TY - JOUR T2 - Journal of Mining and Metallurgy, Section B: Metallurgy TI - Spheroidization heat treatment and intercritical annealing of low carbon steel VL - 55 IS - 3 SP - 405 EP - 411 PY - 2019 DO - 10.2298/JMMB180813033N AU - Z. Nasiri AU - H. Mirzadeh AD - School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran AB - Spheroidization annealing of low carbon steel and its effects on the microstructure and mechanical properties of dual phase (DP) steel were studied. It was revealed that the reduction in strength and hardness of the quenched martensitic microstructure was much more pronounced compared to the fully annealed ferritic-pearlitic banded microstructure with spheroidizing time. This was related to the confinement of spheroidized carbide particles to distinct bands in the latter, and the uniform dispersion of carbides and high-temperature tempering of martensite in the former. During intercritical annealing of the spheroidized microstructures, the tendency to obtain martensite particles as discrete islands was observed. This, in turn, resulted in an inferior strength-ductility balance compared to the DP steel obtained from the intercritical annealing of martensite, which negated the usefulness of the spheroidized microstructures as the initial microstructures for the processing of DP steels. KW - DP steels KW - Spheroidizing treatment KW - Microstructure KW - Mechanical properties KW - Strain hardening rate 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 (3) B (2019) 405-411. DOI:10.2298/JMMB180813033N PB - Technical Faculty in Bor SN - 14505339 (ISSN) LA - English J2 - J. Min. Metall. Sect. B Metall. M3 - Article ER