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<p>The microstructure and mechanical properties of low-alloy low-carbon hot-rolled steel after various heat treatment modes are studied. After the austenitization in the intercritical range followed by salt bath holding between <i>B</i><sub><i>s</i></sub> and <i>M</i><sub><i>s</i></sub> temperatures, the tensile strength of 850 – 1150 MPa and elongation of 17 – 22% are achieved in the steel due to the TRIP effect. After intercritical annealing followed by quenching and holding below <i>M</i><sub>s</sub>, the tensile strength of the steel varies from 830 to 1150 MPa with elongation in the range of 20 – 24% as in dual-phase high-ductility steels. After quenching from a fully austenitized condition to below the temperature <i>M</i><sub>s</sub> and a long hold to achieve single stage quenching and partitioning treatment, the tensile strength of the steel is 980 – 1280 MPa, and the elongation is about 12%. The lowest tensile strength of 920 – 1020 MPa with 11 – 16% elongation is obtained after total austenitizing followed by bainitic holding. After some heat treatment modes, the product of the tensile strength by the ductility exceeds 20 GPa · %, which corresponds to the bottom level of the third-generation advanced high-strength steels (AHSS).</p>

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Response of Low-Alloy Low-Carbon Steel to Trip Aided Bainitic, Dual-Phase High-Ductility, Single-Stage Quench Partitioning and Bainitic Ferrite Heat Treatment Conditions

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • J. N. Mohapatra,
  • D. Satish Kumar,
  • G. Balachandran

摘要

The microstructure and mechanical properties of low-alloy low-carbon hot-rolled steel after various heat treatment modes are studied. After the austenitization in the intercritical range followed by salt bath holding between Bs and Ms temperatures, the tensile strength of 850 – 1150 MPa and elongation of 17 – 22% are achieved in the steel due to the TRIP effect. After intercritical annealing followed by quenching and holding below Ms, the tensile strength of the steel varies from 830 to 1150 MPa with elongation in the range of 20 – 24% as in dual-phase high-ductility steels. After quenching from a fully austenitized condition to below the temperature Ms and a long hold to achieve single stage quenching and partitioning treatment, the tensile strength of the steel is 980 – 1280 MPa, and the elongation is about 12%. The lowest tensile strength of 920 – 1020 MPa with 11 – 16% elongation is obtained after total austenitizing followed by bainitic holding. After some heat treatment modes, the product of the tensile strength by the ductility exceeds 20 GPa · %, which corresponds to the bottom level of the third-generation advanced high-strength steels (AHSS).