Abstract
The delayed hydride cracking (DHC) behavior for ZIRCALOY-2 tubing was characterized at temperatures ranging from 93 °C to 288 °C. Testing was performed on the three types of pressure tubes that were used in the construction of the Hanford N Reactor, Richland, WA. A two-stage cracking response was observed for all tube types, with a very high K sensitivity in the threshold (stage I) regime followed by a region that was insensitive or moderately sensitive to the applied K level (stage II). The stage II crack velocity was a thermally activated process with an apparent activation energy of 68 kJ/mol. This energy level was consistent with the theoretical activation energy associated with hydrogen diffusion into the triaxial stress field ahead of a crack. Above a critical temperature of 180 °C, cracking occurred only when specimens were subjected to an overtemperature cycle. Below this critical temperature, DHC occurred regardless of whether specimens were heated or cooled to the test temperature. Differences in crack velocities and threshold responses for the various tube types were attributed primarily to variations in crystallo-graphic texture. Postirradiation testing revealed that irradiation to a fluence of 7.7 × 10(21) n/cm2 caused a 50-fold increase in crack growth rates. Metallographic and fractographic examinations were performed to understand operative DHC mechanisms.
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L.A. Simpson and CD. Cann:J. Nucl. Mater., 1979, vol. 87, pp. 303–16.
C.J. Simpson and C.E. Elis:J. Nucl. Mater., 1974, vol. 52, pp. 289–95.
A.H. Jackman and J.T. Dunn: Report No. AECL-5691, Atomic Energy of Canada Limited, Mississauga, ON, Canada, 1976.
E.C.W. Perryman:Nucl. Energy, 1978, vol. 17, pp. 95–105.
R. Dutton, K. Nuttall, M.P. Puls, and L.A. Simpson:Metall. Trans. A, 1977, vol. 8A, pp. 1553–62.
L.A. Simpson and K. Nuttall:Zirconium in the Nuclear Industry, ASTM STP 633, ASTM, Philadelphia, PA, 1977, pp. 608–29.
C.E. Coleman and J.F.R. Ambler:Zirconium in the Nuclear Industry, ASTM STP 633, ASTM, Philadelphia, PA, 1977, pp. 589–607.
E.G. Price and B.A. Cheadle:The Mechanism of Fracture, ASM, Metals Park, OH, 1985, pp. 511–19.
ASTM Standard E616-89, 1989Annual Book of ASTM Standards, ASTM, Philadelphia, PA, 1989, vol. 03.01.
L.A. Simpson and M.P. Puls:Metall. Trans. A, 1979, vol. 10A, pp. 1093–1105.
K. Nuttall:Scripta Metall., 1977, vol. 11, pp. 55–58.
W.J. Mills and F.H. Huang:Eng. Fract. Mech., 1991, vol. 39, pp. 241–57.
C.E. Coleman:Zirconium in the Nuclear Industry: 5th Conf, ASTM STP 754, ASTM, Philadelphia, PA, 1982, pp. 393–411.
M.P. Puls, L.A. Simpson, and R. Dutton:Fracture Problems and Solutions in the Energy Industry, Pergamon Press, New York, NY, 1982, pp. 13–25.
K.F. Amouzouvi and L.J. Clegg:Metall. Trans. A, 1987, vol. 18A, pp. 1687–94.
D.G. Westlake:J. Nucl. Mater., 1968, vol. 26, pp. 208–16.
L.A. Simpson and CD. Cann:J. Nucl. Mater., 1984, vol. 126, pp. 70–73.
C.E. Coleman, S. Sagat, and K.F. Amouzouvi:Proc. Int. Symp. on Fracture Mechanics, Pergamon Press, New York, NY, 1988, pp. 293–304.
J.F.R. Ambler:Zirconium in the Nuclear Industry: 6th Int. Symp., ASTM STP 824, ASTM, Philadelphia, PA, 1984, pp. 653–74.
B.A. Cheadle, C.E. Coleman, and J.F.R. Ambler:Zirconium in the Nuclear Industry: 7th Int. Symp., ASTM STP 939, ASTM, Philadelphia, PA, 1987, pp. 224–40.
J.F.R. Ambler and C.E. Coleman:2nd Int. Congress on Hydrogen in Metals, Pergamon Press, Oxford, U.K., 1978, Paper 3C10.
D.O. Northwood and U. Kasasih:Int. Mater. Rev., 1983, vol. 28, pp. 92–121.
M.P. Puls: Report No. AECL-8381, Atomic Energy of Canada Limited, Pinawa, MB, Canada, 1984.
M.P. Puls and A.J. Rogowski:Atomistics of Fracture, Plenum Press, New York, NY, 1983, pp. 789–94.
M.P. Puls:Acta Metall., 1984, vol. 32, pp. 1259–69.
R.A. Holt:J. Nucl. Mater., 1979, vol. 82, pp. 419–29.
J.J. Kearns: Report WAPD-TM-472, Westinghouse Electric Corporation, West Mifflin, PA, Nov. 1965.
D.B. Knorr and R.M. Pelloux:J. Nucl. Mater., 1977, vol. 71, pp. 1–13.
R. Ballinger and R.M. Pelloux:Mechanical Behavior of Materials, Pergamon Press, New York, NY, 1979, vol. 2, pp. 685–95.
J.E. Srawley:Int. J. Fract. Mech., 1976, vol. 12, pp. 475–76.
A. Saxena and S.J. Hudak, Jr.:Int. J. Fract., 1978, vol. 14, pp. 453–68.
ASTM Standard E399-83, 1989Annual Book of ASTM Standards, ASTM, Philadelphia, PA, 1989, vol. 03.01.
H.E. Kjarmo, H.E. Kissinger, L.A. Chariot, and E.R. Gilbert: Battelle Pacific Northwest Laboratory, Richland, WA, private communication, June 1988.
J.R. Rice:Stress Corrosion Cracking and Hydrogen Embrittlement of Iron Base Alloy, NACE, Houston, TX, 1973, pp. 11–15.
R. Dutton, C.H. Woo, K. Nuttall, L.A. Simpson, and M.P. Puls:2nd Int. Congress of Hydrogen in Metals, Pergamon Press, Oxford, U.K., 1978, paper 3C6.
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Formerly withWestinghouse Hanford Company
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Huang, F.H., Mills, W.J. Delayed hydride cracking behavior for ZIRCALOY-2 tubing. Metall Trans A 22, 2049–2060 (1991). https://doi.org/10.1007/BF02669872
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DOI: https://doi.org/10.1007/BF02669872