Abstract

To assure adequate fracture resistance of cryogenic pressure vessels designed to operate at a minimum design metal temperature (MDMT) colder than 77 K (−196 °C or −320 °F), current American Society of Mechanical Engineers (ASME) Code, Section VIII, Division 1, UHA-51 Impact Test rule requires that the weld metal (WM) meets or exceeds 0.53 mm (21 mils) lateral expansion at 77 K, i.e., LE77K ≥ 0.53 mm (21 mils), as determined using Charpy V-notch (CVN) impact testing. To the credit of this rule, cryogenic pressure vessels fabricated to date meeting the above requirement had continued to serve well—without any adverse incident—in numerous applications across the world, at cryogenic temperatures colder than 77 K. However, a critical examination of the underlying research which relied on a regression equation relating ratio of fracture toughness to yield strength obtained at 4 K, i.e., [KIc/YS]4K with LE77K, revealed that the technical basis for establishing the above requirement is metallurgically unsustainable. To successfully overcome this, the present research employed dimensional analysis and balancing of the previously published regression equations and proposed [KIc/YS]277K as a valid fracture resistance parameter applicable for MDMT 77 K and warmer, as well as MDMT colder than 77 K. Related efforts offered equivalent fracture resistance as an insightful concept, wherein the minimum fracture resistance parameter for a MDMT colder than 77 K is equated as a simple multiple of the minimum fracture resistance parameter at 77 K MDMT. Concluding efforts applied numerical analysis to the equivalent fracture resistance equation to reaffirm the current minimum 0.53 mm (21 mils) CVN LE77K requirement for WM when MDMT is colder than 77 K and to identify minimum required [KIc/YS]277K values for cryogenic service at MDMT 77 K and warmer, and MDMT colder than 77 K. Inherently, the use of [KIc/YS]277K as a fracture resistance parameter offers a tremendous benefit to cryogenic equipment manufacturers, particularly in schedule and cost savings, as LE, KIc, and YS measured at 77 K can be used to successfully assess the fracture resistance at MDMT 77 K and warmer, as well as MDMT colder than 77 K.

References

1.
ASTM
,
2015
, “
Standard Test Method for Measurement of Fracture Toughness
,” ASTM International, West Conshohocken, PA, Standard No.
ASTM
E1820-15.10.1520/E1820-16
2.
ASTM
,
1996
, “
Test Method for J-Integral Characterization of Fracture Toughness
(Withdrawn 1998),” ASTM International, West Conshohocken, PA, Standard No. ASTM E1737-96.
3.
ASTM
,
1989
, “
Test Method for JIc, A Measure of Fracture Toughness
(Withdrawn 1997),” ASTM International, West Conshohocken, PA, Standard No. ASTM E813-89.
4.
ASTM
,
2012
, “
Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness KIc of Metallic Materials
,” ASTM International, West Conshohocken, PA, Standard No.
ASTM
E399-12.10.1520/E0399
5.
Hwang
,
I.
,
Morra
,
M.
,
Ballinger
,
R.
,
Nakajima
,
H.
,
Shimamoto
,
S.
, and
Tobler
,
R. L.
,
1992
, “
Charpy Absorbed Energy and JIc as Measures of Cryogenic Fracture Toughness
,”
J. Test. Eval.
,
20
(
4
), pp.
248
258
.10.1520/JTE11720J
6.
Tobler
,
R. L.
,
Reed
,
R. P.
,
Hwang
,
I. S.
,
Morra
,
M. M.
,
Ballinger
,
R. G.
,
Nakajima
,
H.
, and
Shimamoto
,
S.
,
1991
, “
Charpy Impact Tests Near Absolute Zero
,”
J. Test. Eval.
,
19
(
1
), pp.
34
40
.10.1520/JTE12527J
7.
ASME Boiler and Pressure Vessel Code-Section VIII
,
2013
, “
Division 1—Pressure Vessels
,” American Society of Mechanical Engineers International, New York, p.
214
.
8.
Rana
,
M. D.
,
Doty
,
W. D.
,
Yukawa
,
S.
, and
Zawierucha
,
R.
,
2000
, “
Fracture Toughness Requirements for ASME Section VIII Vessels for Service Temperatures Colder Than 77 K
,”
ASME J. Pressure Vessel Technol.
,
123
(
3
), pp.
332
337
.10.1115/1.1376125
9.
Rana, M. D., Zawierucha, R. and Watkins, W. R., 1997, “
Structural Integrity Assessment of a Cracked Type 201 Stainless Steel Head of a Cryogenic Pressure Vessel
,”
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
,
346
, pp. 59–68.
10.
Read
,
D. T.
,
McHenry
,
H. I.
,
Steinmeyer
,
P. A.
, and
Thomas
,
R. D.
, Jr.
,
1980
, “
Metallurgical Factors Affecting the Toughness of 316L SMA Weldments at Cryogenic Temperatures
,”
Weld. J. Res. Suppl.
,
59
(
4
), pp.
104s
113s
.
11.
Mazandarany
,
F. N.
,
Parker
,
D. M.
,
Koenig
,
R. F.
, and
Read
,
D.
,
1980
, “
A Nitrogen-Strengthened Austenitic Stainless Steel for Cryogenic Magnet Structures
,”
Advances in Cryogenic Engineering Materials
, Vol.
26
,
Springer
,
New York
, pp.
158
170
.
12.
McHenry
,
H. I.
,
Read
,
D. T.
, and
Steinmeyer
,
P. A.
,
1979
, “
Evaluation of Stainless Steel Weld Metals at Cryogenic Temperatures
,”
Materials Studies for Magnetic Fusion Energy Applications at Low Temperatures-II
, Vol.
NBSIR 79-1609
,
F. R.
Fickett
, and
R. P.
Reed
, eds.,
National Bureau of Standards
,
Boulder, CO
, pp.
299
312
.
13.
Sampath
,
K.
,
2005
, “
Constraints Based Modeling Enables Successful Development of a Welding Electrode Specification for Critical Navy Applications
,”
Weld. J. Res. Suppl.
,
84
(
8
), pp.
131s
138s
.
14.
Sampath
,
V.
,
Kehl
,
J.
,
Vizza
,
C.
,
Varadan
,
R.
, and
Sampath
,
K.
,
2008
, “
Metallurgical Design of High-Performance GMAW Electrodes for Joining HSLA-65 Steel
,”
J. Mater. Eng. Perform.
,
17
(
6
), pp.
808
830
.10.1007/s11665-008-9236-2
15.
Kane
,
S. F.
,
Farland
,
A. L.
,
Siewert
,
T. A.
, and
McCowan
,
C. N.
,
1999
, “
Welding Consumable Development for a Cryogenic (4K) Application
,”
Weld. J. Res. Suppl.
,
78
(
8
), pp.
292s
300s
.
16.
Whipple
,
T. A.
, and
Kotecki
,
D. J.
,
1981
, “
Weld Process Study for 316L Stainless Steel Weld Metal for Liquid Helium Service
,”
Materials Studies for Magnetic Fusion Energy Applications at Low Temperatures-IV
, Vol.
NBSIR 81-1645
,
R. P.
Reed
, and
N. J.
Simon
, eds.,
National Bureau of Standards
,
Boulder, CO
, pp.
303
321
.
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