Effect of Shot Peening on Erosion and Fatigue in Combined Bending and Torsion of the Magnesium Alloy AZ80

Author:  Jain, Nadkarni, Sharma
Source:  Conf Proc: ICSP-8 Sept. 16-20, 2002 Garmisch-Partenkirchen, Germany
Doc ID:  2002020
Year of Publication:  2002
Authors Ajit Jain, Vinod S. Nadkarni and Mahesh C. Sharma Maulana Azad National Institute of Technology, Bhopal, India Abstract Erosion is a micro-fatigue phenomenon and is generally caused by the breakdown of the protection film at the spot of impingement of entrained air bubbles on suspended particles in the liquid or turbulent flow of liquid substances and gases [1]. The positive effect of shot peening on erosion resistance of the magnesium alloy AZ80 was clearly observed during the experiment on an erosion testing machine. On average, 33 to 45 percent reduction in erosion was found in shot peened as compared to non-peened specimens. Shot peening was also beneficial in fatigue even under combined bending and torsion. The improvement in fatigue life of AZ80 was found to be more than 70 times due to shot peening with 1 mm cast steel at an intensity of 0.28 mmN at 200 percent coverage.