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Surface Oxidation and Subsurface Deformation in a Laser-Peened Ti-6Al-4V

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Abstract

Laser peening without coating (LPwC) was carried out at multiple passes on Ti-6Al-4V at a power density of 6 GW cm−2. Tensile residual stress (65 MPa) was observed on the LPwC sample surface, without surface melting and re-solidification. Further, an oxide layer (TiO) had formed on the surface of the LPwC samples, without alpha case formation. Both these results have not been reported in Ti-6Al-4V. Secondary ion mass spectrometry (SIMS) revealed the presence of oxide layer < 10 μm in thickness on LPwC samples. Acid pickling was used as a practical post-processing technique to eliminate the oxide layer, without causing hydrogen embrittlement. Laser peening induced a residual stress of −233 MPa at the surface and maximum residual stress of −552 MPa at a depth of 50 μm after pickling in Ti-6Al-4V samples. Further, high- and low-angle grain boundaries were found to have increased after peening, increasing further the strength of the alloy, as shown by microhardness profiles.

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Acknowledgments

We thank Aeronautics R&D Board, India (Grant No. ARDB/GTMAP/01/2031839/M/I) for the financial support, VIT University for the infrastructure and constant support throughout the project, National Facility of OIM and Texture and Sophisticated Analytical Instrument Facility (SAIF) at IIT-Bombay for EBSD and SIMS measurements. One of us (SS) would like to thank Dr. Allan H. Clauer (LSP Technologies, OH, USA) for useful discussions.

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  1. School of Mechanical Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, India

    K. Praveenkumar

  2. Defence Metallurgical Research Laboratory, Hyderabad, India

    Phani Mylavarapu

  3. Surface Modification Laboratory, School of Advanced Sciences, Vellore Institute of Technology, Vellore, Tamil Nadu, India

    K. Praveenkumar & S. Swaroop

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Praveenkumar, K., Mylavarapu, P. & Swaroop, S. Surface Oxidation and Subsurface Deformation in a Laser-Peened Ti-6Al-4V. J. of Materi Eng and Perform 32, 7348–7362 (2023). https://doi.org/10.1007/s11665-022-07639-x

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