Processing Strategies for Hot-Rolled Medium-Mn Steels

Abstract:

The study aims at reviewing manufacturing schedules for hot-rolled and intercritically-annealed and thermomechanically processed medium-Mn sheet steels. Major differences between these two types of processing are indicated. They include initial microstructure (low-C martensite for hot-rolled products and deformed austenite for thermomechanically processed products), partitioning of alloying elements (depending on intercritical annealing or batch annealing conditions) and microstructure prior to cooling (ultrafine-grained lath mixture of ferrite and austenite for hot-rolled, intercritically annealed products and deformed austenite for directly cooled products). The comparison of typical microstructures (LM, SEM) and phase transformation behavior are presented. A role of Mn as an austenite stabilizer in a range used for medium-Mn steels is explained. Some results are provided for economic steels containing 3% and 5% Mn.

• Periodical: Materials Science Forum (Volume 1016)
• Pages: 132-136
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1016.132
• Online since: January 2021
• Authors: Adam Grajcar*, Skowronek Adam, Mateusz Morawiec
• Keywords: Coiling, Hot-Rolled Sheet, Intercritical Annealing, Medium-Mn Steel, Thermomechanical Processing

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