SEDL / STP / STP543-EB / STP38940S

Effects of Irradiation and Oxygen on Hydrogen Environment Embrittlement of Selected Alloys

Kesterson, RL
Engineer, Offshore Power Systems, Jacksonville, Fla.

Pages: 10    Published: Jan 1974

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Abstract

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.