TY - JOUR T2 - Journal of Mining and Metallurgy, Section B: Metallurgy TI - Tempering of deformed and as-quenched martensite in structural steel VL - 55 IS - 1 SP - 95 EP - 99 PY - 2019 DO - 10.2298/JMMB180813002N AU - M. Najafi AU - H. Mirzadeh AU - M. Alibeyki AD - School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran AB - Annealing of deformed martensite (high-temperature tempering) in st37 steel was studied. Different reductions in thickness were considered and compared with the behavior of as-quenched martensite during tempering. Tempering of the asquenched martensite was accompanied by the formation of carbide particles, incomplete disappearance of the lath martensite morphology, and continuous decrease in hardness until reaching low values. However, during tempering of the cold rolled martensite, the precipitation of carbides in the lamellar structure, development of distinct equiaxed ultrafine grains through a continuous recrystallization mechanism, and a sudden hardness drop were characterized. The importance of cold rolling reduction and its amount were also discussed. KW - Low carbon steels KW - Quench and tempering KW - Cold rolling KW - Continuous recrystallization KW - Hardness N1 - Correspondence Address: H. Mirzadeh, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran email: hmirzadeh@ut.ac.ir N1 - J. Min. Metall. Sect. B-Metall. 55 (1) B (2019) 95-99. DOI:10.2298/JMMB180813002N PB - Technical Faculty in Bor SN - 14505339 (ISSN) LA - English J2 - J. Min. Metall. Sect. B Metall. M3 - Article ER