The aim of this study was to obtain a better understanding of delayed hydride cracking (DHC) of Zr-2.5Nb pressure tube with crack growth direction. DHC tests were conducted at temperatures ranging form 160~280℃ on Curved Compact Tension (CCT) and Ca...
The aim of this study was to obtain a better understanding of delayed hydride cracking (DHC) of Zr-2.5Nb pressure tube with crack growth direction. DHC tests were conducted at temperatures ranging form 160~280℃ on Curved Compact Tension (CCT) and Cantilever Beam (CB) specimens with 60 ppm H to determine the threshold stress intensity factor, K1H in axial and radial directions of the Zr-2.5Nb tube, respectively. Over a temperature range of 160~250℃, K1H for the Zr-2.5Nb tube 5.84 ㎫ √m in the axial direction and 8.4 ㎫ √m in the radial direction, both of which were constant independent of temperatures, However, at 280℃, K1H increased unexpectedly to a higher value. Based on the results, K1H for Zr-2.5Nb tube is discussed with the orientation, hydride habit plane and a supersaturated concentration of hydrogen.