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<p>A medium manganese steel of nominal composition 0.063C-14.91Mn-4.38Ni-2.05Al-0.82W-2.18Mo-1.77Cu-1.72Si-0.09Nb-0.11V-0.0007B (composition in wt.%) is chosen for the study. The steel produced by induction melting was forged and hot rolled for securing a homogeneous structure. The hot rolled strip of 8&#xa0;mm thickness was used for further study. The steel strips were heat treated in accordance with predesigned schedules, as detailed in experimental section. Characterization of heat-treated steels (quenched and aged) in respect of its structure and mechanical properties was performed with the aid of x-ray diffraction , scanning electron microscope, electron back scatter diffraction and transmission electron microscopy studies for microstructure and fractography; universal testing machine was employed for mechanical property evaluation. It was observed that the microstructure of the steel is mostly composed of twinned austenite with dispersed molybdenum carbides. Occasional presence of martensite could be noticed too. Moreover, it was observed that upon ageing at 600&#xa0;°C for 40&#xa0;h, the ice water quenched steel could achieve attractive combination of strength and toughness, such as 950&#xa0;MPa UTS at 39% percent elongation. The yield tensile ratio of 0.56 unveil the potential of the steel for automotive application presumably for its potent deep drawability.</p>

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Development of High Strength-High Ductility TRIP-TWIP Steel for Automotive and Light Weight Application

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Mukesh Kr Chowrasia,
  • M. K. Banerjee

摘要

A medium manganese steel of nominal composition 0.063C-14.91Mn-4.38Ni-2.05Al-0.82W-2.18Mo-1.77Cu-1.72Si-0.09Nb-0.11V-0.0007B (composition in wt.%) is chosen for the study. The steel produced by induction melting was forged and hot rolled for securing a homogeneous structure. The hot rolled strip of 8 mm thickness was used for further study. The steel strips were heat treated in accordance with predesigned schedules, as detailed in experimental section. Characterization of heat-treated steels (quenched and aged) in respect of its structure and mechanical properties was performed with the aid of x-ray diffraction , scanning electron microscope, electron back scatter diffraction and transmission electron microscopy studies for microstructure and fractography; universal testing machine was employed for mechanical property evaluation. It was observed that the microstructure of the steel is mostly composed of twinned austenite with dispersed molybdenum carbides. Occasional presence of martensite could be noticed too. Moreover, it was observed that upon ageing at 600 °C for 40 h, the ice water quenched steel could achieve attractive combination of strength and toughness, such as 950 MPa UTS at 39% percent elongation. The yield tensile ratio of 0.56 unveil the potential of the steel for automotive application presumably for its potent deep drawability.