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Microstructure, mechanical, and corrosion properties of electron beam-welded commercially pure titanium after laser shock peening

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Abstract

Surface properties play a critical role in the structural integrity of any component and this becomes even more critical for weld joints. Laser shock peening (LSP) is one of the non-contact methods which is getting popular in industries to enhance surface properties for improving service life, mainly fatigue of engineering components. In the present study, electron beam welding (EBW) of commercially pure (cp) titanium was carried out at constant line energy with varying scan speeds ranging from 1000 to 1600 mm/min and welding currents from 25 to 40 mA. The influence of the EBW parameters on microstructure, surface micro-hardness, tensile, and fatigue strength was investigated. The effect of LSP on mechanical and corrosion properties of EBW cp titanium was studied. LSP induced a significant amount of compressive residual stresses at the surface through plastic deformation and led to significant improvement in micro-hardness (7–10%) at the sub-surface region of the fusion zone due to finer grain structure. Further, appreciable enhancement in tensile strength (~ 15%) and fatigue life (~ 43%) due to strain hardening and changes in microstructure like twinning within grains was realized.

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The raw/processed data required to reproduce the experimental findings cannot be shared at this time as the data also forms part of an ongoing study.

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Acknowledgements

The authors would like to thank Prof. Debalay Chakrabarti, Dept. of Metallurgical and Materials Engineering., IIT Kharagpur, for giving access to fatigue testing facility procured under “Institute SGDRI-2015 grant for the development of the testing facility in Dept of MME, IIT Kharagpur” and Mr. Amlan Mahata, Mechanical Engineering Department, for his assistance in conducting the experiments.

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Funding

This work was supported by the Department of Heavy Industry (DHI) and Ministry of Human Resource Development (MHRD), Government of India under IMPRINT project 6917, sanction letter 3-18/2015-T.S.-I (Vol.-III) dated 20-01-2017.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology, IIT Kharagpur, Kharagpur, 721302, India

    Angshuman Chattopadhyay, Gopinath Muvvala, Sagar Sarkar, Vikranth Racherla & Ashish Kumar Nath

  2. Department of Mechanical & Aerospace Engineering, Indian Institute of Technology, Hyderabad, India

    Gopinath Muvvala

  3. Department of Mechanical Engineering, Indian Institute of Technology, Delhi, India

    Sagar Sarkar

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  1. Angshuman Chattopadhyay
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  2. Gopinath Muvvala
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Correspondence to Ashish Kumar Nath.

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Chattopadhyay, A., Muvvala, G., Sarkar, S. et al. Microstructure, mechanical, and corrosion properties of electron beam-welded commercially pure titanium after laser shock peening. Int J Adv Manuf Technol 118, 343–364 (2022). https://doi.org/10.1007/s00170-021-07955-x

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