Prediction of Tempcore Rebar Strength Using a Thermomechanical Simulator with a Designed Hollow Specimen. Issue 1 (30th October 2019)

• Record Type: Journal Article
• Authors: Park, Chun Su; Van Tyne, Chester J.; Lee, Seok-Jae; Lee, Taekyung; Kim, Ji Hoon; Moon, Young Hoon
• Is Part Of: Steel research international. Volume 91:Issue 1(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-10-30
• Subjects: cooling rates -- Gleeble -- rebar -- Tempcore -- thermomechanical processes; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201900520
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : In the Tempcore process, reinforcing bars are produced by short and intensive cooling. This rapid quenching converts the surface layer of a steel bar to a hardened structure. The exact simulation of the Tempcore process by a thermomechanical system is difficult to achieve because its cooling capacity is generally not sufficient to follow the Tempcore cooling rate. Therefore, herein, a hollow specimen is designed to increase the cooling rate. A series of thermomechanical tests following predetermined cooling curves provided by the thermal model is performed. The measured hardness of the thermomechanical‐tested specimen is used to predict the tensile strength of a Tempcore rebar based on the rule of mixture. The results show that the prediction of the strength of a Tempcore rebar by tailored cooling with a hollow cylindrical specimen is feasible with a high degree of reliability. Abstract : The simulation of the Tempcore process by a thermomechanical system is difficult to achieve because its cooling capacity is not sufficient. Therefore, a hollow specimen is designed to expedite the cooling rate, and a series of tests following the predetermined cooling curves are performed. The strength predicted from measured hardness well confirms its feasibility with a high degree of reliability.