Controlled hot forming of heat treatment steel grades in the intercritical (γ–α) region

Chabbi, Lotfi; Lehnert, W.

doi:10.1016/s0924-0136(00)00631-2

Cited by 10 publications

(7 citation statements)

References 6 publications

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“…Deformation in temperature range of austenite + ferrite stability and precipitation of carbonitrides strongly influence the evolution of the microstructure of steels during thermo‐mechanical processing and properties after processing. This problem was investigated experimentally by Davenport et al5 and Chabbi and Lehnert,6 but there is still no comprehensive mathematical description of the behavior of the steel deformed in such conditions during thermo‐mechanical treatment. Simulation of phase transformations using the concept of multiscale model by combining the conventional equations describing the transformation kinetics at the microlevel with the finite element (FE) solution at the macro‐level, has been well developed for carbon–manganese steels (see, for example, Refs 7–9…”

Section: Introductionmentioning

confidence: 99%

Validation of a Model of Plastic Deformation of Niobium Microalloyed Steels in the Two‐Phase Temperature Region

Niżnik

Kuziak

Pietrzyk

2012

steel research int.

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This article describes a thermo-mechanical-microstructural model for deformation of niobium microalloyed steel in the two-phase range of temperatures. Results of physical and numerical modeling are presented. The physical simulation experiments include plastometric and dilatometric tests, as well as industrial rolling trial. Plastometric tests were performed to describe the flow stress for the wide range of temperatures, including ferritic, two-phase, and austenitic states. Two-stage deformation tests were performed to identify the microstructure evolution model. Dilatometric tests were used to identify the model of phase transformation. A model of the kinetics of the precipitation was adapted from the literature. The coefficients in all the models were identified using inverse analysis. Developed models were implemented in the finite element code. In order to improve the accuracy of the flow stress predictions in the two-phase phase temperature range, internal variable dislocation density model was included, as well. The proposed combination of models correctly predicted microstructure changes and mechanical properties in the two-phase range, during the transformations of the thermo-mechanical treatment. Industrial trials were performed for the final validation of the models.

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Section: Introductionmentioning

confidence: 99%

Validation of a Model of Plastic Deformation of Niobium Microalloyed Steels in the Two‐Phase Temperature Region

Niżnik

Kuziak

Pietrzyk

2012

steel research int.

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“…Experimental data and models on the effect of hot rolling in the two phase region compared to hot rolling in the austenitic, respectively in the ferrite state on the stress strain curves, the hardening and softening processes, and the evolution of the grain structure and texture one finds rather seldom. Flow curves at intercritical for steels were studied in [7], [8]. The kinetic of the phase transformation in steels with different carbon content was analyzed by dilatometer investigations in [9] and the hardening and softening behaviour along with results of model simulations at intercritical deformation of high strength steels were investigated in [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Hot Rolling of FeSi Steels – Effects by Hot Rolling in the Two Phase Region

Schneider

Jungnickel

Müller

et al. 2011

MSF

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Finish rolling in the two-phase region may offer new possibilities for improving the properties of the FeSi steels with phase transformation. Therefore a deeper understanding of the effects by hot rolling in the two phase region or mixed rolling: multistep hot rolling in the two phase region and in the ferrite region on the evolution of the microstructure is desirable. In this paper we will present the results of our experimental studies on the effect of hot rolling in the intercritical state on the hardening and softening in the ferrite state. It will be demonstrated that depending on the process conditions at hot rolling the austenite ferrite transformation affects the stress strain behaviour in the ferrite state at multistep hot rolling remarkable.

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“…Intercritical rolling is one of the new, very promising hot rolling strategies for making thin hot rolled steel strip for C-Mn steels, [1][2][3][4][5] as it enables the production of thinner strip without requiring higher rolling forces and mill investments. However, the control of the sheet thickness and the final sheet properties is much more complex than in the standard austenitic rolling strategies.…”

Section: Introductionmentioning

confidence: 99%