Effect of hydrogen on fracture and inert-environment sustained load cracking resistance of α- β titanium alloys |
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Authors: | D A Meyn |
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Affiliation: | (1) U. S. Naval Research Laboratory, 20375 Washington D.C. |
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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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