Recrystallization kinetics and microstructure evolution during annealing of a cold-rolled Fe–Mn–C alloy

Lu, Youcai; Molodov, Dmitri A.; Gottstein, Günter

doi:10.1016/j.actamat.2011.01.063

Cited by 138 publications

(44 citation statements)

References 33 publications

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“…In order to model the nucleation process, the energy threshold and site preferences should be defined. Lü et al . studied the nucleation site preferences during static recrystallization for a similar composition after cold rolling and found out that recrystallized nuclei occur only on interfaces.…”

Section: Simulation and Resultsmentioning

confidence: 99%

Coupling of Crystal Plasticity Finite Element and Phase Field Methods for the Prediction of SRX Kinetics after Hot Working

Güvenç

Bambach�

2014

steel research int.

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The conventional approach to model static recrystallization (SRX) kinetics is to use the wellknown Kolmogorov-Johnson-Mehl-Avrami (KJMA) equation. However, the validity of KJMA kinetics depends on whether the real recrystallization process follows the assumptions made in the derivation of the KJMA kinetics, which are a random distribution of nucleation sites, isotropic growth and a constant growth velocity. When these assumptions are violated the KJMA kinetics loose their physical meaning and turn into an empirical formula with limited predictive capability. In such cases, phase field (PF) method can be an alternative to the KJMA model, since it is based on irreversible thermodynamics. An effective strategy to apply the PF method to static recrystallization problems is coupling it to a deformation model though which the prior deformation process is simulated. For that purpose crystal plasticity finite element method (CPFEM) can be employed. In this work, an example of a weak coupling strategy was applied to a steel grade of commercial interest (X60Mn23 TWIP steel) for which KJMA equation is invalid. Deformation of a Voronoi type representative volume element was modeled using a Crystal plasticity finite element formulation after determining the material parameters of a strain hardening model from macroscopic experiments. Afterwards, the deformed structure was transferred on to a finite difference grid with a dedicated mapping scheme, which was then used as input for phase field simulation. Finally, the simulation results were compared with the results of stress relaxation tests. It was found that although the grain morphology of the simulation differed from the experimental results, the coupled simulation strategy was able to mimic the main features of the static recrystallization (SRX) kinetics.

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Section: Simulation and Resultsmentioning

confidence: 99%

Coupling of Crystal Plasticity Finite Element and Phase Field Methods for the Prediction of SRX Kinetics after Hot Working

Güvenç

Bambach�

2014

steel research int.

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“…The thickness reductions are given in parentheses. duction of 50% annealing at 560C for 3 h resulted in a recrystallized volume fraction of about 80% [20]. The S parameter has the minimum value at temperatures 600C for sample A and 650C for sample B.…”

Section: Methodsmentioning

confidence: 99%

Positron annihilation studies of high-manganese steel deformed by rolling

2015

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Abstract. Positron annihilation spectroscopy (PAS) has been used to study the annealing behavior of cold rolled Fe -21 wt% Mn steel with 0.05 wt% C. After the initial annealing of defects shown by Doppler broadening of the annihilation line, a slight increase in the annihilation line shape parameter, i.e., the so-called S parameter and then its decrease in the temperature range between 225C and 450C indicates generation of new defects and their subsequent annealing. This temperature range coincides with X-ray diffraction measurements, which indicate reversion of deformation-induced -martensite. However, for annealing in this temperature range with slow cooling of the sample, the formation of ferrite already starts. The results are compared with our previous results for deformed austenitic stainless steel 1.4301 (EN) where only reversion of deformation-induced -martensite was detected.

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“…Grain growth is rapid because of the grain boundaries migration, and according to the Arrhenius relation, it is the thermally activated process. [17].…”

Section: Microstructure and Crystallographic Texturementioning

confidence: 99%

The Influence of Thermomechanical Processing Conditions on the Evolution of Microstructure and Crystallographic Textures and the Mechanical Properties of Deformed Mild Steels in the Intercritical Region

Sar

Barella

Gruttadauria

et al. 2018

Advances in Materials Science and Engineering

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Rolling temperature and rolling reduction intensively influence the formation of Luder lines and fluting marks in mild steels. They govern these effects through control of strain aging. In order to enhance the strain aging resistance and the consequent reduction of yield point elongation and fluting intensity, warm rolling without using the skin pass process is applied. The development of microstructure and crystallographic textures during deformation process and the determination of fluting intensity and mechanical properties consisting of tensile and formability properties in terms of different thermomechanical conditions (RT and RR%) were investigated in this study. These properties are determined through the use of bending, tensile tests, optical microscope, and EBSD analysis.

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Recrystallization kinetics and microstructure evolution during annealing of a cold-rolled Fe–Mn–C alloy

Cited by 138 publications

References 33 publications

Coupling of Crystal Plasticity Finite Element and Phase Field Methods for the Prediction of SRX Kinetics after Hot Working

Coupling of Crystal Plasticity Finite Element and Phase Field Methods for the Prediction of SRX Kinetics after Hot Working

Positron annihilation studies of high-manganese steel deformed by rolling

The Influence of Thermomechanical Processing Conditions on the Evolution of Microstructure and Crystallographic Textures and the Mechanical Properties of Deformed Mild Steels in the Intercritical Region

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