Development of Direct Hot-Rolled Ultralow-Carbon Pre-peritectic Ferrite-Bainite Dual-Phase Steel for a Compact Slab Production Plant
Autor: | Mohamed A. Taha, Taher El-Bitar, G. M. Megahed, Hany Khalifa |
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Rok vydání: | 2021 |
Předmět: |
010302 applied physics
Materials science Dual-phase steel Bainite Mechanical Engineering 02 engineering and technology Strain hardening exponent 021001 nanoscience & nanotechnology 01 natural sciences Mechanics of Materials Ferrite (iron) Martensite 0103 physical sciences Ultimate tensile strength Thermomechanical processing General Materials Science Composite material 0210 nano-technology Ductility |
Zdroj: | Journal of Materials Engineering and Performance. 30:5773-5786 |
ISSN: | 1544-1024 1059-9495 |
DOI: | 10.1007/s11665-021-05789-y |
Popis: | The current work developed a direct hot-rolled ultralow-carbon ferritic-bainitic dual-phase “FBDP” steel with high ductility values in accordance with a compact slab production CSP plant. Four ultralow-carbon alloys with chemical compositions of 0.045% C, 0.28 Si%, 0.91% Mn and different Cr weight contents of 0.59, 1, 1.56 and 2% were determined within the pre-peritectic region from phase diagrams plotted by Thermo-Calc 2020. These alloys were melted and cast into blocks, and then, a certain thermomechanical schedule was applied using the actual data obtained from the log files of a CSP plant. The cooling schedule was designed with the aid of CCT and TTT curves plotted by JMat Pro. The results show that hot-rolled FBDP steel contains a substantial amount of bainite from 10 to 28% and negligible martensite. The increase in Cr led to an increase in the bainite volume fraction and an increase in the yield strength and tensile strength, while the elongation decreased slightly. The strain hardening exponent (n-value) reached values ranging from 0.28 to 0.36, while a value of 0.18 was found in the literature for martensitic DP steel. Stroke-force curves plotted from the Erichsen test achieved high Erichsen index values from 14 to 18 mm. |
Databáze: | OpenAIRE |
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