Direct observation and analysis of crack propagation in iron-3% silicon single crystals

Tetelman, A. S.; Robertson, W. D.

doi:10.1016/0001-6160(63)90166-4

Cited by 138 publications

(42 citation statements)

References 2 publications

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“…Notice however that in Figure 3b the slip planes must form a kink in order to accommodate the deformation. Experiments in Fe-3% Si crystals [16] show results consistent with kink-like shear. This kink requires dislocation dipoles as in Fig.…”

Section: Note On Role Of S and Nmentioning

confidence: 58%

“…1 la is sometimes observed in fatigue studies on ductile Cu and A1 crystals, whereas the b cc crack orientation noted to coincide with Fig. 1 lb is a common cleavage crack orientation, e.g., in Fe-3% Si crystals [16]. The term go in (8) is the critical resolved shear stress in the xl, x2 plane of deformation for the double slip model.…”

Section: Center Crack Panel Resultsmentioning

confidence: 90%

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Crack tip fields in ductile crystals

1990

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Abstract.Results on the asymptotic analysis of crack tip fields in elastic-plastic single crystals are presented and some preliminary results of finite element solutions for cracked solids of this type are summarized. In the cases studied, involving plane strain tensile and anti-plane shear cracks in ideally plastic fc c and b c c crystals, analyzed within conventional small displacement gradient assumptions, the asymptotic analyses reveal striking discontinuous fields at the crack tip.For the stationary crack the stress state is found to be locally uniform in each of a family of angular sectors at the crack tip, but to jump discontinuously at sector boundaries, which are also the surfaces of shear discontinuities in the displacement field. For the quasi-statically growing crack the stress state is fully continuous from one near-tip angular sector to the next, but now some of the sectors involve elastic unloading from, and reloading to, a yielded state, and shear discontinuities of the velocity field develop at sector boundaries. In an anti-plane case studied, inclusion of inertial terms for (dynamically) growing cracks restores a discontinuous stress field at the tip which moves through the material as an elastic-plastic shock wave. For high symmetry crack orientations relative to the crystal, the discontinuity surfaces are sometimes coincident with the active crystal slip planes, but as often lie perpendicular to the family of active slip planes so that the discontinuities correspond to a kinking mode of shear.The finite element studies so far attempted, simulating the ideally plastic material model in a small displacement gradient type program, appear to be consistent with the asymptotic analyses. Small scale yielding solutions confirm the expected discontinuities, within limits of mesh resolution, of displacement for a stationary crack and of velocity for quasi-static growth. Further, the discontinuities apparently extend well into the near-tip plastic zone. A finite element formulation suitable for arbitrary deformation has been used to solve for the plane strain tension of a Taylor-hardening crystal panel containing, a center crack with an initially rounded tip. This shows effects due to lattice rotation, which distinguishes the regular versus kinking shear modes of crack tip relaxation, and holds promise for exploring the mechanics of crack opening at the tip.

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Section: Note On Role Of S and Nmentioning

confidence: 58%

Section: Center Crack Panel Resultsmentioning

confidence: 90%

Crack tip fields in ductile crystals

1990

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“…In early studies relying on the observation of the dislocation etch-pit patterns around hydrogen-induced cracks in Fe-Si single crystals, Robertson and co-workers [35,36] reported transgranular crack propagation along the typical {001} cleavage planes. On the other hand, using X-ray trace analysis during HICC testing of several grades of purified iron, Bernstein observed transgranular cracking along the {110} and {112} slip planes while the {001}…”

Section: Crack Propagation Planesmentioning

confidence: 99%

“…In order to resolve the apparent contradiction between Refs [35,36] and [37], Nakasato and Bernstein [38] performed a systematic study of HICC in purified iron and a series of Fe-Si alloys (with Si content up to 3%). X-ray trace analysis revealed a complete transition from slip plane cracking (at 0% Si) to cleavage plane cracking (at 3% Si) with increasing silicon content; a mixture of both modes was obtained at 0.7% Si.…”

Section: Crack Propagation Planesmentioning

confidence: 99%

Investigation of the effect of electrolytic hydrogen charging of X70 steel: II. Microstructural and crystallographic analyses of the formation of hydrogen induced cracks and blisters

Saleh

Hejazi

Gazder

et al. 2016

International Journal of Hydrogen Energy

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Pereloma, E. V. (2016). Investigation of the effect of electrolytic hydrogen charging of X70 steel: II. Microstructural and crystallographic analyses of the formation of hydrogen induced cracks and blisters. International Journal of Hydrogen Energy, 41 (28), 12424-12435. Investigation of the effect of electrolytic hydrogen charging of X70 steel: II. Microstructural and crystallographic analyses of the formation of hydrogen induced cracks and blisters AbstractHydrogen-induced cold cracking and blistering in hydrogen-charged X70 steel was found to be highly dependent on microstructure, with the banded ferrite-pearlite microstructure of hot rolled strip showing a higher susceptibility than other microstructures produced by different thermal-mechanical routes. Although crack initiation was particularly sensitive to microstructure, crack growth occurred largely parallel to the rolling plane, at least at a macroscopic level, for all of the microstructures investigated. The crack plane was associated with structural anisotropy arising from processing by rolling and was not found to be related to a preferred grain orientation. At a microstructural level, crack propagation was mostly transgranular and occurred dominantly along slip planes of the ferrite grains. Cracks were initiated at strong traps in the microstructure when the hydrogen and local stress concentrations reached critical levels for hydrogeninduced fracture. The main initiation sites were coarse inclusions, mainly oxides, and ferrite-pearlite interfaces. Keywords: X70 pipeline steel, electrolytic hydrogen charging, hydrogen-induced cold cracking (HICC), effect of microstructure, crystallography of cracking, effect of grain texture.

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“…Zapffe first pro- (6) posed the "pressure theory" which was then subsequently modified by many other researchers including Tetelman and Robertson (7), (8).…”

Section: Introductionmentioning

confidence: 99%

Hydrogen permeation through annealed zone-refined iron by using electrochemical charging at room temperature

Shih¹

1975

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Direct observation and analysis of crack propagation in iron-3% silicon single crystals

Cited by 138 publications

References 2 publications

Crack tip fields in ductile crystals

Crack tip fields in ductile crystals

Investigation of the effect of electrolytic hydrogen charging of X70 steel: II. Microstructural and crystallographic analyses of the formation of hydrogen induced cracks and blisters

Hydrogen permeation through annealed zone-refined iron by using electrochemical charging at room temperature

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