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

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.

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

Published

February 2014

Early published

13 February 2014