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ASTM Selected Technical Papers
Mechanical Relaxation of Residual Stresses
By
L Mordfin
L Mordfin
1
United States Department of Commerce National Bureau of Standards Gaithersburg
,
Maryland
;
symposium chairman and editor
.
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ISBN-10:
0-8031-1166-5
ISBN:
978-0-8031-1166-0
No. of Pages:
129
Publisher:
ASTM International
Publication date:
1988

A systematic study was performed on the effectiveness of plastic deformation in tension and compression relief of residual stresses derived from the rapid quenching of 7075 aluminum. Maximum stress relief was observed after about 1.4% deformation in tension and 1 % deformation in compression. Complete stress relief could not be obtained from either mode of deformation. Stress relief was found to be more effective after deformation in tension than in compression. Significant differences in types and levels of residual stresses were found in specimens deformed seemingly uniform in compression when measured on a free surface, or on one in contact with the platen applying the compressive force. The effect of artificial aging as a supplement to mechanical stress relief also was investigated. The practical implications of the results, particularly with respect to forgings, are discussed. Recommendations are made for further work.

1.
Van Horn
,
K. R.
,
Aluminum, Vol. III, Fabrication and Finishing
,
American Society for Metals
,
Metals Park, OH
,
1967
, Chapter 10, pp. 355-382.
2.
Van Horn
,
K. R.
, “
Residual Stresses Introduced During Metal Fabrication
,”
Journal of Metals, Transactions
, American Institute of Mining and Metallurgical Engineers, Vol.
197
,
1953
, pp. 405-422.
3.
Barker
,
R. S.
and
Turnbull
,
G. K.
, “
Control of Residual Stresses in Hollow Aluminum Forgings
,”
Metal Progress
,
American Society for Metals
,
11
1966
, pp. 60-65.
4.
Jeanmart
,
P.
and
Bouvaist
,
J.
, “
Finite Element Calculation and Measurement of Thermal Stresses in Quenched Plates of High Strength 7075 Aluminum Alloys
,”
Materials Science and Technology
 0267-0836, Vol.
1
,
10
1985
, pp. 765-769.
5.
Boyer
,
J. C.
and
Boivin
,
M.
, “
Numerical Calculations of Residual Stress Relaxation in Quenched Plates
,”
Materials Science and Technology
 0267-0836, Vol.
1
,
10
1985
, pp. 786-792.
6.
Hsu
,
T. C.
, “
A Study of the Compression Test for Ductile Materials
,”
Materials Research and Standards
, Vol.
9
, No.
12
,
12
1969
, p. 20.
7.
Papirno
,
R.
in
Metals Handbook, Vol. 8, Mechanical Testing
,
American Society for Metals
,
1985
, pp. 55-58.
8.
Mescall
,
J.
,
Papirno
,
R.
, and
McLaughlin
,
J.
, “
Stress and Deformation States Associated with Upset Tests in Metals
,”
Compression Testing of Homogeneous Materials and Composites
, ASTM STP 808,
American Society for Testing and Materials
,
1983
, pp. 7-23.
9.
Dadras
,
P.
and
Thomas
,
J. F.
, “
Deformation Inhomogeneities in Upset Forging
,”
Compression Testing of Homogeneous Materials
, ASTM STP 808,
American Society for Testing and Materials
,
1983
, pp. 24-39.
10.
Papirno
,
R.
,
Mescall
,
J. F.
, and
Hansen
,
A. M.
, “
Fracture in Axial Compression Tests of Cylinders
,”
Compression Testing of Homogeneous Materials
, ASTM STP 808,
American Society for Testing and Materials
,
1983
, pp. 40-63.
11.
Aerospace Technical Information Bulletin
, “
Alcoa Stress-relieved Forgings
,” Aluminum Company of America, Series
68
, No. 2,
1968
.
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