The Effect of Hydrogen on the Multiaxial Stress-strain Behavior of Titanium Tubing PDF Download

Author: Charles William Lentz
Publisher:
ISBN:
Category :
Languages : en
Pages : 104

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Author: C. W. Lentz
Publisher:
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Category : Titanium
Languages : en
Pages : 27

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Book Description
The influence of internal hydrogen on the multiaxial stress-strain behavior of commercially pure titanium has been studied. Thin-walled tubing specimens containing either 20 or 1070 ppm hydrogen have been tested at constant stress ratios in combined tension and internal pressure. The addition of hydrogen lowers the yield strength for all loading paths but has no significant effect on the strain hardening behavior at strains epsilon>or= 0.02. thus, the hydrogen embrittlement of titanium under plain strain or equibiaxial loading is not a consequence of changes of flow behavior. The yielding behavior of this anisotropic material is described well by Hill's quadratic yield criterion. As measured mechanically and by pole figure analysis, the plastic anisotropy changes with deformation in a manner which depends on stress state. Hill's criterion and the associated flow rule do not describe the multiaxial flow behavior well because of their inability to account for changes of texture which depend on multiaxial stress path. Hence, a strain dependent, texture-induced strengthening effect in equibiaxial tension is observed, this effect having the form of an enhanced strain hardening rate.

Author:
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Category : Aeronautics
Languages : en
Pages : 836

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Author:
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Category : Power resources
Languages : en
Pages : 506

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Author: B. J. Lograsso
Publisher:
ISBN:
Category :
Languages : en
Pages : 10

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The influence of hydrogen on the deformation and fracture of three Ti alloys in the form of sheet has been examined as a function of the state of stress. Unnotched sheet specimens of alpha-phase Ti ( -60, 630, and 980 ppm H), Beta-phase Ti-30V ( -40 and 2000 ppm H), and alpha-Beta Ti-6Al-4V (30, 240, and 500 ppm H) have been investigated over deformation paths ranging from uniaxial to equibiaxial tension. Based on the measurements of the local fracture strains, the alpha-Ti data show a decrease in ductility with increasing hydrogen content as the degree of biaxiality of the tensile strain increases. Thus hydrogen embrittlement of Ti sheet is most severe under equibiaxial straining. In contrast, there is no pronounced effect of stress state on the localized necking and fracture behavior of either the Ti-30V or the Ti-6Al-4V at any of the hydrogen levels/microstructures examined. The results indicate that, even in equibiaxial tension, Ti alloys in the form of sheet are immune to hydrogen embrittlement if hydrides do not form. If hydrides are present, the embrittlement is most pronounced under those state of stress (e.g., plane strain and equibiaxial tension) which are characterized by large normal stresses.

Author: V. G. Gavriljuk
Publisher: Springer Nature
ISBN: 3030985504
Category : Technology & Engineering
Languages : en
Pages : 298

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This book analyzes the effect of hydrogen on the atomic-level interactions in metals, detailing the corresponding changes in the physical properties of crystal lattice defects, diffusion, and phase transformations in metallic materials as a result of hydrogen loading. It presents a novel derivation of the structure of stacking faults, the mobility of dislocations, and short-range atomic order in hydrogen-infused metallic alloys based on the change in the concentration of free electrons. It reviews the current hypotheses behind hydrogen embrittlement of iron-, nickel, and titanium-based alloys, focusing on the phenomenon of hydrogen-enhanced localized plasticity and taking into account inherent atomic states in the alloys and other effects due to hydrogen loading. Finally, the book analyzes the use of hydrogen as an interim alloying element in the technological processing of titanium alloys, discussing the necessary preconditions for hydrogen-enhanced plasticity of metals. This book is an excellent resource for graduate students, academic researchers, and practicing engineers involved in the development of advanced hydrogen-resistant metallic materials.

Author: Los Alamos National Laboratory
Publisher:
ISBN:
Category : Research
Languages : en
Pages : 192

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Author: United States. Department of Energy. Office of Basic Energy Sciences
Publisher:
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Category : Conservation of natural resources
Languages : en
Pages : 192

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Author:
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Category : Aeronautics
Languages : en
Pages : 1020

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Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 632

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Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.