Cleavage cracking resistance of large-angle grain boundaries in Fe-3 wt% Si alloy

Argon, A. S.; Qiao, Y.

doi:10.1080/01418610210128096

Cited by 9 publications

(22 citation statements)

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“…In a recent study of the modes of cleavage crack transmission across specific bicrystal grain boundaries in a special Fe-3%Si alloy Argon and Qiao (2002) and Qiao and Argon (2003a) have measured the specific break-through resistances of 17 different high-angle boundaries with random combinations of tilt and twist misorientations and associated these measurements with measurements of fractographic features of these break-through processes. The resulting geometrically based boundary resistance model provided an excellent fit to the measured break-through resistances, taking the 17 boundaries as a whole.…”

Section: Introductionmentioning

confidence: 99%

Cleavage crack-growth-resistance of grain boundaries in polycrystalline Fe–2%Si alloy: experiments and modeling

Qiao

Argon

2003

Mechanics of Materials

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Experiments were carried out on the modes of advance of cleavage cracking through a field of randomly oriented grains at )30°C in the pure cleavage range (lower shelf) in very large grain size Fe-2%Si alloy, permitting detailed observations of the chronology of percolation of the cleavage crack front across a field of grains. Utilizing previously developed model-based information on the peak resistance to fracture of high angle grain boundaries, with a given tilt and twist misorientation across them, and detailed measurements of orientations of individual grains in the samples, it was possible to develop percolation maps of cleavage through the field of grains that for the initial phases of fracture through grains predicted the actual path with about 70% accuracy when compared with experimental observations. On the basis of these experiments and modeling a simple expression is projected for the effect of grain boundaries on the overall cleavage fracture resistance of low-carbon steel in the lower shelf region. The model gives a nearly 3-fold rise of cleavage resistance of the polycrystal over the single crystal, substantially independent of grain size. Additional experiments on decarburized 1010 steel of 50 lm grain size with an unusually low brittle-to-ductile transition temperature gave very similar results on the mode of percolation of cleavage cracking through grains even though in this case the cleavage propagation was under upper shelf conditions.

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Section: Introductionmentioning

confidence: 99%

Cleavage crack-growth-resistance of grain boundaries in polycrystalline Fe–2%Si alloy: experiments and modeling

Qiao

Argon

2003

Mechanics of Materials

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“…While most theoretical and computational studies have focused on elastic anisotropy [1][2][3], the anisotropy of the fracture toughness influences more strongly the crack propagation of a wide variety of materials including single crystals [4][5][6], extruded polymers [7], geological materials [8,9], including sedimentary [10] and granitic rocks [11], or apple flesh [12]. The issue of brittle crack propagation in materials with anisotropic surface energy deeply interrogates our understanding of fracture and is receiving increasing attention from a variety of points of view, such as molecular dynamics [13], continuum mechanics [14,15], phase-field modeling [16,17], and experiments [7,18].…”

Section: Introductionmentioning

confidence: 99%

Phase‐field modeling and simulation of fracture in brittle materials with strongly anisotropic surface energy

Peco

Millán

et al. 2014

Numerical Meth Engineering

165

102

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SUMMARYCrack propagation in brittle materials with anisotropic surface energy is important in applications involving single crystals, extruded polymers, or geological and organic materials. Furthermore, when this anisotropy is strong, the phenomenology of crack propagation becomes very rich, with forbidden crack propagation directions or complex sawtooth crack patterns. This problem interrogates fundamental issues in fracture mechanics, including the principles behind the selection of crack direction. Here, we propose a variational phase-field model for strongly anisotropic fracture, which resorts to the extended Cahn-Hilliard framework proposed in the context of crystal growth. Previous phase-field models for anisotropic fracture were formulated in a framework only allowing for weak anisotropy. We implement numerically our higher-order phase-field model with smooth local maximum entropy approximants in a direct Galerkin method. The numerical results exhibit all the features of strongly anisotropic fracture and reproduce strikingly well recent experimental observations.

