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TECHNICAL PAPERS

Surface Modification and Fatigue Behavior of High-Pressure Oil Jet-Peened Medium Carbon Steel, AISI 1040

[+] Author and Article Information
A. Sahaya Grinspan

Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600 036, India

R. Gnanamoorthy1

Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600 036, Indiagmoorthy@iitm.ac.in

1

Corresponding author.

J. Manuf. Sci. Eng 129(3), 601-606 (Sep 07, 2006) (6 pages) doi:10.1115/1.2673626 History: Received March 16, 2006; Revised September 07, 2006

Introduction of compressive residual stresses on the fatigue-loaded components is one of the techniques followed to improve the fatigue life of industrial components. Oil jet peening is a surface modification process for the introduction of compressive residual stresses. A high-pressure oil jet is made to impinge on the surface to be peened. Preliminary studies were carried out on the medium carbon steel at the oil pressure of 50MPa. The compressive residual stress induced on the surface of unpeened and oil jet-peened AISI 1040 steel was 21MPa and 200MPa, respectively. Fully reversed cantilever bending fatigue behaviors of medium carbon steel in both under peened and unpeened conditions were evaluated at room temperature. Oil jet-peened specimens exhibited superior fatigue performance compared to the unpeened specimens. Fractographical analyses were carried out for specimens broken at several tested stress levels using optical microscope.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Basic principle of oil jet peening

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Figure 2

Schematic representation of specimen geometry, clamping arrangement, surface treatment, and location of residual stress measurement area: (a) nozzle traveling pattern (not to scale) and (b) X-ray diffraction measurement region

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Figure 3

Schematic representation of fatigue specimen and surface treatment: (a) geometry of bending fatigue specimen and (b) surface treatment pattern followed (not to scale) (all dimensions are in millimeter)

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Figure 4

Force applied to the fatigue specimen

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Figure 5

Residual stress distribution in the specimens peened at a pressure of 50MPa and SOD 25mm

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Figure 6

Surface hardness variation during oil jet peening at different SODs

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Figure 7

Typical micrographs both oil jet peened and unpeened surfaces of AISI 1040 steel specimens: (a) unpeened, (b) peened SOD 15mm, (c) peened SOD 25mm, and (d) peened SOD 40mm

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Figure 8

Photograph of peened region in the fatigue specimen

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Figure 9

S-N diagram for the unpeened and peened AISI 1040 steels

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Figure 10

Typical micrograph of the crack initiation site in the oil jet-peened specimens tested at a stress level of 520MPa (arrow shows the origin of crack initiation)

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Figure 11

Fractographs of unpeened and peened specimens at several tested stress levels: (a) unpeened, stress=520MPa, Nf=4.3×104, (b) peened, stress=520MPa, Nf=6.2×104, (c) unpeened, stress=480MPa, Nf=8.1×104, (d) peened, stress=480MPa, Nf=12.1×104, (e) unpeened, stress=420MPa, Nf=16.4×104, (f) peened, stress=420MPa, Nf=41.3×104

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