Effect Of Shot Blasting On Physical Properties Of Steel

Author:  Mattson, R.L. and Almen, J.O.
Source:  I,OSRD,No.3274;II,OSRD No.4825;III,OSRD No.6697
Doc ID:  1945000
Year of Publication:  1945
Abstract:  
The work of one year on the study of the shot peening process is summarized in this report. The study consisted primarily of the experimental shot peening of actual machine parts and laboratory specimens, and the testing of these parts and specimens with the cooperation of other laboratories. The effect of shot peening on the following properties was examined: (1) fatigue durability (2) impact (3) dimensions (4) balistic limit of armor plate and (5) stress corrosion cracking. Data are given in the form of individual case histories. The principal observations were: (1) improvement in fatigue durability in all cases (2) an indication that harder steels than usual might be used for springs if the process of shot peening is applied (3) resistance to impact unaffected at room temperature but greatly improved at -60 Deg. F. According to limited data (4) dimensional changes take place (5) a decrease in the ballistic limit of armor plate on the basis of very limited experiments and (6) an improvement in resistance to stress corrosion cracking of magnesium alloys. Discussions of shot peening apparatus, measuring apparatus, the type of shot used and general shot peening procedure are included. A section is devoted to an experiment which is in progress on the effect of shot peening on residual stress.