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- 저자 : Mohamed A.‑H. Gepreel (검색결과 1 건)
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Simulation of Tempcore Process for 500 MPa Steel Bars
Sally Hosny,Mohamed A.‑H. Gepreel,Mona G. Ibrahim,Ahmed R. Bassuony 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
Tempcore process is an environmental friendly, simple and energy efficient technology for producing high strength reinforcingsteel rebars without requiring costly alloying addition. The mechanical properties of Tempcore treated steel rebarhave been previously investigated using various models, although they are still restricted to specific steel compositions,bar sizes, and/or process parameters. In this study, a methodology is developed to predict the internal microstructure andoverall mechanical properties (i.e., hardness, ultimate tensile strength, and yield strength) of Tempcore treated bars for anysteel compositions, bar sizes, process parameters, and simulation assumptions. Three sequential models are proposed: (1)thermal model to predict thermal profiles of bars using computational fluid dynamics CFD simulation, (2) metallurgicalmodel to estimate the internal microstructure change across the bar section using both; the JMatPro® and a derived equationthat calculates the martensite volume fraction (Vm%) of a functionally graded steel bar, and (3) Regression models basedon the rule of mixture to predict mechanical properties. The validation results show a good agreement between calculatedand experimental results; the mean absolute percentage errors are 2.8% for hardness, 2.8% for ultimate stress and 3.8% foryield stress. Eventually, the proposed methodology presented a sustainable, easy, fast, and cost-efficient solution to attainthe required mechanical properties of a steel bar treated by Tempcore process.
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