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ASTM Selected Technical Papers
Analytical and Experimental Methods for Residual Stress Effects in Fatigue
By
RL Champoux
RL Champoux
1
Ceramic Binder Systems, Inc.
,
Butte, MT, symposium cochairman and co-editor
.
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JA Kapp
JA Kapp
2
U.S. Army Benet Laboratories
,
Watervliet, NY, symposium cochairman and co-editor
.
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JH Underwood
JH Underwood
3
U.S. Army Benet Laboratories
,
Watervliet, NY, symposium cochairman and co-editor
.
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ISBN-10:
0-8031-1195-9
ISBN:
978-0-8031-1195-0
No. of Pages:
142
Publisher:
ASTM International
Publication date:
1988

This paper presents the results of an experiment to determine the effect of elevated temperature on residual stresses present in, and the fatigue life of, shot peened 403 stainless steel. The first step involved testing simulated Almen A strips made from strip quench and tempered to 229–235 HB. The strips were shot peened to 8–10 A and subjected to temperatures ranging from 150 to 595°C (300 to 1100°F) for up to 1000 h. The amount of relaxation of the height of each sample was then measured at several intervals during the test. The data revealed that the change at 150°C (300°F) after 50 h was equal to that at 260°C (500°F). This drop was unexpected, as a review of available literature indicated residual stresses in carbon steel would not start to drop until 260°C (500°F), with stainless steels resistant to a much higher temperature. Measurement via x-ray diffraction showed the residual stress dropped from -529 MPa (-76.7 ksi) at room temperature to -269 MPa (-39 ksi) after exposure to 150°C (300°F) and to -112 MPa (-16.3 ksi) after exposure to 595°C (1100°F).

The second part of the paper presents the results of testing shot peened 403 stainless steel rotating beam fatigue test bars at room temperature, 260, and 400°C (500°F and 750°F). The data shows the endurance limit increases by 16 percentage points at room temperature and 6 percentage points at 260 and 400°C (500 and 750°F).

1.
Metals Handbook
. Eighth Edition, Vol.
2
, Heat Treating, Cleaning, and Finishing,
ASM International
, p. 403.
2.
Shot Peening for Improved Fatigue Properties and Stress-Corrosion Resistance
, MCIC-71-02,
Battelle Columbus Laboratories
,
1971
, p. 9.
3.
Shot Peening Applications
, 6Th Ed.,
Metal Improvement Company
, P. 34.
4.
Metals Handbook
, Ninth Edition, Vol.
5
, Surface Cleaning, Finishing, and Coating,
ASM International
, p. 146.
5.
1958 Tentative Guide for Fatigue Testing and Statistical Analysis of Fatigue Data
, STP 91-A, 2nd ed.,
American Society for Testing and Materials
,
Philadelphia
,
1963
.
6.
Childs
,
W.
 Jr.
, unpublished data.
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