Effect of Interpass Time on the Dynamic Transformation of a Plain C–Mn and a Nb Microalloyed Steel
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TLDR
Strip rolling simulations were carried out on a 0.06%C-0.3%Mn- 0.01%Si and a0.11% C-1.0%Al 0.034%Nb steel over the temperature range 1 000°C to 883°C.Abstract:
Strip rolling simulations were carried out on a 0.06%C-0.3%Mn-0.01%Si and a 0.11%C-1.0%Mn0.11%Si-0.03%Al-0.034%Nb steel over the temperature range 1 000°C to 883°C. Pass strains of 0.4 were applied at a strain rate of 1 s with interpass times of 0.5 s, 1 s, 1.5 s, 3 s and 5 s. Two different temperature schedules were employed, namely i) continuous cooling at 6°C/s and ii) isothermal holding. The mean flow stresses (MFS’s) applicable to strip rolling were determined by integration. The flow stress levels and MFS’s decrease when the interpass times are short. When they are long, the flow stress increases with decreasing temperature. These observations indicate that the austenite is transforming dynamically into ferrite and statically into austenite. The nucleation and growth of the ferrite reduce the rolling load and modify the microstructure. The addition of Nb in solid solution delays the occurrence of dynamic transformation (and the retransformation of ferrite back into austenite). The forward nucleation of ferrite occurs displacively while the retransformation back into austenite takes place by a diffusional mechanism.read more
Citations
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Dynamic transformation of deformed austenite at temperatures above the Ae3
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A metastable phase diagram for the dynamic transformation of austenite at temperatures above the Ae3
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Dynamic Transformation Mechanism for Producing Ultrafine Grained Steels
TL;DR: In this article, the authors review the research history of dynamic transformation and highlight the major aspects of continuous interest including the methods and evidences for identifying DT, thermodynamics and kinetics of DT, mechanism for UFF formation and the effects of some key thermomechanical parameters on DT (and UFG formation), together with an outlook for the future research, and new TMCP design for industrial application.
References
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The Effect of Plastic Deformation of Austenite on the Kinetics of Subsequent Ferrite Formation
TL;DR: In this paper, a modeling approach to account for the effect of deformation on the austenite to ferrite transformation is described, where the stored energy resulting from the formation of a dislocation substructure is considered to result in an elevation of the driving force for transformation.
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