발간논문

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Vol.37, No.6, 680 ~ 686, 1999
Title
Research Paper / Mechanical Behavior : The Effects of Yield Stress on Delayed Hydride Cracking in Pressure Tube Materials
오제용Je Yong Oh, 김인섭In Sup Kim, 김영석Young Suk Kim
Abstract
The effects of yield stress on various parameters of Delayed Hydride Cracking (DHC) in pressure tube materials were investigated by experimental tests and by comparing with theoretical models. The DHC test and tension test were conducted at 200℃ for three kinds of zirconium alloys. As yield stress decreased, the threshold stress intensity factor and the striation spacing increased in one alloy, white fracture surfaces and striation were affected by microstructures in all alloys. The DHC velocity decreased as yield stress decreased. Hence, the DHC velocity was predictable by yield stress and DHC model. However, the predicted velocity was a little higher than measured velocity due to slight microstructural differences. The decrease in yield stress improved the resistance against DHC phenomena in pressure tube materials.
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