The primary objective of this task is to evaluate the effect of environmental and mechanical parameters on environment induced degradations of candidate target structural materials for applications in spallation-neutron-target systems, such as accelerator-driven systems for the transmutation of waste. The materials selected for evaluation and characterization are martensitic stainless steels including Alloys HT-9, EP-823 and Type 422 stainless steel (SS).
More recently, this experimental program has been expanded to evaluate the effect of molten lead-bismuth eutectic (LBE) on the corrosion behavior of target structural materials in the presence of oxygen. Since the Materials Performance Laboratory (MPL) at UNLV currently cannot accommodate this type of testing, the Delta loop, a molten LBE loop at the Los Alamos National Laboratory (LANL), is used to expose the stressed test specimens to evaluate the stress corrosion cracking (SCC), and localized corrosion behavior in the molten LBE environment. Since the magnitude of the applied load during these tests cannot be monitored or controlled (as in conventional SCC experiments) in the LBE environment, the test specimens will be self-loaded. Two types of specimen configurations, namely C-ring and U-bend, are used to perform these experiments. SCC tests using these types of self-loaded specimens are also being performed at the MPL in aqueous environments having neutral and acidic pH values at ambient and elevated temperatures.
Eutectic alloys; Hydrogen; Lead-bismuth alloys; Lead-bismuth eutectic; Martensitic stainless steel – Cracking; Materials – Cracking; Metals — Effect of high temperatures on; Particle accelerators; Radioactive wastes — Transmutation; Spallation (Nuclear physics); Stress corrosion; Tritium
Materials Chemistry | Materials Science and Engineering | Metallurgy | Nuclear Engineering | Oil, Gas, and Energy
Roy, A. K.
Environment-Induced Degradation and Crack-Growth Studies of Candidate Target Materials.
Available at: https://digitalscholarship.unlv.edu/hrc_trp_sciences_materials/50