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Woonam Choi,Sungwook Choi,Sehwook Bae,Namhyun Kang 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
The reinforcing bar (rebar) produced by Tempcore process had tempered martensite structure on its surface, owing to quenchingand tempering, and ferrite–pearlite structure at the core owing to slow cooling rate. Bainite, a low-temperature transformationphase, was observed in the transition area. Mechanical properties of the rebar are significantly influenced by arearatio and hardness of the tempered martensite. In this study, microstructure and area ratio of the tempered martensite of therebar produced by the Tempcore process were predicted using finite volume method and a continuous cooling transformationdiagram. The area ratio of the tempered martensite was predicted with error range of ± 6%. Furthermore, association betweenthe microstructure and hardness was determined by a non-isothermal tempering experiment. The hardness of the temperedmartensite was successfully predicted using the tempering temperature with R-squared 98%. The proposed methodologycan be effectively used to control the mechanical properties of the rebars.