Bainite viewed three different ways

Aaronson, H.I.; Reynolds, W. T.; Shiflet, G. J.; Σπανός, Γ.

doi:10.1007/bf02672557

Cited by 167 publications

(65 citation statements)

References 141 publications

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“…It is however well known that the C-curves of bainite and pearlite overlap extensively in plain carbon steels and the kinetic-Bs appears usually in particular steels containing an appreciable proportion of strong carbide formers such as Mo and Cr. Aaronson and his co-workers [1, 2,5] thus claim that the kinetic-Bs appears to be the result of the solute drag-like effect [ll] of the strong carbide formers on the proeutectoid ferrite reaction, and that the appearance of the kinetic-Bs does not mean a different transformation mechanism for the bainite reaction. It has been proposed that the substitutional elements may segregate to the transformation interfaces and then reduce the activity of carbon in austenite resulting in the low growth rate of proeutectoid ferrite [ll].…”

Section: Formation Temperature Of Bainitic Ferrltementioning

confidence: 99%

Some Aspects of Bainite Transformation in Fe-Based Alloys

Tsuzaki

Maki

1995

J. Phys. IV France

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Section: Formation Temperature Of Bainitic Ferrltementioning

confidence: 99%

Some Aspects of Bainite Transformation in Fe-Based Alloys

Tsuzaki

Maki

1995

J. Phys. IV France

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“…In ADI, the isothermal decomposition of austenite during austempering is of the outmost importance from the viewpoint of the exhibited microstructure. From published literature (Ref [18][19][20][21], there is limited information on the initial stages of ferrite plate nucleation and their subsequent growth during austempering. Hence, the actual mechanisms associated with ausferrite reaction have not yet been clearly disclosed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Copper and Nickel on the Transformation Kinetics of Austempered Ductile Iron

Górny

Tyrała

López

2014

J. of Materi Eng and Perform

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The kinetics of reaction occurring during the austempering treatment of ductile iron (DI) containing different additions of Cu and Ni was investigated in this work. DI bars were heat treated in an instrumented dilatometer in order to follow the exhibited transformation kinetics. The dilatometric results indicated that the addition of Cu alone did not have a significant effect on the incubation times for the austempering transformation. Also, the addition of both, Cu and Ni resulted in a significant effect on reducing the transformation rates. It was found that the austempering process is characterized by two clearly distinguished transformation stages. In the initial stage, the addition of Cu, and to a greater extent, additions of both Cu and Ni led to reductions in the transformation rates shifting the maximum transformation rate values toward longer times. The outcome of this work indicates that during the first stage of austempering, nucleation of the ferrite plates occurs via a diffusionless mechanism while their growth is diffusion controlled. Moreover, after the maximum in the transformation rate has been reached, the growth of ferrite plates becomes dominant with the rate-limiting step becoming the diffusion of C into the surrounding austenite. A qualitative model for the austempering transformation is proposed in this work to account for the experimental observations.

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“…The mechanism of bainite transformation and carbon concentration in the residual austenite at the termination of the bainitic reaction in steels remain still controversial and involves two general concepts, that bainitic reaction occurs via a diffusional mechanism [1], and that bainitic reaction occurs in a displacive mechanism as far as the substitutional elements are concerned [2,3,4]. In case of bainitic transformation, reaction ceases before the parent phase has completely transformed what is known as an incomplete reaction phenomenon.…”

Section: Introductionmentioning

confidence: 99%

An investigation of the mechanism of bainite transformation in experimental 0.2c-1v-2mn steel

Ławrynowicz¹

2012

Advances in Materials Sciences

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The paper presents an investigation of the mechanism of bainite transformation in 0.2C-1V-2Mn steel using high speed dilatometry and TEM backed by thermodynamic analysis. Obtained results confirm the incomplete reaction phenomenon with the cessation of the bainite transformation well before paraequilibrium is achieved. These experimental data indicate that bainitic ferrite forms by a displacive transformation mechanism, but soon afterwards, excess of carbon is partitioned into the residual austenite. The results are discussed in terms of the mechanism of bainite transformation.

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Bainite viewed three different ways

Cited by 167 publications

References 141 publications

Some Aspects of Bainite Transformation in Fe-Based Alloys

Some Aspects of Bainite Transformation in Fe-Based Alloys

Effect of Copper and Nickel on the Transformation Kinetics of Austempered Ductile Iron

An investigation of the mechanism of bainite transformation in experimental 0.2c-1v-2mn steel

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