Journal ArticleDOI
A unified mechanism of stress corrosion and corrosion fatigue cracking
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In this article, a stress corrosion cracking (SCC) mechanism is proposed in which anodic dissolution at film rupture sites relieves strain hardening and reduces the fracture stress at the crack tip.Abstract:
A mechanism of stress corrosion cracking (SCC) is outlined in which anodic dissolution at film rupture sites relieves strain hardening and reduces the fracture stress at the crack tip. Experimental evidence is cited to suggest that relief of strain hardening occurs by interaction of subsurface dislocations with divacancies generated by the anodic dissolution. A transgranular crack propagates by accumulation of divacancies on prismatic planes which then separate by cleavage under plane strain conditions at the crack tip. At appropriate metallurgical and chemical conditions, anodic dissolution and/or divacancy migration may be enhanced at grain boundaries, leading to an intergranular failure mode. Evidence is also available to indicate that cyclic loading relieves strain hardening. Relief of strain hardening by combined cyclic loading and corrosion accounts for the higher incidence of corrosion fatigue cracking (CFC) without the requirement of any critical dissolved species. Data on fatigue of stainless steel at elevated temperature in both vacuum and air provide additional support for the proposed mechanism.read more
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Numerical simulations of hydrogen-dislocation interactions in fcc stainless steels. . part I: hydrogen-dislocation interactions in bulk crystals
TL;DR: In this paper, a numerical simulation method for the coupling between stress and hydrogen diffusion is proposed, based on the diffusion equation including a hydrostatic stress gradient term, and on a discretisation of the hydrogen concentration field.
Journal ArticleDOI
Numerical simulations of hydrogen–dislocation interactions in fcc stainless steels.: part II: hydrogen effects on crack tip plasticity at a stress corrosion crack
TL;DR: In this article, the discrete simulation method for hydrogen-dislocation interactions is applied to the study of stress Corrosion Cracking (SCC) in stainless steels.
Journal ArticleDOI
Mechanism of brittle fracture in a ductile 316 alloy during stress corrosion
TL;DR: In this article, a new physical model was proposed to explain the brittle transgranular cracking in a 153°C MgCl2 solution at free corrosion potential, based on the influence of localized anodic dissolution on the enhancement of the plasticity at the crack tip.
Journal ArticleDOI
A theory of transgranular stress-corrosion cracking
TL;DR: In this paper, a model is proposed to explain transgranular stress-corrosion cracking (T-SCC) in f.c. materials, wherein selective dissolution at the crack tip has the effect of lowering the KIc for cleavage.
References
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Book
Fundamentals of Physical Metallurgy
TL;DR: In this article, the authors present a review of Free-Energy Composition Diagrams (FECD) and a comparison with Massive Transformations (MT) for fcc and hcp materials.
Journal ArticleDOI
Stress Corrosion Cracking and Hydrogen Embrittlement of Iron Base Alloys
Journal ArticleDOI
Electrolytic Dissolution of Binary Alloys Containing a Noble Metal
H. W. Pickering,C. Wagner +1 more
TL;DR: In this paper, the ionization and redeposition of binary alloys, coupling of the anodic reactions in accordance with the concepts of irreversible thermodynamics, and volume diffusion in the presence of given supersaturations of single and double vacancies are analyzed theoretically.
Journal ArticleDOI
The theory of stress corrosion cracking in alloys
TL;DR: In this paper, stress corrosion cracking is a phenomenon that is of interest to a wide range of metal users when it occurs under service conditions, often without any prior indication of impeding failure, its effect may be catastrophic.
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