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Thermal Mechanisms of Grain Refinement in Steels: A Review
Zahra Nasiri,Sajad Ghaemifar,Meysam Naghizadeh,Hamed Mirzadeh 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
Thermal mechanisms of microstructural refnement in steels were reviewed. These include thermal cycling, martensiteprocess, and static recrystallization (SRX), in which the dominant stage of microstructural refnement is governed by anannealing treatment of a deformed or an undeformed material. Recent progress in grain refnement by thermal cycling forthe body-centered cubic, face-centered cubic, and dual phase (DP) steels was introduced. The application of the cold rollingand subsequent annealing of a martensite starting structure (martensite process) for grain refnement of low-carbon and DPsteels was reviewed. The formation and reversion of strain-induced martensite in metastable austenitic stainless steels andtheir efects on the microstructural evolutions were critically discussed. Moreover, the repetition of the martensite processand its limitations were explained. Important fndings on the SRX of ferrite and austenite for grain refnement as well as therecrystallization kinetics were presented. Finally, the concepts of controlled rolling for grain refnement and the interaction ofaustenite recrystallization and strain-induced precipitation in microalloyed steels during thermomechanical processing werealso reviewed. This short overview presents the opportunities that the conventional and innovative processing routes canofer for grain refnement of steels.
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