Threshold stress intensity factor of delayed hydride cracking in irradiated and unirradiated zircaloy-4 cladding

2021 ◽  
Vol 543 ◽  
pp. 152596
Author(s):  
Jong-Dae Hong ◽  
Myungchul Park ◽  
Anna-Maria Alvarez Holston ◽  
Johan Stjärnsäter ◽  
Donghak Kook
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Threshold Stress ◽  
Threshold Stress Intensity ◽  
Delayed Hydride Cracking ◽  
Threshold Stress Intensity Factor ◽  
Hydride Cracking

Threshold Stress Intensity Factor for Delayed Hydride Cracking of a Recrystallized N18 Alloy Plate Along the Rolling Direction

2010 ◽  
Author(s):  
Chao Sun ◽  
Shi H. Ying ◽  
Jun Tan ◽  
Qian Peng ◽  
Xun Dai
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Threshold Stress ◽  
Rolling Direction ◽  
Threshold Stress Intensity ◽  
Alloy Plate ◽  
Delayed Hydride Cracking ◽  
Threshold Stress Intensity Factor ◽  
Hydride Cracking

The objective of this study is to obtain the threshold stress intensity factor, KIH, for an initiation of delayed hydride cracking (DHC) in a recrystallized N18 (Zr-1.05Sn-0.27Nb) alloy plate which was manufactured in China, gaseously charged with 60ppm of hydrogen by weight. By using both the load increasing method (LIM) and load drop method (LDM), the KIH’s along the rolling direction were investigated over a temperature range of 150–255°C. The results showed that KIH along the rolling direction was found to be higher in the LIM than that in the LDM. In the LIM, KIH’s of the N18 alloy plate appeared to be in the range of 31–32.5 Mpa·m1/2, and KIH in the LDM appeared to be in the range of 27.5–28.6 Mpa·m1/2. This means that the N18 alloy plate has high tolerance for DHC initiation along the rolling direction. The texture of a N18 alloy plate was investigated using an X-ray diffraction (XRD) and the KIH was discussed based on texture and analytically as a function of the tilting angle of hydride habit planes to the cracking plane.

Temperature Dependence of Threshold Stress Intensity Factor, KIH in Zr-2.5Nb Alloy and Its Effect on Temperature Limit for Delayed Hydride Cracking

2006 ◽  
Vol 326-328 ◽  
pp. 919-922 ◽  
Author(s):  
Young Suk Kim ◽  
Sang Bok Ahn ◽  
Kang Soo Kim ◽  
Yong Moo Cheong
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Threshold Stress ◽  
Tensile Tests ◽  
Temperature Limit ◽  
Threshold Stress Intensity ◽  
Delayed Hydride Cracking ◽  
Threshold Stress Intensity Factor ◽  
Hydride Cracking

Threshold stress intensity factor or KIH required to initiate a delayed hydride crack in the axial direction of a Zr-2.5Nb tube was determined at temperatures of 160 oC to 280 oC. KIH remained constant at temperatures from 160 to 250 oC, increased with an increasing temperature in excess of 280 oC using a load decreasing method. To correlate KIH and dislocation twins, tensile tests were conducted on the Zr-2.5Nb tube and textural changes during tensile tests were investigated using an X-ray diffractometer. The extent of the twins increased from 150 to 300 oC and then decreased at temperatures in excess of 300 oC with no twins occurring at 350 oC. Temperature dependencies of KIH and a temperature limit for delayed hydride cracking were discussed with cracking of hydrides by the twins. This study provides supportive evidence to the feasibility of Kim’s DHC model.

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