Distribution of Residual Stress Along Depth Under Different Shot Peening Technoloties

The residual stresses engendered by 16 different shot peening technologies were researched and analyzed systemically by using x-ray method in this paper.For each shot peening work-piece,4 different test points were chosen and 8 different depths 0~250 μm under the surface for each point were tested by step-by-step electrolytic polishing method.And then the equations of polishing electric current,depth and time were figured out by experimental demarcation using self-making fixture,which solved the problem that data obtained and measured accurately at 25 μm depth,and got the residual stress distribution of these 16 technologies.It was shown that the max residual compress stress of home made shot peening was at the depth of 50 μm under the surface and the influence layer was 150 μm depth,while 50~75 μm and 200 μm respectively for the import one.The rotating speed of throwing wheel is proportional to the A1 value,and the max residual stress increased slightly along with Al value but no quantity relationship between them.The depth of residual stress influence layer after shot peening has directly relation with shot character,but rotating speed.