Iranian Journal of Manufacturing Engineering

Iranian Journal of Manufacturing Engineering

Experimental study and statistical analysis of the effect of ultrasonic shot peening on the microhardness of the cross section of steel samples

Document Type : Original Article

Authors
Amin Omidi Hashjin 1
Mahdi Vahdati 2
Rezvan Abedini 3
1 MSc Graduate, Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
2 Assistant Professor, Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
3 Assistant Professor, Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
10.22034/ijme.2024.470535.1990
Abstract
Ultrasonic shot peening (USP) is used as a surface treatment to create work-hardening on the surfaces of the parts. In this process, spherical shots with a certain size, type and number are moved by a vibrating object (horn) and hit the surface of the workpiece. On the other hand, stainless steel plays an important role in the development of manufacturing technologies due to its high strength and oxidation resistance. Therefore, in this research, the USP process was performed on 316L stainless steel, and the effect of ultrasonic power and shot peening duration on the cross-sectional microhardness of the samples was evaluated at two depths of 75 and 250 microns. The results showed that by applying the USP, the microhardness of the cross section at the depths of 75 and 250 microns increases by a maximum of 43.37% and 18.5% compared to the raw sample, respectively. Therefore, by increasing the depth from the shot-treated surface, the effect of the USP decreased by 57.34%. The ANOVA results also showed that the ultrasonic power in both depths is known as the most effective input variable and in the depth of 250 microns, the effect of the ultrasonic power is greater than the duration of shot peening. Also, dual-objective optimization was done to achieve the maximum hardness in both depths using the desirability method, and the optimal values of the ultrasonic power and shot peening duration were equal to 100% and 195 seconds, respectively, with a desirability value of 87%.
Keywords
Ultrasonic Shot Peening
Compressive Residual Stress
Microhardness
ANOVA
Optimization
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Iranian Journal of Manufacturing Engineering
Volume 11, Issue 7 - Serial Number 81
September 2024
Pages 46-52