Thickening kinetics of proeutectoid ferrite plates in Fe-C alloys

Kinsman, K. R.; Eichen, E.; Aaronson, H.I.

doi:10.1007/bf02667284

Cited by 166 publications

(50 citation statements)

References 26 publications

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“…The calculations suggested that the sluggish thickening and eventual growth stasis observed experimentally for proeutectoid cementite grain boundary films in the Fe-1?16C alloy 42 could be attributed to a drastic decrease and eventual cessation of ledge production -or alternatively, a drastic increase in interledge spacing -at late reaction times. 95 It was also pointed out 95 that similar increases in interledge spacing with time had been experimentally observed for other precipitation reactions during plate thickening 107,108 and plate coarsening, 109,110 including the absence of growth ledges at long reaction times being shown to result in the complete cessation of plate thickening in Al-15Ag. 108 Along these lines, Ando and Kraus performed somewhat similar ledge growth calculations to suggest that an increase in interledge spacing with time could also be at least partially responsible for the observed sluggish cementite grain boundary film growth kinetics observed in their Fe-1?06C-2?26Cr-0?03Si alloy.…”

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confidence: 61%

The proeutectoid cementite transformation in steels

Σπανός¹,

Kral²

2009

International Materials Reviews

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A comprehensive, critical, and up to date review is presented for the proeutectoid cementite transformation in steels. It is believed that many of the new findings, features, and concepts presented here for this classic phase transformation in steels serve as a model which may be more broadly applicable to test against many other phase transformations systems as well. There were a number of early investigations of cementite morphology, and this review considers those early results in light of many newer studies that provide critical new insight into cementite morphologies in both two and three dimensions. A number of different orientation relationships (ORs) between proeutectoid cementite and the austenite matrix from which it forms have been reported in the literature, in some cases leading to confusion, and they are critically evaluated here, as are the habit plane, growth direction, and interfacial structure of various morphologies of proeutectoid cementite. Quantitative experimental and theoretical investigations of the growth kinetics of the proeutectoid cementite transformation are considered next, and the nucleation site of proeutectoid cementite in austenite is also discussed in some detail. This review considers all of these issues in a critical way in which differences, commonalities, important features, and redundancies are sorted out, in order to present a unified picture that will add some clarity to this subject. The different features and issues of this transformation that are considered in detail throughout this review are finally brought together in a comprehensive way in the last major section of this paper on 'Formation mechanism(s) of proeutectoid cementite', in order to provide a complete, modern view of the formation of proeutectoid cementite from austenite. To the best knowledge of the present authors, before this review a thorough assessment of this classic phase transformation in steels had not been undertaken since 1962, when Professor Hubert I. Aaronson covered this topic in a section of the book entitled 'The Decomposition of Austenite by Diffusional Processes'.1 In large part due to a number of ground breaking new findings on the proeutectoid cementite transformation since then (particularly in the last decade), it is very timely for a new review on this topic.

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confidence: 61%

The proeutectoid cementite transformation in steels

Σπανός¹,

Kral²

2009

International Materials Reviews

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“…Contrast changes observed by the CSLM during solidstate phase transformations are a result of topographical changes caused by surface deformation due to the displacive [18][19][20] and/or dilatometric nature of the phase transformations, surface diffusion leading to smoothing of the surface, 21) or the formation of non-metallic phases (liquid or solid oxides, sulfides, etc.) on the surface.…”

Section: High Temperature Confocal Scanning Laser Microscopymentioning

confidence: 99%

The Austenite/Ferrite Front Migration Rate during Heating of IF Steel

et al. 2006

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The austenitization of interstitial free (IF) steel was investigated through real time imaging of evolving surface relief structures through a hot-stage confocal scanning laser microscope. Nucleation was observed at grain edges but site saturation did not occur. As expected the, the migration rate was found to be controlled by an interface reaction and the rate was, within the experimental errors, nearly indistinguishable between IF steels, pure Fe and previously reported rates for pure Fe with activation energies between 174-180 kJ/ mol. There was no apparent effect of solute drag caused by the trace solute elements in the IF steel, but the non-metallic oxide and nitride particles present in the IF steel appeared to impede the front migration and caused it to become jagged in appearance.KEY WORDS: confocal scanning laser microscopy (CSLM); austenitization; interstitial free (IF) steel; interface migration.

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“…4,[9][10][11] In the case of diffusional transformations, the existence of the orientation relationships between austenite and product phases such as Widmanstätten ferrite or cementite is also recognised frequently [12][13][14][15][16][17][18] because of atomic-site correspondence at the phase boundaries. In addition, it was demonstrated that even in a diffusional transformation invariant-plane strain (IPS) type surface reliefs of the product phase can often be observed, 19) and the phenomenological theory of martensite can be applied to such transformations. [20][21][22][23][24][25] Thus the morphological and crystallographic similarities between martensitic and bainitic transformations have led to the stimulating discussions on the mechanism of bainite transformations.…”

Section: Introductionmentioning

confidence: 99%

Advances in Physical Metallurgy and Processing of Steels. Microstructural Evolutions with Precipitation of Carbides in Steels.

Ohmori

2001

ISIJ International

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The studies on the crystallographic features of diffusional transformation of austenite in various steels have been reviewed. A primary ferrite forming at an austenite grain boundary is related to at least one of the austenite grains separated by the boundary with the Bain correspondence. In the case of the microstructures containing both ferrite and carbides such as pearlite, degenerate pearlite, interphase precipitation of alloy carbides, and upper and lower bainites, the crystallographic relationships between ferrite and carbides provide further information to elucidate the transformation mechanisms. In the present report, therefore, the orientation relationships between ferrite, carbide and austenite as well as the habit planes of platelike transformation products and the mechanisms of transformations are discussed.

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Thickening kinetics of proeutectoid ferrite plates in Fe-C alloys

Cited by 166 publications

References 26 publications

The proeutectoid cementite transformation in steels

The proeutectoid cementite transformation in steels

The Austenite/Ferrite Front Migration Rate during Heating of IF Steel

Advances in Physical Metallurgy and Processing of Steels. Microstructural Evolutions with Precipitation of Carbides in Steels.

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