Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1575771 | Materials Science and Engineering: A | 2013 | 7 Pages |
Abstract
Fatigue is a major life limiting factor affecting service life of low pressure steam turbine blades which, depending on turbine rating, are generally made of martensitic stainless steel or Ti6Al4V alloy. The results of the present study has demonstrated that with respect to conventional shot peening, laser peening brought more than two times longer mean fatigue life of Ti6Al4V alloy. Enhanced fatigue performance of laser peened specimens was attributed to the deeper peened layer and smoother finish. In the case of DIN X20Cr13 stainless steel, laser peening did not register significant improvement in fatigue resistance over shot peening. At maximum test stress of 550Â MPa, DIN X20Cr13 stainless steel specimens, shot peened and laser peened specimens exhibited comparable fatigue lives. However, at lower magnitude of maximum test stress of 400Â MPa, laser peened specimens displayed about 30% longer fatigue lives than their shot peened counterparts. Similar fatigue lives of shot peened and laser peened specimens of DIN X20Cr13 stainless steel specimens is attributed to comparable magnitude of surface residual stress and case depth produced by the two peening treatments.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
B.K. Pant, R. Sundar, Harish Kumar, R. Kaul, A.H.V. Pavan, K. Ranganathan, K.S. Bindra, S.M. Oak, L.M. Kukreja, Raghu V. Prakash, M. Kamaraj,