Critical Temperatures for Initiating and Arresting Delayed Hydride Cracking in a Zr-2.5Nb Pressure Tube

Young Suk Kim; Kyung Soo Im; Yong Moo Cheong

doi:10.4028/www.scientific.net/KEM.297-300.1685

Paper Titles

Alternative Fatigue Evaluation of Nuclear Piping Designed by ANSI B31.1 Code
p.1659

Analysis Technology on the Temperature and Thermal Stress of the Cask for Radioactive Material Transport
p.1666

Determination of the Key Microstructural Parameter for the Cleavage Fracture Toughness of Reactor Pressure Vessel Steels in the Transition Region
p.1672

Surface Crack Behavior in Socket Weld of Nuclear Piping under Fatigue Loading Condition
p.1678

Critical Temperatures for Initiating and Arresting Delayed Hydride Cracking in a Zr-2.5Nb Pressure Tube
p.1685

Evaluation of the Fracture Characteristics with Thermal Aging on Dissimilar Welds in Reactor Coolant System
p.1691

Annealing Effect of Thermal Conductivity on Thermal Stress Induced Fracture of Nuclear Graphite
p.1698

Plastic Limit Load Solutions for Surface Crack in the Steam Generator Tubes
p.1704

The Mechanical Property of TiN Film Deposited on N+-Implanted Aluminum by Magnetron Sputtering
p.1713

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Critical Temperatures for Initiating and Arresting Delayed Hydride Cracking in a Zr-2.5Nb Pressure Tube

Abstract:

The hydrogen concentration limit and critical temperatures for a delayed hydride cracking (DHC) in zirconium alloys have been reanalyzed using Kim’s DHC model that a driving force for DHC is not the stress gradient but the supersaturated hydrogen concentration or ∆C arising from a hysteresis of the terminal solid solubility on a heating and on a cooling. The DHC initiation occurs generally at the temperatures corresponding to the terminal solid solubility for precipititation (TSSP), demonstrating that the supercooling from the terminal solid solubility for dissolution (TSSD) is required to initiate the DHC. The DHC arrest temperatures correspond to the temperatures where the ∆C is reduced to zero. Therefore, we conclude that the ∆C is the driving force for the DHC and that the Kim’s DHC model is feasible.