The Optimization of Shot Peening Parameters in AISl403 Stainless Steel

Author:  L. Ye, Q. Huang, E.W. Qin, G. X. Chen, Z. M. Tan, S. H. Wu
Source:  Conf Proc 2014: ICSP-12 Goslar, Germany (pgs.416-420)
Doc ID:  2014113
Year of Publication:  2014
Abstract:  
Fatigue is a well-known failure problem for low-pressure end turbine blades, especially at the stress-concentration locations such as fir tree roots or dovetails. Shot peeing is one of the most economical and effective approaches to enhance fatigue life by means of eliminating the oxidation layer and imposing a residual compressive stress layer on the surface. In this work, we present a systematic study on the correlation between the peening parameters with the surface morphology and residual stress. The typical blade material, AISl403 matensitic stainless steel, was employed for shot peeing. The dominant parameters of peening pressure and coverage were varied with fixed peening distance, peening angles, shot grits, etc. The peening effects were evaluated by compressive residual stress and surface roughness. The optimized parameters were further analyzed by microhardness distribution underneath treated surface.