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KMID : 0371819770090030117
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Nuclear Engineering and Technology
1977 Volume.9 No. 3 p.117 ~ p.123
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The Effect of Ageing Time and Temperature on the Strain Ageing Behaviour of Quenched Zircaloy-4
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Rheem, Karp Soon
Park, Won Koo/Yook, Chong Chul
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Abstract
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The strain ageing behaviour of quenched Zircaloy-4 has been studied as a function of ageing time and temperature in the temperature range 523 to 588 K for a short-ageing time of 1 to 52 seconds. At the test conditions, the strain ageing stress increased with ageing time and temperature at a strain rate of 5.55X10-4 sec-1. Applying stress on the quenched Zircaloy-4, the strain ageing effect indicated following two stages: an initial stage having an activation energy of 0.39 ev considered to be due to Snoek type ordering of intersitial oxygen atoms in the stress field of a dislocation and a second stage having an activation energy of 0. 60 ev, due to;mainly long-range diffusion of oxygen atoms.
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