Abstract
Hydrogen compatibility of Ni-2ThO2, Ni-20Cr, Ni-20Cr-2ThO2, and Inconel MA753 was investigated with both hydrogen charging and tests in high-pressure hydrogen gas. The former were conducted at 194 as well as at room temperature. Ductility and fractography results showed that recrystallized Ni-20Cr-2ThO2 and MA753 were not embrittled by hydrogen, while Ni-2 ThO2 showed small ductility losses with no change in fracture morphology. Annealed Ni-20 Cr-2 ThO2 and as-received Ni-20 Cr-2 ThO2 showed no ductility losses in charged hydrogen, but showed large ductility losses in high-pressure hydrogen; no changes in fracture morphology were observed. Ni-20 Cr was markedly embrittled by both sources of hydrogen. These results support the hypothesis of Thompson and Wilcox, that the presence of a dispersoid can confer improved performance in hydrogen.
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Thompson, A.W. Hydrogen compatibility of dispersion-strengthened alloys. Metall Trans 5, 1855–1861 (1974). https://doi.org/10.1007/BF02644151
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DOI: https://doi.org/10.1007/BF02644151