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Abstract

The objective of this study is to investigate the reorientation of hydrides with applied stress intensity factor, the peak temperature and the time when to apply the stress intensity factor in a Zr-2.5Nb pressure tube during its thermal cycle treatment. Cantilever beam (CB) specimens with a notch of 0.5 mm in depth made from the Zr-2.5Nb tube were subjected to electrolytic hydrogen charging to contain 60 ppm H and then to a thermal cycle involving heating to the peak temperature of either 310 or $380^{\circ}C$, holding there for 50 h and then cooling to the test temperature of $250^{\circ}C$. The stress intensity factor of either 6.13 or $18.4\;MPa\sqrt{m}$ was applied at the beginning of the thermal cycle, at the end of the hold at the peak temperatures and after cooling to the test temperature, respectively. The reorientation of hydrides in the Zr-2.5Nb tube was enhanced with the increased peak temperature and applied stress intensity factor. Furthermore, when the CB specimens were subjected to $18.4\;MPa\sqrt{m}$ from the beginning of the thermal cycle, the reoriented hydrides occurred almost all over the Zr-2.5Nb tube, surprisingly suppressing the growth of a DHC crack. In contrast, when the CB specimens were subjected to the stress intensity factor at the test temperature, little reorientation of hydrides was observed except the notch region, leading the Zr-2.5Nb to grow a large DHC crack. Based on the correlation between the reorientation of hydrides and the DHC crack growth, a governing factor for DHC is discussed along with the feasibility of the Kim's DHC model.

참고문헌 (11)

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  3. S.J. Kim, Y.S. Kim, K.S. Im, S.S. Kim and Y.M. Cheong, 'Delayed Hydride Cracking of Zr-2.5Nb tubes with the Notch Tip Shape and Cooling Rate', J. Kor. Inst. Met. & Mater., 41, 21(2003) 
  4. Y.S. Kim, Y. Perlovich, M. Isaenkova, S.S. Kim and Y.M. Cheong, 'Precipitation of Reoriented Hydrides and Textural Change of a-Zirconium Grains during Delayed Hydride Cracking of Zr2.5%Nb Pressure Tube, J. Nucl. Mater., 297, 292 (2001) 
  5. Y.S. Kim et al., 'DHC Velocity and KIH of Zr-2.5Nb Tubes with Hydrogen', Journal of Metals, 55 (2), 383 (2003) 
  6. Y.S. Kim et al., 'A Manual for Characterization Tests for Zr-2.5Nb Pressure Tubes', KAERI Technical Report, KAERI/TR-1329/99 (1999) 
  7. J.J. Kearns, 'Terminal Solid Solubility and Partioning of Hydrogen in the Alpha Phases of Zirconium, Zircaloy-2 and Zircaloy-4, J. Nucl. Mater., 22, 292 (1967) 
  8. Z.L. Pan, M.P. Puls and I.G. Rithie, 'The Terminal Solid Solubility of Hydrogen and Deuterium in Zr-2.5Nb Alloys', J. Nucl. Mater., 228, 227(1996) 
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  10. D.J. Cameron and R.G. Duncan, 'On the Existence of A Memory Effect in Hydride Precipitation in Cold Worked Zr-2.5%Nb', J. Nucl. Mater., 68, 340 (1977) 
  11. V. Perovic, G.C. Weatherly, C.J. Simpson, 'Hydride Precipitation in ${\alpha}/{\beta}$ Zirconium Alloys', Acta Metall. 31, 1381(1983) 

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