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Enhancement of Mechanical Properties of Medium Carbon Steel by Formation of Ultra- fine Bainitic Microstructures
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  • Sherif Ali,
  • Ahmed Shash,
  • Mohamed Kamal ElFawkhry,
  • Ahmed Farahat,
  • Taha Mattar,
  • Iman El-Mahallawi
Sherif Ali
Cairo University Faculty of Engineering
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Ahmed Shash
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Mohamed Kamal ElFawkhry
Central Metallurgical Research and Development Institute
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Ahmed Farahat
Central Metallurgical Research and Development Institute
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Taha Mattar
CMRDI
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Iman El-Mahallawi
Cairo University
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Abstract

In this work, ultra-refined bainitic structures are obtained in medium carbon steel through control of alloy design (Si and Al content) and low temperature isothermal bainitic transformation heat treatment. The chemical design of the steel was modified by using varying Al ratios and the steel was heat treated by isothermal transformation. The tensile strength and ductility were found to improve significantly, and this was owed to modification of the cementite morphology from plate-like to spheroidal morphology. In addition, grain refinement was achieved by fine bainitic structures generated through the heat treatment process. This new technology will have promising results to the steel industry in terms of saving time and energy, enhancing the mechanical properties and reducing the total production cost.