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Influence of TMCP Parameters on Structure and Properties of Low Carbon Cu Bearing Ultra-High Strength Steel

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Abstract

Ultrahigh level of strength, toughness, good weldability, and also weight reduction are the key issues in the automotive and structural industries for improving fuel efficiency and the economy of structure fabrication. The present investigation has produced an ultrahigh strength low carbon Cu bearing steel through the thermo-mechanically controlled processing (TMCP). Here Cu not only acts as a precipitation former but also delays the recrystallisation through a solute drag effect. The steel shows Cu-rich precipitates within the bainite-martensite microstructure. Cu-rich particles within the lower bainite, precipitation strengthening, solid solution strengthening, and delayed recrystallisation significantly improve the yield strength (≈1.25 GPa) and the strain hardening ability. The present steel has shown an excellent combination of mechanical properties comprising of ultra-high ultimate tensile strength >1550 MPa with ductility >12% and satisfactory low-temperature toughness (28 J/cm2). The investigated steel with low carbon content is expected to have good weldability.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, IIEST, 711103, Shibpur, Howrah, India

    G. Mandal, S. K. Ghosh & S. Chatterjee

  2. Department of Metallurgical and Materials Engineering, IIT, 721302, Kharagpur, Kharagpur, India

    D. Chakrabarti

Authors
  1. G. Mandal
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  2. S. K. Ghosh
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  3. D. Chakrabarti
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  4. S. Chatterjee
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Correspondence to S. K. Ghosh.

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Mandal, G., Ghosh, S.K., Chakrabarti, D. et al. Influence of TMCP Parameters on Structure and Properties of Low Carbon Cu Bearing Ultra-High Strength Steel. Phys. Metals Metallogr. 121, 269–275 (2020). https://doi.org/10.1134/S0031918X2002012X

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  • DOI: https://doi.org/10.1134/S0031918X2002012X

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