SYMPOSIA PAPER Published: 01 January 1984
STP34499S

Effect of Direction of Approach to Temperature on the Delayed Hydrogen Cracking Behavior of Cold-Worked Zr-2.5Nb

Source

The delayed hydrogen cracking behavior of cold-worked Zr-2.5Nb at temperatures above about 423 K depends upon the direction of approach to test temperature. Cooling to the test temperatures results in an increase in crack growth rate, da/dt, with increase in temperature, given by the following Arrhenius relationship da/dt = 6.86 × 10−1 exp(−71500/RT) Heating from room temperature to the test temperature results in the same increase in da/dt with temperature, but only up to a certain temperature, TDAT. The temperature, TDAT, increases with the amount of hydride precipitated during cooling to room temperature, prior to heating, and with cooling rate. The results obtained can be explained in terms of the Simpson and Puls model of delayed hydrogen cracking, if the hydride precipitated at the crack tip is initially fully constrained and the matrix hydride loses constraint during heating.

Author Information

Ambler, JFR
Atomic Energy of Canada, Ltd., Metallurgical Engineering Branch, Chalk River Nuclear Laboratories, Chalk River, Ont., Canada
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Details
Developed by Committee: B10
Pages: 653–673
DOI: 10.1520/STP34499S
ISBN-EB: 978-0-8031-4895-6
ISBN-13: 978-0-8031-0270-5