발간논문

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Vol.38, No.1, 35 ~ 44, 2000
Title
Pesearch Paper / Mechanical Behavior : Characteristics of Delayed Hydride Cracking of Zr-2.5Nb Alloys
김영석Young Suk Kim,손승문Seung Moon Seon,김성수Sung Soo Kim,권숙인Sook In Kwun
Abstract
The objective of this study is to obtain better understanding of Delayed Hydride Cracking(DHC) of Zr-2.5Nb alloys. Three kinds of Zr-2.5Nb tubes with different yield strength and texture were subjected to DHC testing at temperatures ranging from 230-300℃ to investigate a DHC growth pattern, DHC velocity and an activation energy for DHC of Zr-2.5Nb alloys. Cantilever beam specimens of 38㎜ long with the notch of 0.5㎜ deep were subjected to charging of 50 to 200 ppm H at 400℃ and to homogenization treatment at 400℃ for 24 h while the DHC velocity was determined by an Acoustic Emission method. The DHC growth in the radial direction showed a zigzag pattern through cracking of hydrides reprecipitated preferentially on {1017} planes. The DHC velocity of these Zr-2.5Nb tubes was compared and discussed based on texture and strength. The DHC velocity showed no dependence on hydrogen content ranging from 50 to 150 ppm, whose activation energy was determined to be 70.7 kJ/㏖ for Tube A.
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