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Research Papers

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,
Room E001, 19 Nguyen Huu Tho Street,
Tan Phong Ward, District 7,
Ho Chi Minh City 756636, Vietnam
e-mail: phamquangtrung@tdt.edu.vn

Nay Win Khun

School of Mechanical and
Aerospace Engineering,
Nanyang Technological University,
N3.1-B2-01,
50 Nanyang Avenue,
639798, Singapore
e-mail: khunnaywin@yahoo.com

David Lee Butler

School of Mechanical and
Aerospace Engineering,
Nanyang Technological University,
N3.2-01-19,
50 Nanyang Avenue,
639798, Singapore
e-mail: mdlbutler@ntu.edu.sg

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received November 8, 2016; final manuscript received July 19, 2017; published online September 13, 2017. Assoc. Editor: Ashraf Bastawros.

J. Eng. Mater. Technol 140(1), 011013 (Sep 13, 2017) (7 pages) Paper No: MATS-16-1325; doi: 10.1115/1.4037525 History: Received November 08, 2016; Revised July 19, 2017

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 10–20 μm in the case of as-received samples but moved up to the free surface for the shot peened parts.

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Figures

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Fig. 1

The geometry of the specimens used for all the experimental tests

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Fig. 2

(a) As-received, (b) S230-10, (c) S230-30, (d) S110-10, (e) S110-30, (f) DP-10-20, and (g) DP-30-20

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Fig. 3

Average areal roughness parameters (Sa) of the shot peened AISI 4340 steel samples as a function of shot peening pressure

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Fig. 4

The S–N curve of the as received AISI 4340 samples in the tension-compression axial loading fatigue tests

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Fig. 5

The fatigue life of shot peened samples under the maximum stress of 550 MPa

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Fig. 6

SEM micrographs showing the fatigue fracture surface of the as-received AISI 4340 samples at different magnifications: (a) overall view of the fracture surface, (b) the fatigue failure diagram, (c) close view of the initial defect at the magnification of 50 times, (d) close view of the first main initial fracture, (e) close view of the second main initial fracture, and (f) close view of the crack growth zone

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Fig. 7

SEM micrographs showing the fatigue fracture surface of the shot peened AISI 4340 samples at different magnifications: (a) and (b) overall view of the fracture surface, and (c) and (d) close view of the one main initial fracture of the S110-50 and S110-80 samples, respectively

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Fig. 8

SEM micrographs showing the fatigue fracture surface of the shot peened AISI 4340 samples at different magnifications: (a) and (b) overall view of the fracture surface, and (c) and (d) close view of the one main initial fracture of the S230-50 and S230-80 samples, respectively

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