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research-article

Effect of shot peening process on the fatigue life of shot peened low alloy steel

[+] Author and Article Information
Pham Quang Trung

Sustainable Developments in Civil Engineering Research Group, Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam, Room E001, 19 Nguyen Huu Tho Street, Tan Phong Ward, District 7, Ho Chi Minh City, Vietnam
phamquangtrung@tdt.edu.vn

Khun Nay Win

School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, N3.1-B2-01, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore
khunnaywin@yahoo.com

David Butler

School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, N3.2-01-19, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore
mdlbutler@ntu.edu.sg

1Corresponding author.

ASME doi:10.1115/1.4037525 History: Received November 08, 2016; Revised July 19, 2017

Abstract

Shot peening is well known as a surface deformation process which can induce compressive residual stresses into the subsurface of materials in order to improve the fatigue life. In this paper, the effects of the process conditions for both single and double shot peening on the fatigue life of AISI 4340 low alloy steel is investigated. The fatigue tests revealed that the shot peening process could significantly enhance the fatigue life of the treated components. However, a side effect of the process was an increase in surface roughness which was more prevalent under higher peening pressures and led to a reduction in the fatigue life. Therefore, to maximize the performance of the process, the peening parameters need to be carefully selected. Microstructure analysis of the shot peened parts indicated that the nucleation cracks or initiation cracks occurred in the subsurface at depths of 10 to 20 microns in the case of as-received samples but moved up to the free surface for the shot peened parts.

Copyright (c) 2017 by ASME
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