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“…One was a very coarse-grained Fe-2%Si alloy to complement the previous investigation of the fracture resistance of individual grain boundaries (Argon and Qiao, 2002;.…”

Section: Methodsmentioning

confidence: 99%

“…In the as received material, there were small carbides of a size below 5 microns. To avoid undesirable interactions of such carbides with brittle crack propagation in the matrix, the material was annealed and decarburized according to a stringent schedule (Birks, 1969;Thelning, 1984) that had been used also in the earlier studies of Argon and Qiao (2002) and . The decarburization schedule consisted of first breaking-down the carbides by a prolonged period of 60 hours 1.…”

Section: Methodsmentioning

confidence: 99%

“…In a recent study on the modes of cleavage crack transmission across specific bicrystal grain boundaries in a special Fe-3%Si alloy Argon and Qiao (2002) and have measured the specific break-through resistances of 17 different high-angle boundaries with random combinations of tilt and twist misorientations and associated these measurements with measurements of fractographic features of these break-through process. The resulting geometrically-based boundary resistance model provided an excellent fit to the measured break-through resistance.…”

Section: As Seen In Figures 3 (A) and (B) § A4 Angle-dependent Facmentioning

confidence: 99%

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Brittle to Ductile Transition in Cleavage Fracture of Alpha-Iron: Experiments and Modeling of Mechanisms

Argon¹

2002

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Washington Headquarters Service, Directorate for Information Operations and Reports. 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188) Washington, DC 20503. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) 15- PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Massachusetts Institute of Technology 77 Massacusetts Avenue Cambridge, MA 02139 145 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Office of Naval Research, Materials Science Prg ONR Code 331 800 N. Quincy Street, Balston Tower 9 Arlington VA 22217-5000 SPONSOR/MONITOR'S ACRONYM(S) ONR SPONSORING/MONITORING AGENCY REPORT NUMBER 99R00006-01 DISTRIBUTION AVAILABILITY STATEMENTONR Program Officer Dr. George Yoder; Administrative Grants Office; Director NRL; DTIC Othrewise Unlimited 13. SUPPLEMENTARY NOTES ABSTRACTIn this research the mechanisms of the brittle to ductile transition of fracture initiated primarily by crack tip processes under both quasi-static as well as dynamic conditions was studied experimentally, and mechanistically modeled. Additional experiments and modeling included the role of grain boundariesin resisting cleavage cracking among grains in Fe-3%Si alloy, also associated with modeling. Reproduction in whole, or in part, is permitted for any purpose of the United States Government.This document has been approved for public release and sale, its distribution is unlimited. BRITTLE TO DUCTILE TRANSITION IN CLEAVAGE FRACTURE OF ALPHA-IRON: EXPERIMENTS AND MODELING OF MECHANISMS I. Summary of Research Carried out under the ProgramThe research results reported here in this final technical report are a continuation of an earlier program supported by the ONR Mechanics Division under Contract #N00014-92-J-4022 where the emphasis was on an experimental study of the brittle-to-ductile transition of fracture in silicon single crystals by thermal crack arrest and on modeling of dislocation emission from crack tips. Similarly, the research initiated under the ONR Program reported here, supported by the Materials Science Division and studying the role of grain boundaries in the crack growth resistance is now being continued under NSF support.The principal thrust in the completed research program under ONR support was on two experimental studies. One thrust was the completion of earlier research on the study of brittle to ductile fracture transition in silicon single crystals as stated above, while the second thrust was on a study of the role of grain boundaries in the enhancement of cleavage crack-gr...

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Cleavage cracking resistance of large-angle grain boundaries in Fe-3 wt% Si alloy

Cited by 9 publications

References 2 publications

Cleavage crack-growth-resistance of grain boundaries in polycrystalline Fe–2%Si alloy: experiments and modeling

Cleavage crack-growth-resistance of grain boundaries in polycrystalline Fe–2%Si alloy: experiments and modeling

Phase‐field modeling and simulation of fracture in brittle materials with strongly anisotropic surface energy

Brittle to Ductile Transition in Cleavage Fracture of Alpha-Iron: Experiments and Modeling of Mechanisms

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