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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/082/02/0347-0351

    • Keywords

       

      Laser peening; turbine blade; residual stress; martensitic stainless steel.

    • Abstract

       

      Fretting-fatigue is an important factor influencing service life of turbine blades. The present paper describes laser shock peening of potential crack nucleation site in the root region of steam turbine blade for its enhanced service life. The experimental study, performed with an in-house developed 2.5 J/7 ns Nd:YAG laser demonstrated that laser peening introduced a residual surface compressive stress of −260 to −390 MPa. Case depth of laser peened surface layer was found to be more than 900 𝜇m.

    • Author Affiliations

       

      R Sundar1 B K Pant2 Harish Kumar1 P Ganesh1 D C Nagpure1 P Haedoo1 Rakesh Kaul1 K Ranganathan1 K S Bindra1 S M Oak1 L M Kukreja1

      1. Raja Ramanna Centre for Advanced Technology, Indore 452 013, India
      2. Bharat Heavy Electricals Ltd., Corporate R&D, Vikasnagar, Hyderabad 500 093, India
    • Dates

       
  • Pramana – Journal of Physics | News

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