General description of martensite transformation curves – a case for bainite

Guimarães, J.R.C.; Rios, Paulo Rangel

doi:10.1080/02670836.2019.1591027

Cited by 3 publications

(6 citation statements)

References 44 publications

(91 reference statements)

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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%

“…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%

“…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 . This work demonstrate the latter, as well as show that recrystallization and pearlite transformation also can be properly described and analyzed.…”

Section: Introductionmentioning

confidence: 99%

See 2 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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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%

“…In the equation above, x is an "advance" variable, which in previous works [9][10][11] was equal to temperature, magnetic field, mechanical deformation, and time. The x i is the first datum in a dataset.…”

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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Effect of tempering temperature on microstructure and properties of aluminium‐bearing high boron high speed steel

Zhang

et al. 2020

Materialwissenschaft Werkst

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Heat treatment is of great significance to the performance improvement of high speed steel. Via heat treatment, the microstructure of high speed steel can be improved, thus greatly improving the material performance. The effect of tempering temperature on the microstructure of aluminium‐bearing high boron high speed steel (AB‐HSS) was investigated by optical microscope (OM), scanning electron microscope (SEM) and x‐ray diffraction (XRD). The hardness and wear resistance of the alloy at different tempering temperatures were tested by Rockwell hardness tester, micro‐hardness tester and wear tester. The experimental results indicate that the tempering microstructure of aluminium‐bearing high boron high speed steel consists of α‐Fe, M2B and a few of M23(C, B)6. Tempering temperature could greatly affect the wear resistance of materials. With the increase of tempering temperature, the wear resistance of aluminium‐bearing high boron high speed steel firstly increase and then decrease. The alloy tempered at 450 °C has the best wear resistance and minimum wear weight loss. This study provides a reference for the formulation of heat treatment process of aluminium‐bearing high boron high speed steel.

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General description of martensite transformation curves – a case for bainite

Cited by 3 publications

References 44 publications

An Alternative to Avrami Equation

An Alternative to Avrami Equation

Martensite’s Logistic Paradigm

Effect of tempering temperature on microstructure and properties of aluminium‐bearing high boron high speed steel

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