laser shock peening strengthening, as the laser power density increased, the residual compressive stress at the center of the material surface and the peak value of the residual compressive stress both increased. When the maximum laser power density was 14.5 GW/cm², the residual compressive stress introduced at the center of the surface was -719.4 MPa, and the depth of the residual compressive stress layer exceeded 500 μm. As the spot size increased, the depth of the residual compressive stress strengthening layer, the strengthening area, and the peak value of the strengthening area all increased. When the maximum spot diameter was 3 mm, the residual compressive stress layer introduced was the deepest, about 800 μm, and the peak value was the largest, -687.87 MPa. The residual compressive stress introduced at the center of the material surface by laser shock-shot peening strengthening was -1 121.36 MPa. Compared with the effect of single laser shock strengthening, the residual compressive stress was effectively enhanced. The peak value of the residual compressive stress was located at the subsurface about 80 μm from the surface, with a maximum of -1 392.56 MPa, which was higher than that under single laser shock peening strengthening, and the location was lower, but the surface residual stress distribution fluctuated greatly after composite strengthening. Larger laser power density and larger spot diameter can introduce better residual compressive stress field, and the residual stress field introduced by laser shock peening-shot peening is more effective than that by single laser shock peening.

Key words

AISI 9310 steel / residual stress / laser shock peening / finite element analysis / composite strengthening

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WANG Zhen, CUI Yilong, WANG Minghao, HAN Jiabao, SONG Haotian. Finite Element Analysis of Residual Stress of AISI 9310 Steel By Laser Shock Peening and Composite Strengthening[J]. Journal of Netshape Forming Engineering. 2025, 17(9): 157-166 https://doi.org/10.3969/j.issn.1674-6457.2025.09.015

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Funding

National Natural Science Foundation of China (51705471); The Natural Science Foundation Project of Henan Province (242300420052); The Graduate Education Innovation Program Fund of Zhengzhou University of Aeronautics (2024CX100)