Abstract
Delayed hydride cracking (DHC) tests were conducted on a cold-worked Zr–2.5Nb tube with hydrogen at different test temperatures ranging from 100 to 350 °C. Striation spacing corresponding to a critical hydride length increased with temperature, demonstrating that hydride cracking resistance is enhanced with temperature. Nonetheless, the crack growth rate (CGR) had a positive temperature dependence below 300 °C, showing that at temperatures below 300 °C, the CGR is governed by diffusion-controlled hydride growth. At higher temperatures above 300 °C, however, the CGR decreased rapidly, suggesting that the CGR is dictated not by the hydride growth rate but by the hydride cracking rate. This suggestion is evidenced by experiments where the threshold stress intensity factor for DHC or KIH increased sharply above 300 °C.
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