Journal ArticleDOI
The Effects of Stress, Temperature and Hydrogen Content on Hydride-Induced Crack Growth in Zr-2.5 Pct Nb
L. A. Simpson,M. P. Puls +1 more
TLDR
In this article, the velocity of hydride induced subcritical crack growth in Zr-2.5 pct Nb has been determined using the potential drop method for measuring crack extension.Abstract:
The velocity of hydride induced subcritical crack growth in Zr-2.5 pct Nb has been determined using the potential drop method for measuring crack extension. A revised picture of the two-stage, crack velocity-stress intensity relationship has been obtained with a threshold stress intensity of 6 MPa·m1/2, independent of temperature. A consistent temperature dependence of the crack velocity has been determined for hydrided material but the velocity measurements in as-received material are unexpectedly high. A previous theoretical model has been improved. The improved model has provided a useful basis for explaining some of the present data which could not be rationalized in terms of the previous model. Criteria for the stepwise crack propagation behavior are discussed.read more
Citations
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Journal ArticleDOI
Hydrides and delayed hydrogen cracking in zirconium and its alloys
D. O. Northwood,U. Kosasih +1 more
TL;DR: A critical review of published data on hydrogen, hydrides, and delayed hydrogen cracking (or hydrogen-induced delayed cracking, HIDC) in zirconium and its alloys is presented in this paper.
Journal ArticleDOI
The precipitation of γ-hydride plates in zirconium
TL;DR: In this article, the authors considered the possibility that hydrides form by a displacive or shear transformation and determined the habit planes and orientation relationships of hydride alloys.
Journal ArticleDOI
Elastic and plastic accommodation effects on metal-hydride solubility☆
TL;DR: In this paper, a model that is capable of accounting for the hysteresis observed in the measured terminal solid solubilities (TSS) of metal hydride systems is presented.
Journal ArticleDOI
Effects of crack tip stress states and hydride-matrix interaction stresses on delayed hydride cracking
TL;DR: In this article, a model of slow crack propagation based on the delayed hydride cracking (DHC) mechanism was examined and evaluated to take account of recent experimental and theoretical advances in the understanding of hydrides fracture and terminal solid solubility (TSS).
Journal ArticleDOI
Fracture toughness of zirconium hydride and its influence on the crack resistance of zirconium alloys
L.A. Simpson,C.D. Cann +1 more
TL;DR: In this article, the fracture toughness of hydride-containing zirconium alloys was investigated over the temperature range of 20 to 300°C on both hydrided Zr-2.5%Nb and hydrides of Zr 2.5%.
References
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Journal ArticleDOI
Inelastic Behavior of Solids
TL;DR: In the case of the salmon, the danger of prejudicing future population studies by the artificial transfer of fish from one area to another was highlighted by the authors of the meeting as well as guidelines to future work as mentioned in this paper.
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Terminal solubility and partitioning of hydrogen in the alpha phase of zirconium, zircaloy-2, and zircaloy-4.
TL;DR: In this article, the effects of alloy composition, grain size and cold work on the terminal solubility and thermodynamic activity of hydrogen in the alpha phase of zirconium, Zircaloy-2, and Zircaleroy-4 were determined by a diffusion sample method.
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The dilatational misfit of zirconium hydrides precipitated in zirconium
TL;DR: In this paper, the unconstrained misfit strains associated with the formation of zirconium hydride precipitates in Zr have been calculated with respect to directions.
Journal ArticleDOI
Mechanisms of hydrogen induced delayed cracking in hydride forming materials
TL;DR: In this article, a quantitative model for hydrogen cracking in Zr-2.5 pct Nb is presented and compared with available experimental data, showing that the process occurs in an intermittent fashion; hydride clusters accumulate at the crack tip followed by unstable crack advance and subsequent crack arrest in repeated cycles.