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Effect of hydrogen on fracture and inert-environment sustained load cracking resistance of α- β titanium alloys

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Abstract

The fracture toughness and resistance to inert-environment sustained load crack propagation of α-β titanium alloys are usually reduced by increased hydrogen contents. The range of hydrogen contents over which either fracture toughness or threshold stress intensity for sustained load cracking was observed to decrease with hydrogen content is small (0 to 50 ppm) for Ti-6 Al-4 V, but further increases in hydrogen content can cause an increase in cracking rates. Sustained load crack propagation is characterized by a mixture of microvoid coalescence with cleavage, usually on a plane 12 to 15 deg from {0001} of the hep α phase with some {000l} cleavage. Cleavage apparently initiates ahead of the main crack front within a grains, usually near apparent α-β interfaces. Atmospheric moisture is inert with respect to sustained load cracking, that is, it does not cause stress corrosion cracking. Sustained load cracking was demonstrated in Ti-8 Al-1 Mo-1 V, Ti-6 Al-6 V-2 Sn, and several grades of Ti-6 Al-4 V.

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  1. U. S. Naval Research Laboratory, 20375, Washington D.C.

    D. A. Meyn (Research Metallurgist)

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Meyn, D.A. Effect of hydrogen on fracture and inert-environment sustained load cracking resistance of α- β titanium alloys. Metall Trans 5, 2405–2414 (1974). https://doi.org/10.1007/BF02644024

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