An investigation on the effect of carbon and silicon on flow behavior of steel

Serajzadeh, S.; Taheri, Ali

doi:10.1016/s0261-3069(01)00080-2

Cited by 93 publications

(49 citation statements)

References 6 publications

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“…The effect of dynamic recrystallization (DRX) on steel processing has been extensively studied [1][2][3][4][5][6][7] in order to predict the fractional softening attributable to this mechanism. One approach involves using Avrami kinetics [5][6][7] to describe the net softening with respect to a calculated work hardening curve derived from the initial part of the flow curve.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Austenite Flow Curves under Industrial Rolling Conditions Using a Physical Dynamic Recrystallization Model

Quelennec

Jonas

2012

ISIJ Int.

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Hot compression tests were carried out on three steels: i) a 0.038% Nb-0.11%C microalloyed grade; ii) a Nb-modified TRIP steel; and iii) a Ti-stabilized low carbon steel. The tests were performed at strain rates up to 1 s -1 and over the temperature range 880-1 200°C. The initiation of dynamic recrystallization (DRX) was observed under all testing conditions. Two sets of equations were derived from the experimental curves: i) a work hardening relation pertaining to the grains in which DRX has not yet nucleated; and ii) a separate work hardening expression describing the mean flow stress applicable to the grains in which DRX is taking place. With the aid of the temperature and strain rate dependences determined from the data, and using the law of mixtures, extrapolated flow curves were calculated applicable to strain rates up to 100 s -1 , i.e. to those involved in strip mill rolling. The simulations show that, once DRX has been initiated, the flow stress is controlled by the kinetics of the softening mechanisms.

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Section: Introductionmentioning

confidence: 99%

Simulation of Austenite Flow Curves under Industrial Rolling Conditions Using a Physical Dynamic Recrystallization Model

Quelennec

Jonas

2012

ISIJ Int.

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“…Some authors have defined the amount of DRX softening with respect to the peak stress σp. 5,6) Alternatively, the net softening due to DRX can be defined as the difference between the work hardening curve pertaining to the as-yet unrecrystallized grains and the experimental flow curve.…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Modeling the Flow Curve of Hot Deformed Austenite

et al. 2011

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A new, more physically realistic and practically useful model is presented for the simulation of high temperature austenite flow curves. It is an extension of our earlier empirical model based on the Avrami kinetics of dynamic recrystallization. In the new approach, the normalization parameter is expressed in terms of the fractional recrystallization and not the amount of softening. Compression experiments carried out on a Nb-modified plain carbon steel enable the simulated flow curves and progress of recrystallization predicted by the two models to be compared.

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“…Some studies [185,190,191] have reported a decreasing activation energy with the increase of C content. Mead et al [192] reported that this is due to the high diffusivity of iron atoms caused by the increase of C content.…”

Section: Influence Of C On Dynamic Recrystallisation Behaviourmentioning

confidence: 99%

Thermomechanical Processing of Structural Steels with Dilute Niobium Additions

Cui

Patel²,

Palmiere

2016

HSLA Steels 2015, Microalloying 2015 &Amp; Offshore Engineering Steels 2015

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-i - AbstractIn this thesis, the influence of various dilute Nb additions (0.005-0.02 wt%) on austenite microstructure evolution along thermomechanical processing, in terms of austenite recrystallisation and grain growth, were investigated using steels with three carbon content levels.At the homogenisation temperature of 1250°C, all dilute Nb additions were dissolved in low carbon steels whereas the Nb dissolution limits for 0.4 wt% and 0.6 wt% C steels were 0.012 wt% and 0.08 wt%, respectively. Dilute Nb additions did not show significant influence on homogenised austenite grain size. The dramatic increase in C contents was more influential, which decreased the homogenised austenite grain size.The influence of dilute Nb additions and C contents on dynamic recrystallisation behaviour was studied by rough rolling at high deformation temperature with low strain rate. The dilute Nb additions were found to increase the critical strain of dynamic recrystallisation whereas C contents showed no influence on the dynamic recrystallisation behaviour.The austenite recrystallisation behaviour after finish rolling and after the holding period between finishing passes were studied by means of interrupted plane strain compression (PSC) tests and double hit PSC tests. It was found that with low Nb supersaturation, recrystallisation happened prior to Nb precipitation. Solute Nb in austenite delayed the onset of austenite recrystallisation through solute drag effect.With high Nb supersaturation, Nb precipitation occurred before the onset of recrystallisation which completely retarded austenite recrystallisation.The austenite grain growth during the holding period between finish rolling passes was studied by the evolution of prior-austenite grain size before and after the 20s holding period at the highest finish rolling temperature (1050°C). There was no Nb precipitation found and the difference in austenite grain growth behaviour was Abstract -iiattributed to the solute drag effect from both Nb and C in solution. It was found that Nb in solution suppressed austenite grain growth. However, the effectiveness of solute Nb in suppressing austenite grain growth was affected by the C content. Acknowledgement

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An investigation on the effect of carbon and silicon on flow behavior of steel

Cited by 93 publications

References 6 publications

Simulation of Austenite Flow Curves under Industrial Rolling Conditions Using a Physical Dynamic Recrystallization Model

Simulation of Austenite Flow Curves under Industrial Rolling Conditions Using a Physical Dynamic Recrystallization Model

A New Approach to Modeling the Flow Curve of Hot Deformed Austenite

Thermomechanical Processing of Structural Steels with Dilute Niobium Additions

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