Abstract
The tensile, fatigue crack growth, and fracture toughness properties of Fe—49Ni were determined at room temperature, 76 K, and 4 K. The test material was 10-cm-thick, 25-cm-wide billet in the hot-rolled and ground condition having the following chemistry (in wt. %): 47.5 Ni, 0.012 C, 0.33 Mn, 0.25 Si, and the balance Fe. Transverse tensile properties were determined with 25-mm-gauge length, 6.4-mm-diameter specimens using the methods described previously by Reed [1]. Fatigue crack growth rates in the transverse orientation (TL) were determined with 25-mm-thick, 51-mm-wide compact tensile specimens using the compliance method for crack length determinations; the test procedures and equipment were described previously by Fowlkes and Tobler [2]. Fracture toughness in the TL orientation was determined with 25-mm-thick, 51-mm-wide compact tensile specimens using the J-integral test procedures of Landes and Begley [3] and the cryogenic testing procedures and equipment described previously by Tobler et al. [4].
Supported by the Advanced Research Projects Agency.
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Abbreviations
- a:
-
crack length
- A:
-
area under the load-displacement curve in a J test
- B:
-
specimen thickness
- C:
-
empirical coefficient in the crack growth equation
- da/dn:
-
crack growth per load cycle in fatigue
- E:
-
elastic modulus
- J:
-
J-integral value
- J IC :
-
critical value of J for crack initiation
- K IC :
-
plane strain fracture toughness
- K IC (J):
-
K IC determined from J IC
- n:
-
empirical exponent in crack growth equation
- R:
-
coefficient of determination
- W:
-
specimen width
- Δa :
-
increment of crack extension
- ν:
-
Poisson’s ratio
- σƒ :
-
flow strength
- σ tu :
-
ultimate tensile strength
- σ ty :
-
0.2% offset yield strength
References
R. P. Reed, in Advances in Cryogenic Engineering, Vol. 7, Plenum Press, New York (1962), p. 448.
C. W. Fowlkes and R. L. Tobler, Eng. Fract. Mech. 8:487 (1976).
J. D. Landes and J. A. Begley, “Test Results for J-Integral Studies—An Attempt to Establish a J IC Testing Procedure,” Westinghouse Research Laboratory Scientific Paper 73-IE-7-FMPWR-P3, Pittsburgh, Pennsylvania (1973).
R. L. Tobler, R. P. Mikesell, R. L. Durcholz, and R. P. Reed, in Properties of Materials for Liquefied Natural Gas Tankage, ASTM STP 579 (1975), p. 261.
R. P. Reed, National Bureau of Standards, Boulder, Colorado, unpublished data.
J. R. Rice, P. C. Paris, and J. G. Merkle, in Progress in Flaw Growth and Fracture Toughness Testing, ASTM STP 536 (1973), p. 231.
J. A. Begley and J. D. Landes, in Fracture Toughness, ASTM STP 514 (1972), p. 1.
H. M. Ledbetter, National Bureau of Standards, Boulder, Colorado, unpublished data.
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McHenry, H.I., Schramm, R.E. (1978). Note on the Fracture Properties of Fe-49Ni at Cryogenic Temperatures. In: Timmerhaus, K.D., Reed, R.P., Clark, A.F. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 24. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9853-0_15
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DOI: https://doi.org/10.1007/978-1-4613-9853-0_15
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