Stress corrosion crack (SCC) initiation of a solution annealed, cold-worked (CW) UNS N06600 (Alloy 600) material was investigated in 360 and 325°C simulated PWR primary water using constant load tensile instrumented for in-situ detection by the direct current potential drop technique. This CW material with high boron and low carbon bulk concentrations was found to be highly susceptible to SCC. Consistent SCC initiation times were obtained at both temperatures and the thermal activation energy for SCC initiation is estimated at ~116 kJ/mol.

Subject
Scanning electron microscopy, Materials, Yield stress, Metal surfaces, Gauges, Crack initiation, Activation energy, Surfaces, Stress cracking, Heat, Alloys, Cracks, Stress corrosion cracking
Keywords:
intergranular stress corrosion cracking, crack initiation, UNS N06600 (alloy 600), thermal activation energy
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2018
Association for Materials Protection and Performance (AMPP)
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