Abstract

The toughness of quenched 4340 steel (American Iron and Steel Institute designation) has been studied as a function of notch root radius and tempering temperature for several testing conditions (such as room temperature slow-bend Charpy, room temperature instrumented Charpy). The toughness, the square root of the fracture initiation energy, and the specimen deflection at fracture initiation follow similar trends under identical conditions in each type of testing. Thus fracture initiation energy and the specimen deflection in Charpy testing can be measures of toughness. These three macroscopic relationships are independent of fracture morphology, grain size, or plastic zone size. Theoretical relationships among the three are proposed.

Issue Section:
Research Papers
Keywords:
steels, mechanical properties, toughness, fractures (materials), deflection, Charpy test, initiation energy

References

1.
Datta
,
K. P.
 and
Wood
,
W. E.
, in
Fractography in Materials Science
, STP 733,
American Society for Testing and Materials
, Philadelphia,
1981
, in press.
2.
Bucci
,
R. J.
,
Paris
,
P. C.
,
Landes
,
J. D.
, and
Rice
,
J. R.
, in
Fracture Toughness
, STP 514,
American Society for Testing and Materials
,
Philadelphia
,
1972
, pp.
40
-
69
.
3.
Knot
,
J. F.
,
Journal of the Iron and Steel Institute
, Vol.
204
,
02
1966
, pp.
104
-
111
.
4.
Wih
,
F. S.
, in
Conference on Practical Application of Fracture Mechanics to Pressure-Vessel Technology
,
Institution of Mechanical Engineers
,
London
,
1961
, p. 163.
5.
Greenberg
,
H. D.
,
Wessel
,
E. T.
, and
Pryle
,
W. A.
,
Engineering Fracture Mechanics
 0013-7944, Vol.
1
, No.
4
,
04
1970
, pp.
653
-
674
.
Crossref
Search ADS
 
6.
Carten
,
H. T.
 and
Sailors
,
R. H.
, Technical Report 15,
University of Illinois
, Urbana,
08
1971
.
7.
Barsom
,
J. M.
 and
Rolfe
,
S. T.
, in
Impact Testing of Metals
, STP 466,
American Society for Testing and Materials
,
Philadelphia
,
1970
, pp.
281
-
302
.
8.
Lai
,
G. Y.
,
Wood
,
W. E.
,
Clark
,
R. A.
,
Zackay
,
V. F.
, and
Parker
,
E. R.
,
Metallurgical Transactions
 0026-086X, Vol.
5
, No.
7
,
07
1974
, pp.
1663
-
1670
.
Crossref
Search ADS
 
9.
Server
,
W. L.
,
Ireland
,
D. R.
, and
Wullaert
,
R. A.
, “
Strength and Toughness Evaluations From an Instrumented Impact Test
,” TR 74-29R,
Effects Technology Inc.
,
Santa Barbara, Calif.
,
11
1974
.
10.
Succop
,
G.
,
Bubsey
,
R. T.
,
Jones
,
M. H.
, and
Brown
,
W. F.
, Jr., in
Developments in Fracture Mechanics Test Methods Standardization
, STP 632,
American Society for Testing and Materials
,
Philadelphia
,
1977
, pp.
153
-
178
.
11.
Rau
,
C. A.
, Jr., “
The Effect of Drilled Holes on Notch Toughness
,” Ph.D. thesis,
Materials Science Department, Standford University
, Stanford, Calif.,
04
1967
.
12.
Rice
,
J. R.
,
Corrosion
 0010-9312, Vol.
32
, No.
1
,
01
1976
, pp.
22
-
26
.
This content is only available via PDF.
All rights reserved. This material may not be reproduced or copied, in whole or in part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of ASTM International.
You do not currently have access to this content.