Effect of Shot Size and Peening Pressure on the Low Stress Abrasive Wear Behavior of Annealed Medium Carbon Steel

S.L. Ahirwar, D.P. Mondal, Mukesh Pandey, Shyam Birla

The effect of shot size and peening pressure on abrasive wear of annealed medium carbon steel has been studied. The peening pressure was varied between 3-5 bar and shot size in the range  of 0.6-1.00 mm at fixed peening intensity of 0.27A.The low stress abrasive wear tests were conducted using dry abrasion test rig TR-38 at an applied load of 50 N. It was noted in general, that the wear rate decreases with increase in sliding distance. It is interestingly noted that the minimum wear rate is observed at 0.8 mm shot size and 4 bar peening pressure. Further, decrease or increase in peening pressure or shot size leads to higher wear rate. This has been understood from the surface and the subsurface microstructures, work hardening and residual stress distribution after shot peening. The wear rate further correlated empirically with peening parameters.