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Testing in 10-MPa (1500-psi) hydrogen did not reduce the notched strength of irradiated Inconel 718 or A286; however, irradiated Ti-5Al-2.5Sn suffered reductions in notched strength of 6.9 percent. Likewise, irradiated CW 301 stainless steel lost 81 percent of the notched strength in 10-MPa (1500-psi) hydrogen. For hydrogen pressures of 175 KPa (25 psi), impurity levels of 15-ppm oxygen do not seriously inhibit embrittlement of CW 301 stainless steel and a loss of 42 percent of notched strength is observed. With 150-ppm oxygen, the notched strength is reduced only 7.5 percent. Both Inconel 625 and molybdenum TZM were found to be subject to hydrogen embrittlement.
hydrogen embrittlement, irradiation, notch strength, notch tests, nuclear reactors, oxygen
Engineer, Offshore Power Systems, Jacksonville, Fla.