NDLI: Effect of Laser Peening on Steel and Titanium Alloy for Power Applications

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Bharat, K. Pant Raghu, V. Prakash Kamaraj, M.
Copyright Year	2013
Abstract	Low pressure steam turbine (LPST) blades are made of martensitic stainless steel and Ti6Al4V alloy for the different ratings of steam turbines due to their high strength and toughness. These blade roots have a fir tree profile and experience severe stress concentrations all along their notched sections during turbine operation. The fatigue life of these blades can be increased by introducing compressive stresses either by shot peening or by laser peening. The present work deals with laser peening of these two materials to understand its effect on their fatigue properties, surface roughness and hardness. It is observed that laser peening has significantly enhanced fatigue life of Ti6Al4V alloy at 550 MPa stress as compared to the shot peened sample. The penetration depth of residual stress due to laser peening in the Ti6Al4V alloy was twice that due to shot peening. However, the fatigue life of steel was found to be similar for both the shot peened as well as laser peened samples. Similar response was observed from testing at lower stresses (400 MPa). Since the depth of penetration of compressive residual stresses for both the laser peened as well as the shot peened samples were similar for steels, it can be concluded that the fatigue life is a strong function of the penetration depth.
File Format	PDF
ISBN	9780791856185
DOI	10.1115/IMECE2013-63589
Volume Number	Volume 2A: Advanced Manufacturing
Conference Proceedings	ASME 2013 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2013-11-15
Publisher Place	San Diego, California, USA
Access Restriction	Subscribed
Subject Keyword	Lpst blades Shot peening Surface treatment Laser peening Laser hardening Titanium alloys Blades Steel
Content Type	Text
Resource Type	Article

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