Rapid solidification microstructures in austenitic FeNi alloys

Hayzelden, C.; Rayment, J.J.; Cantor, B.

doi:10.1016/0001-6160(83)90215-8

Cited by 57 publications

(8 citation statements)

References 15 publications

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“…The results are presented in Table II. As seen, at room temperature the alloy specimens consisted of the s-phase at Ni contents less than or equal to 25% or the y-phase at higher Ni contents, in agreement with the available literature data [2][3][4][5].…”

Section: Phase Compositionsupporting

confidence: 90%

Interaction of iron-nickel alloys with liquid aluminium

Dybkov

1993

J Mater Sci

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The dissolution of Fe-Ni alloys containing 90 to 5 mass % Fe in liquid aluminium at 700~ was found by the rotating-disc technique to be non-selective and diffusion controlled. Experimentally determined values of the saturation concentration (solubility), Cs, of iron and nickel from Fe-Ni alloys in the aluminium melt are presented. A dependence of the total iron and nickel concentration, Ctotal, in the saturated melt upon the iron content CFe, in initial Fe-Ni alloys could well be described by the linear equations: Ctotal = 7.51 -0.054CFe at 90% < CFe < 28% and Ctotal = 11.0 -0.19CFe at 28% < CFe < 5%. Considerable deviations of the concentration-time relationships from the Nernst-Shchukarev equation were revealed. The value of the dissolution rate constant was found to decrease by about 20 to 30%-in the 0 to Cs/2 iron or nickel concentration range. Accordingly, the decrease in value of the iron and nickel diffusion coefficient from an Fe-Ni alloy into liquid aluminium was 25 to 40%. For a 90% Fe-10% Ni alloy the value of the diffusion coefficient tends, with increasing iron and nickel concentration in the melt, to the value of the diffusion coefficient of pure iron in liquid aluminium. For other Fe-Ni alloys investigated, these values are less than or close to the diffusion coefficient of pure nickel in liquid aluminium.

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Section: Phase Compositionsupporting

confidence: 90%

Interaction of iron-nickel alloys with liquid aluminium

Dybkov

1993

J Mater Sci

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“…In fact, Clos et al [7] have claimed heating and cooling rates within the band of the order of 10 7 K/s and 10 6 K/s, respectively. This is likely a consequence of the fine austenite grain size which suppresses martensite formation, and previous work on binary Fe-Ni alloys using rapid solidification processing has in fact confirmed this to be the case for grain sizes less that about 1 m [44][45][46][47]; the grain size of austenite in the shear band in this study is of the order of 300 nm.…”

Section: Discussionsupporting

confidence: 74%

Dynamic deformation response of a high-strength, high-toughness Fe–10Ni–0.1C steel

Wang

Kumar

2009

Materials Science and Engineering: A

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“…It is interesting to note that the austenite did not revert back to martensite upon cooling although this material has a high hardenability and the heat extraction rate from the shear band is thought to be quite rapid. This is likely to be a consequence of the fine austenite grain size which suppresses martensite formation, and previous work on binary Fe-Ni alloys using rapid solidification processing has in fact confirmed this to be the case for grain sizes less that about one micrometer [21][22][23][24].…”

Section: Deformed Microstructure Following Dynamic Compression Deformmentioning

confidence: 91%

Microstructural Evolution during the Dynamic Deformation of High Strength Navy Steels

Kumar¹

2008

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Tihe public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing 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 aspec of this collection of information, including suggestions for reducing the burden, SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Office of Naval Research Regional Office Boston NA 495 Sumner Street Room 627Boston, MA 02210-2109 SPONSOR/MONITOR'S REPORT NUMBER(S) NA DISTRIBUTION/AVAILABILITY STATEMENTApproved for Public Release; Distribution is Unlimited SUPPLEMENTARY NOTES None ABSTRACTWe have characterized the propensity for adiabatic shear band formation (an associated microstructural evolution) under dynamic deformation conditions in an ultra-high strength (160 Ksi/1.1GPa) Fe-10 Ni-0.IC-Cr,Mo,V steel and demonstrated that this steel is highly prone to shear localization and failure. In the as-received condition, the steel has a lath martensite microstructure. During dynamic deformation, shear localization occurs and manifests by an optically visible shear band; the original microstructure is discernible within the band. With progression in severity of localization, there is evidence for a central region within the shear band composed of -300 nm size equiaxed grains constituting austenite, with a low dislocation content, and heavily twinned ferrite. In the extreme situation, a crack "chases" the shear band, and examination of the resulting fracture surfaces provides evidence for the presence of a thin liquid film layer. We have also observed that lowering the Ni content in the alloy significantly and adding Cu to the alloy, enables improvements in resistance to shear localization, both in terms of initiation and propagation of the shear band. SUBJECT TERMSadiabatic shear band formation, dynamic deformation, ultra-high strength 1ONi steel, microstructural evolution, lath martensite microstructure, shear localization Executive SummaryWe have characterized the propensity for adiabatic shear band formation under dynamic deformation conditions in an ultra-high strength (160 Ksi/1.IGPa) lONi steel and demonstrated that in spite of its outstanding static toughness, this steel is highly prone to shear localization and failure. Specifically, microstructural evolution during deformation of a Fe-10 Ni-0. 1 C-Cr,Mo,V steel was examined. In the as-received condition, the steel has a lath martensite microstructure, and during quasi-static deformation, shear appears to be accommodated by lath rotation and lath thinning. During dynamic deformation, shear localization occurs and manifests by an optically visible shear band. Initially, the original microstructure is discernible within the band. With progression in severity of localization, there is evidence for a central region within the shear band composed of -300 nm size equiaxed grains...

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Rapid solidification microstructures in austenitic FeNi alloys

Cited by 57 publications

References 15 publications

Interaction of iron-nickel alloys with liquid aluminium

Interaction of iron-nickel alloys with liquid aluminium

Dynamic deformation response of a high-strength, high-toughness Fe–10Ni–0.1C steel

Microstructural Evolution during the Dynamic Deformation of High Strength Navy Steels

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