The influence of material and applied stress on stress corrosion cracking (SCC) were evaluated to ≈ 18,500 hours on candidate waste package materials for the Yucca Mountain Project. Time-to-failure experiments were being performed on smooth bar tensile specimens in a hot, concentrated, mixed-salt solution chosen to simulate concentrated Yucca Mountain water. The effects of applied stress, welding, surface finish, shot peening, cold work, crevicing, and aging treatment are investigated for Alloy 22 (UNS N06022). Aging treatments were designed to produce topologically close-packed phases (TCP) and long-range ordering (LRO) as worse-case scenarios for possible microstructures in Alloy 22. Titanium Grade 7 and type 316NG stainless steel were also included in the matrix, as they were also being considered for drip shield and waste package components, respectively. Sensitized type 304 stainless steel was evaluated to provide benchmark data.

Subject
Materials, Stainless alloys, Autoclaves, Manifolds, Notches, Stress, Mechanical failure, Titanium, Stainless steel, Titanium alloys, Alloys, Wastes, Stress corrosion cracking
Keywords:
Stress corrosion cracking, crack initiation, constant load, alloy 22, titanium alloys, stainless steel, concentrated groundwater, welding, shot peening
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2004
Association for Materials Protection and Performance (AMPP)
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