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Critical Strain for Dynamic Recrystallisation. The Particular Case of Steels

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Department of Materials Science and Engineering, Universitat Politècnica de Catalunya—BarcelonaTech (UPC), c/Eduard Maristany 10-4, Edificio I, 08019 Barcelona, Spain
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Institute of Metallurgy and Materials, Universidad Michoacana de San Nicolás de Hidalgo, Edificio U, Av. Francisco Múgica s/n, CU, 58230 Morelia, Michoacán, Mexico
*
Author to whom correspondence should be addressed.
Metals 2020, 10(1), 135; https://doi.org/10.3390/met10010135
Received: 24 November 2019 / Revised: 27 December 2019 / Accepted: 2 January 2020 / Published: 16 January 2020
The knowledge of the flow behavior of metallic alloys subjected to hot forming operations has particular interest for metallurgists in the practice of industrial forming processes involving high temperatures (e.g., rolling, forging, and/or extrusion operations). Dynamic recrystallisation (DRX) occurs during high temperature forming over a wide range of metals and alloys, and it is known to be a powerful tool that can be used to control the microstructure and mechanical properties. Therefore, it is important to know, particularly in low stacking fault energy materials, the precise time at which DRX is available to act. Under a constant strain rate condition, and for a given temperature, such a time is defined as a critical strain (εc). Unfortunately, this critical value is not always directly measurable on the flow curve; as a result, different methods have been developed to derive it. Focused on carbon and microalloyed steels subjected to laboratory-scale testing, in the present work, the state of art on the critical strain for the initiation of DRX is reviewed and summarized. A review of the different methods and expressions for assessing the critical strain is also included. The collected data are well suited to feeding constitutive models and computational codes. View Full-Text
Keywords: critical strain; onset dynamic recrystallisation; dynamic restoration; softening; hot rolling; strain hardening rate; steels critical strain; onset dynamic recrystallisation; dynamic restoration; softening; hot rolling; strain hardening rate; steels
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Varela-Castro, G.; Cabrera, J.-M.; Prado, J.-M. Critical Strain for Dynamic Recrystallisation. The Particular Case of Steels. Metals 2020, 10, 135.

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