Abstract
The effect of hydrogen concentration on the delayed hydride cracking velocity (DHCV) and the threshold stress intensity factor, KIH of a Zr-2.5Nb tube were examined at test temperatures ranging from 100 to 280°C by subjecting compact tension specimens with a hydrogen concentration of 12 to 100 ppm H to an overtemperature cycle. The DHCV and KIH increased and decreased, respectively, with an increase in the supersaturated hydrogen concentration over the terminal solid solubility for dissolution (TSSD) or ΔC. They then leveled off to constant values at ΔC in excess of the ΔCmax corresponding to a difference of the terminal solid solubility of the hydrogen on cool-down and on heat-up. Further, intentional introduction of an undercooling by 0 to 40°C at the test temperature decreased the DHCV of the Zr-2.5Nb tube, indicating that ΔC between the bulk region and the crack tip governs the DHCV. A new DHC model is proposed where the driving force for DHC is the difference in the hydrogen concentration between the bulk region and the crack tip by preferentially nucleating the hydrides only at the crack tip under an applied tensile stress, due to a hysteresis in the TSS of hydrogen on heat-up and on cool-down. A supplementary experiment was conducted to validate the feasibility of the proposed DHC model.
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References
C. E. Coleman and J. F. R. Ambler,Zirconium in the nuclear industry, ASTM STP 633 (eds., A. L. Lowe Jr. and G. W. Parry), p. 589, ASTM (1977).
W. J. Pardee and N. E. Paton,Met. trans. A 11, 1391 (1980).
R. Dutton, K. Nuttal and M. P. Puls,Met. trans. A 8, 1533 (1977).
R. P. Gangloff and R. P. Wei,Met. trans. A 8, 1043 (1977).
R. W. Staehle,Proceedings of the 2 nd seminar on nuclear materials and related technology, p. 6–1, KAERI, Daejeon, Korea (1996).
R. M. Magdowski and M. O. Speidel,Met. trans. A 19, 1583 (1988).
M. P. Puls, L. A. Simpson, and R. Dutton,Fracture problems and solutions in the energy industry (ed., L.A. Simpson), p. 13, Pergamon press, Oxford (1982).
S. R. MacEwen, C. E. Coleman, C. E. Ells, and J. Faber,Acta metal. 33, 753 (1985).
S. Q. Shi and M. P. Puls,J. nucl. mater. 218, 30 (1994).
S. Q. Shi, G. K. Shek, and M. P. Puls,J. nucl. mater. 218, 189 (1995).
Z. L. Pan, I. G. Ritchie, and M. P. Puls,J. nucl. mater. 228, 227 (1996).
G. F. Slattery,J. inst. met. 95, 43 (1967).
J. J. Keams,J. nucl. mater. 22, 292 (1976).
J. F. R. Ambler,ASTM STP 824, 653 (1984).
F. H. Huang and W. J. Mills,Met. trans. A 22, 2049 (1991).
M. P. Puls,Acta metal. 32, 1259 (1984).
M. P. Puls,Hydrogen-induced delayed hydride cracking: 1. strain energy effects on hydrogen solubility, Atomic Energy of Canada Limited Report, AECL-6302 (1978).
Y. S. Kim, Characterization test procedures for Zr-2.5Nb tubes; Korea Atomic Energy Research Report, KAERI/TR-1329/99 (1999).
Y. B. Yun, Y. S. Kim, K. S. Im, Y. M. Cheong, and S. S. Kim,J. kor. nucl. soc. 35, 529 (2003).
S. Sagat, C. E. Coleman, M. Griffiths, and B. J. S. Wilkins,ASTM STP 1245, 35 (1994).
Y. S. Kim, S. S. Seon, and S. I. Kwun,J. Kor. Inst. Met. & Mater. 38, 35 (2000).
S. Q. Shi and M. P. Puls,J. nucl. mater. 218, 30 (1994).
C. E. Coleman and J. F. R. Ambler,Scripta metal. 17, 77 (1983).
K. Nuttal and A. J. Rogowski,J. nucl. mater. 80, 279 (1979).
J. F. R. Amber and C. E. Coleman,Hydrogen in metals, p. 3C10, Pergamon press, Oxford (1978).
C. E. Coleman and J. F. R. Ambler,Review of coatings and corrosion 3, 105 (1979).
G. K. Shek and D. B. Graham,ASTM STP 1023, 189 (1989).
W. M. Small, J. H. Root, and D. Khatamian,J. nucl. mater. 256, 102 (1998).
C. D. Cann and A. Atrens,J. nucl. mater. 88, 42 (1980).
Y. S. Kim, Y. Perlovich, M. Isaenkova, S. S. Kim, and Y. M. Cheong,J. nucl. mater. 297, 292 (2001).
S. Mishra and M. M. Asundi,ASTM STP 551, 63 (1974).
J. S. Bradbrook, G. W. Lorimer, and N. Ridley,J. nucl. mater. 42, 142 (1972).
J. H. Root, W. M. Small, D. Khatamian, and O. Woo,Acta mater. 51, 2041 (2003).
K. F. Amouzouvi and L. J. Clegg,Met. trans. A 18, 1687 (1987).
Y. S. Kim, S. J. Kim, and K. S. Im,J. nucl. mater. 367, 335 (2004).
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Kim, Y.S. Driving force for delayed Hydride cracking of zirconium alloys. Met. Mater. Int. 11, 29–38 (2005). https://doi.org/10.1007/BF03027481
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DOI: https://doi.org/10.1007/BF03027481