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A Study on Effect of Multiple Laser Shock Peening on Microstructure, Residual Stress, and Mechanical Strength of 2.5 Ni-Cr-Mo (EN25) Low-Alloy Steel

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Abstract

The effect of multiple laser shock peening (LSP) on the microstructure, residual stress, and mechanical strength of 2.5 Ni-Cr-Mo, low-alloy steel (EN25) is investigated. LSP treatment is carried out for laser power density (LPD) in the range of 2.8 to 4.95 GW cm−2 with different laser impacts and by maintaining an overlap of 70% and 58% along scanning direction and perpendicular directions, respectively. LSP-treated samples are characterized by residual stress, microstructural evolution, and mechanical strength. Single, double, and triple LSP treatments at 3.53 GW cm−2 enhanced compressive residual stress at the surface by ~  − 520, ~  − 640, and ~  − 680 MPa compared to the as-received sample (− 100 MPa). In addition, for double and triple LSP impacts, the compressive residual stress is found at higher depths (850 and 965 µm) than single LSP (660 µm). XRD peak broadening analysis confirmed grain refinement and micro-strain in the LSP-treated samples. Further, the dislocation density increases with the number of laser impacts. As a result of microstructural refinement and creation of high dislocation density, the hardness in triple LSP-treated samples is increased by nearly 26% as compared to the unpeened one. Twenty percent improvement in yield strength and 12.5% improvement in ultimate tensile strength are observed in triple LSP-treated samples as compared to unpeened sample.

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Acknowledgments

The authors would like to express their gratitude to Mr. Lalit, LAML, LTD, RRCAT, for fabricating the sample holders required for laser peening EN25 samples and providing assistance throughout the laser peening experiments. The authors would like to express their appreciation to Mr. Pravin S. Hedaoo LTD, RRCAT for offering mechanical assistance for the maintenance of the laser shock peening facility.

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Authors and Affiliations

  1. School of Mechanical Engineering, SASTRA Deemed University, Thanjavur, 613401, India

    G. Muthukumaran & P. Dinesh Babu

  2. Laser Technology Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India

    Arun Kumar Rai, K. Ranganathan & K. S. Bindra

  3. School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad, 500046, India

    Jaiprakash Gautam

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  1. G. Muthukumaran
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Muthukumaran, G., Rai, A.K., Gautam, J. et al. A Study on Effect of Multiple Laser Shock Peening on Microstructure, Residual Stress, and Mechanical Strength of 2.5 Ni-Cr-Mo (EN25) Low-Alloy Steel. J. of Materi Eng and Perform 32, 4361–4375 (2023). https://doi.org/10.1007/s11665-022-07402-2

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