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University of Nevada, Las Vegas

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Las Vegas (Nev.)

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During the past two years (2001-2002) of this project, the primary effort was focused on evaluating the effect of hydrogen on the cracking behavior of candidate target materials namely, Alloys EP-823, HT-9 and 422 in aqueous environments of different pH values at ambient and elevated temperatures. More recently, emphasis is being placed to evaluate the cracking behavior of these materials in molten lead-bismuth eutectic (LBE) environment at much higher testing temperatures so as to compare the cracking susceptibility in environments containing molten metals and aqueous solutions, respectively. The most recent tests to evaluate the cracking susceptibility were primarily based on two state-of-the-art techniques known as constant-load and slow-strain rate (SSR) methods. Simultaneously, efforts were made to determine the localized corrosion (pitting and crevice corrosion) behavior in similar aqueous environments at ambient and elevated temperatures using electrochemical polarization techniques. However, these techniques cannot be applied to LBE environment. Therefore, the work scope described in the original proposal is being modified to include additional testing methods to suit the high-temperature LBE environment. Although, testing still will be continued to complete the original matrix involving all three alloys in aqueous environments using constant-load, SSR, and polarization techniques, future testing will be performed in both aqueous and LBE environments using self-loaded specimens such as C-Ring and U-Bend stress-corrosion-cracking (SCC) test specimens. In addition to this corrosion testing, significant efforts will be made to evaluate the crack-growth behavior of radiation hardened target materials using sub-size compact tension (CT) specimens. The test materials will undergo appropriate thermal treatments prior to their testing. All tested specimens will be examined metallographically. Further, the scanning electron microscopy (SEM) will be used to determine the extent and nature of cracking in the tested specimens. The thrust of this overall testing program is to evaluate the environmental and radiation effects on the cracking behavior of candidate target materials for applications in spallation-neutron-target (SNT) systems.


Eutectic alloys; Lead-bismuth alloys; Lead-bismuth eutectic; Hydrogen; Martensitic stainless steel – Cracking; Materials – Cracking; Metals — Effect of high temperatures on; Particle accelerators; Radioactive wastes — Transmutation; Spallation (Nuclear physics); Stress corrosion

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Eutectic alloys; Materials--Cracking; Radioactive wastes--Transmutation


Materials Chemistry | Materials Science and Engineering | Metallurgy | Nuclear Engineering | Oil, Gas, and Energy

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278 KB




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