Influence of Strain Path on Microstructure Evolution of Low Carbon Steels

Muszka, Krzysztof; Sun, Lin Zhu; Wynne, B.P.; Palmiere, E.J.; Rainforth, W. M.

doi:10.4028/www.scientific.net/msf.638-642.3418

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…For microalloyed steels, it has been reported the strain reversal retards the recrystallisation and Nb(C,N) precipitation kinetics [4]. However, early research by authors found that the strain path change has very mild effect on the microstructure evolution through phase transformation [5]. In this work, the focus will be placed on the direct strain path effect during deformation below the austenite recrystallisation-stop temperature in terms of its influence on the phase transformation behaviour.…”

Section: Introductionmentioning

confidence: 98%

The Effect of Strain Path Reversal during Austenite Deformation on Phase Transformation in a Microalloyed Steel Subjected to Accelerated Cooling

Sun

Muszka

Wynne

et al. 2012

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In the present study, monotonic and cyclical torsional deformations of an X-70 microalloyed steel were conducted at austenite temperatures below the recrystallisation-stop temperature (T5%). The austenite deformation is followed by accelerated continuous cooling to allow the investigation of the strain reversal effect on the subsequent phase transformation mechanisms. The transformation behaviours were studied by a dilatometry method, and the microstructures of the transformed products have been analysed using electron back scatter diffraction (EBSD). The results of this study shows that although subjected to the same total cumulative strain and the same cooling rate, strain path reversal by cyclical torsion produces lower temperature transformation products involving mainly a displacive mechanism, comparing to simple strain path deformation which leads to higher temperature transformation by a reconstructive mechanism.

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Section: Introductionmentioning

confidence: 98%

The Effect of Strain Path Reversal during Austenite Deformation on Phase Transformation in a Microalloyed Steel Subjected to Accelerated Cooling

Sun

Muszka

Wynne

et al. 2012

MSF

Self Cite

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show abstract

On the Effect of Strain Reversal on Static Recrystallisation and Strain-Induced Precipitation Process Kinetics in Microalloyed Steels

Muszka

Sun

Wynne

et al. 2012

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Recent observations show that the strain reversal affects significantly and in a complex way both the static recrystallisation (SRX) and strain-induced precipitation (PPT) kinetics in Nb-microalloyed steel. It is already known that the recrystallisation stagnation is a consequence of the competition between the driving pressure for recrystallisation and the pinning pressure caused by the strain-induced precipitation of Nb (C,N) precipitates. Both of these parameters depend in turn on the local dislocation density. Thus, it is expected that a variation of the local dislocation density due to reversal of the strain will affect at the same time the local driving and the pinning pressures, which will cause the difference in the hardening levels. In the present paper, the influence of strain path change on microstructure evolution and mechanical behaviour in Nb-microalloyed steel (API X-70 grade) was studied. The deformation schedules were designed in order to investigate an effect of strain reversal on both static recrystallisation and strain-induced precipitation process kinetics. Flow curves recorded during deformation of X-70 steel showed clear influence of applied strain path on both static recrystallisation kinetics and strain-induced precipitation process.

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Influence of Strain Path on Microstructure Evolution of Low Carbon Steels

Cited by 2 publications

References 7 publications

The Effect of Strain Path Reversal during Austenite Deformation on Phase Transformation in a Microalloyed Steel Subjected to Accelerated Cooling

The Effect of Strain Path Reversal during Austenite Deformation on Phase Transformation in a Microalloyed Steel Subjected to Accelerated Cooling

On the Effect of Strain Reversal on Static Recrystallisation and Strain-Induced Precipitation Process Kinetics in Microalloyed Steels

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