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ASTM Selected Technical Papers
Impact Testing of Metals
By
DE Driscoll
DE Driscoll
1
Chief
, Quality Assurance Division,
Army Materials and Mechanics Research Center
,
Watertown, Mass. 02172
;
symposium chairman
.
Search for other works by this author on:
ISBN-10:
0-8031-0739-0
ISBN:
978-0-8031-0739-7
No. of Pages:
321
Publisher:
ASTM International
Publication date:
1970

Studies involving the application of the instrumented Charpy impact test are presented. The studies were concerned with the effect of strain rate, alloying, and irradiation on the ductile-brittle transition temperature (DBTT) and fracture behavior of pressure vessel steels.

The effect of strain rate on a 0.02C and 0.02C-3.5Ni steel was evaluated by comparing instrumented Charpy tests with three-point slow bend tests on Charpy V-notch specimens. Increasing the strain rate (1) increased the DBTT, (2) increased the yield stress, and (3) decreased the temperature dependence of the yield stress. The strain rate sensitivity of the yield stress was mainly responsible for the increase in the DBTT.

The instrumented Charpy test was used to determine why small nickel additions to steel are so effective in lowering the ductile-brittle transition temperature. The decrease in the DBTT was shown to be related to the decrease in the strain rate and temperature dependence of the yield stress produced by nickel.

The effect of irradiation on A212-B steel was evaluated by use of the instrumented Charpy impact test. Irradiating A212-B steel at approximately 260 C to a fluence of 9.4 × 1018 n/cm2 (>1 Mev) increased the DBTT 56 C. Irradiation increased the dynamic yield stress 30 percent but reduced the strain rate sensitivity of the yield stress. The increase in the ductile-brittle transition temperature was shown to be almost entirely due to the radiation-induced increase in the dynamic yield stress.

1.
Wilshaw
,
T. R.
and
Pratt
,
P. O.
, “
The Effect of Temperature and Strain Rate on the Deformation and Fracture of Mild-Steel Charpy Specimens
,”
Proceedings of the First International Conference on Fracture
,
Sendai, Japan
,
09
1965
, Vol.
2
, p. 973.
2.
Tetelman
,
A. S.
and
McEvily
,
A. J. R.
,
Fracture of Structural Materials
,
Wiley
,
New York
,
1967
.
3.
Wullaert
,
R. A.
, “
The Effect of Nickel on the Microstructure and Mechanical Properties of Low Carbon Ferritic Steels
,” Ph.D. dissertation,
Stanford University
, Stanford, Calif.,
05
1969
.
4.
Knott
,
J. F.
, “
Some Effects of Hydrostatic Tension on the Fracture Behaviour of Mild Steel
,” Ph.D. dissertation,
University of Cambridge
, Cambridge, England,
1962
.
5.
Fearnehough
,
G. D.
and
Hoy
,
C. J.
, “
Mechanism of Deformation and Fracture in the Charpy Test as Revealed by Dynamic Recording of Impact Loads
,”
Journal of the Iron and Steel Institute
, Vol.
202
,
11
1964
, p. 912.
6.
Hill
,
R.
,
Mathematical Theory of Plasticity
, Oxford, London,
1950
.
7.
Wilshaw
,
T. R.
, “
The Effect of Temperature and Strain Rate on the Deformation and Fracture of Mild Steel Charpy Specimens
,” Ph.D. dissertation,
University of London
, London, England,
1965
.
8.
Stone
,
D. E. W.
and
Turner
,
C. E.
, “
Brittle Behaviour in Laboratory-Scale Mechanical Testing
,”
Proceedings, Royal Society
, Vol.
A285
,
1965
, p. 83.
9.
Knott
,
J. F.
, Discussion Meeting regarding Ref ,
Proceedings, Royal Society
, Vol.
A285
,
1965
, p. 150.
10.
Green
,
A. P.
and
Hundy
,
B. B.
, “
Initial Plastic Yielding in Notch Bend Tests
,”
Journal of the Mechanics and Physics of Solids
 0022-5096, Vol.
4
,
1965
, p. 128.
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