Revisiting Temperature and Magnetic Effects on the Fe-30 Wt Pct Ni Martensite Transformation Curve

Guimarães, J.R.C.; Rios, Paulo Rangel

doi:10.1007/s11661-018-4943-2

Cited by 4 publications

(12 citation statements)

References 29 publications

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“…In previous work [5][6][7] , ξ was equal to temperature, magnetic field, mechanical deformation, and of course time. In this paper, one uses ξ = t. That is, this paper considers only isothermal kinetics.…”

Section: Theorymentioning

confidence: 99%

“…Notable, such a forked variation also was observed in the Fe-29.6wt%Ni isothermal transformation (lozenges). This behavior may relate to a change in the martensite substructure from lath into twinned plates 6 . This change is concurrent with the development of transformation chains driven by mechanical autocatalysis, which feeds back strain energy 23 .…”

Section: Observe Inmentioning

confidence: 99%

“…The former were calculated by inputting ν = 10 13 s -1 and k B = 8.3 10 -3 kJ/ mol into Eq. (6). Considerations in the original papers 13,14,20 helped to estimate T*.…”

Section: Observe Inmentioning

confidence: 99%

“…Nonetheless, in many transformations, one observes that there is an incubation time. The proposed alternative to Avrami's equation was introduced to describe martensitic transformations [5][6][7] . Subsequent work suggested that the equation could describe bainitic transformations 7 .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An Alternative to Avrami Equation

2019

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This paper proposes an alternative to the Avrami equation capable of describing whole transformation curves with significant fitting-correlations. The model bears physically meaningful parameters which permit considering the initial transformation kinetics independently from the subsequent microstructural evolution. Data of martensite, bainite, recrystallization, and pearlite transformations validate the model. Further to the expeditious description of transformation curves, the model guides the modeling of specific mechanisms.

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Section: Theorymentioning

confidence: 99%

Section: Observe Inmentioning

confidence: 99%

“…The former were calculated by inputting ν = 10 13 s -1 and k B = 8.3 10 -3 kJ/ mol into Eq. (6). Considerations in the original papers 13,14,20 helped to estimate T*.…”

Section: Observe Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Alternative to Avrami Equation

2019

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“…Focusing the transformations in steels, the present authors have proposed an alternative to Avrami's equation [9][10][11]…”

Section: Introductionmentioning

confidence: 99%

Martensite’s Logistic Paradigm

2021

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This work introduces a deterministic approach to the martensite transformation curve. Martensite is a nucleation-controlled transformation that has two characteristics: autocatalysis and auto-accommodation. Only a small number of martensite units initially form owing to primary nucleation. These new units may cause the transformation of other units by autocatalysis. We call this kind of transformation chained autocatalysis. Moreover, as the transformation progresses, the auto-accommodation influences the arrangement of new units. This work assumes that the transformation-saturation relates to the exhaustion of the chained autocatalysis, which underlines the microstructure. To compare, we considered the KJMA's extended-transformation concept that implies assuming exhaustion by impingement. Data from isothermal martensite transformations and anisothermal martensite transformations are used to validate the model. Those data comprised different grain sizes and carbon contents. The model is based upon Verhulst's logistic concept. We propose that the model's high fitting-capability stems from its deterministic aspect combined with martensite's self-similarity. Additionally, we suggest that chained autocatalysis controls the rate of martensite transformation. Therefore, the relaxation of transformation strains by plasticity assisted by mutual accommodation determines the transformation's martensite volume in the absence of post-propagation coarsening/coalescence.

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General description of martensite transformation curves – a case for bainite

Guimarães

Rios

2019

Materials Science and Technology

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This work describes the results of validation trials of a formal model for the martensite transformation curve in steels. The model is based on microstructural evolution and accepted aspects of athermal, isothermal, mechanical-induced as well as magnetic-assisted martensite transformation modes. The model is operational for martensite and applicable to other intragrain transformations. The paper also explores the extension of the formalism to bainite.

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Revisiting Temperature and Magnetic Effects on the Fe-30 Wt Pct Ni Martensite Transformation Curve

Cited by 4 publications

References 29 publications

An Alternative to Avrami Equation

An Alternative to Avrami Equation

Martensite’s Logistic Paradigm

General description of martensite transformation curves – a case for bainite

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