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Mohammad Reza Akbarpour,Amirhossein Mashhuriazar,Mohammad Daryani 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
One of the most efficient and cheapest ways to improve steel reinforcement bars is the Tempcore process. In this study, theeffects of water pressure, water temperature, bar diameter, and its initial temperature, as Tempcore process parameters onmicrostructural and mechanical properties of reinforcing rebars were numerical and experimental investigated by using theTaguchi experimental design method. Results showed that these Tempcore process parameters influence the cooling intensity,which causes the formation of martensite at the surface layer and fine-grained ferrite–pearlite at the core and improvementof tensile strength. All of the considered parameters strongly affect the volume fraction of ferrite and pearlite in the rebarcenter and thickness of the martensite layer, but among them, water pressure with a 59% impact has a more substantial effect. Ultimately, to figure out the mechanical characteristics of hot rolled and optimal sample’ rebar, tensile tests were conducted. Outcomes displayed that the Tempcore process increases the yield and ultimate tensile strengths as much as 1.5 and 1.3times, respectively, but slightly decreases the elongation.