Accelerator Applications in a Nuclear Renaissance
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Three martensitic candidate target materials, namely Alloys EP-823 and HT-9, and Type 422 stainless steel have been tested to evaluate their susceptibility to stress corrosion cracking (SCC), hydrogen embrittlement (HE) and localized corrosion (pitting and crevice) in aqueous solutions of different pH values at ambient and elevated temperatures. The SCC behavior of smooth and notched tensile specimens was evaluated by using both constant-load and slow-strain-rate (SSR) testing techniques. The susceptibility to localized corrosion was determined by cyclic potentiodynamic polarization (CPP) method. The extent and morphology of cracking were analyzed by scanning electron microscopy (SEM). The results of SSR testing indicate that the time-to-failure, the percent elongation and the percent reduction in area were significantly reduced in the 90oC acidic solution. However, the magnitude of the true failure stress was increased in the presence of a notch due to a smaller area at the root of the notch. Constant-load SCC testing in the 90oC acidic solution showed cracking within 30 days. SEM micrographs of all broken specimens revealed intergranular brittle failure at the primary fracture face. The results of CPP experiments are currently being analyzed, that will be presented along with the overall test data.
Metals — Hydrogen embrittlement; Martensite – Stress corrosion; Steel alloys – Stress corrosion; Strains and stresses; Stress corrosion
Metals--Hydrogen embrittlement; Martensite; Steel alloys
Materials Science and Engineering | Mechanical Engineering | Mechanics of Materials | Metallurgy | Oil, Gas, and Energy
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Roy, A. K.,
Hossain, M. K.,
Accelerator Applications in a Nuclear Renaissance.