Variation of Surface Residual Stress Measured by Several X-Ray Projection Area for Peened Surface

Author:  Katsuji Tosha, Kisuke Iida
Source:  Conf Proc: ICSP-6, (p.424-431)
Doc ID:  1996088
Year of Publication:  1996
Abstract:  
The purpose of this study is to clarify the influence of X-ray projection area on the residual stress value. Shot peening was performed for plain carbon steel under several conditions (shot material: cast steel, shot size: 0.28-2.2 mm, velocity: 35m/s, full coverage time). At first, residual stress on the peened surface were measured with several x-ray projection area (0.15 - 2mm), and then on machined and ground surfaces to compare with the peened surface. The results obtained are as follows: 1) the less the projection area of x-ray, the more the amount of scatter, and the small area shows 20% large averaged value than the large area. 2) Over 1mm of the diameter of the projection area, the value of residual stress become constant.