Environmentally Assisted Cracking of High Strength Beta Titanium Alloys PDF Download
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Author:
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Category :
Languages : en
Pages : 106
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Author:
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ISBN:
Category :
Languages : en
Pages : 106
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Author: Benjamin Floyd Brown
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ISBN:
Category : Aluminum alloys
Languages : en
Pages : 390
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Author: RA. Bayles
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Category : Composite materials
Languages : en
Pages : 24
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The role of hydrogen in the subcritical crack growth of titanium alloys is a subject of intense interest to those who use these alloys for structural applications. The most widely accepted theories are based on the absorption of hydrogen (in the case of environmental hydrogen-assisted cracking), its diffusion to regions of high tensile stress, and the initiation of microcracks at hydrides precipitated in such regions. One of the difficulties with such a mechanism is the paucity of observations of titanium hydrides on fracture surfaces, such as those caused by stress corrosion cracking or inert-environment sustained load cracking caused by residual hydrogen impurity. Another difficulty has been the identity in microstructural crack paths between stress corrosion cracking in hydrogen-containing (saltwater, etc.) and hydrogen-free (carbon tetrachloride) environments.
Author: Lisa M. Young
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Category :
Languages : en
Pages : 456
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Author: Yitong Shi
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Category :
Languages : en
Pages :
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Category :
Languages : en
Pages : 20
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A high-strength, a-precipitation hardened beta titanium alloy Ti-8V-6Cr-4Zr-4Mo-3Al, STA Beta C) is prone to intergranular environmentally assisted cracking (EAC) in neutral aqueous NaCl given an occluded crack, active crack tip strain rate and electrode potential near free corrosion. The threshold stress intensity for EAC is reduced to about one-third of the plane strain fracture toughness and subcritical crack growth rates are 30 to 100 micrometers/sec. STA Beta C is immune to EAC with static loading or sufficiently cathodic polarization. Lower strength solution treated Beta C resists EAC in both pure NaCl and acidic sulfur-species-bearing chloride solutions, where fracture is by transgranular microvoid formation. These results are consistent with findings for STA Beta 21S and are qualitatively understood based on hydrogen environment embrittlement. EAC propagation in STA Beta C exhibits slow-rapid oscillation under rising crack mouth opening displacement but not during constant rate loading. This result implies that stress intensity factor and crack tip strain rate interactively govern da/dt.
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Category : Steel alloys
Languages : en
Pages : 30
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Author: Edwin Lewis Owen
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Category : Stress corrosion
Languages : en
Pages : 306
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Author: R. W. Judy
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Category :
Languages : en
Pages : 30
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Author:
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Category : Aeronautics
Languages : en
Pages : 704
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