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<p>This study investigates the effects of quenching and partitioning (Q&amp;P) on the microstructure and mechanical properties of hot rolled (HR) microalloyed steel (0.065C-1.37Mn-0.201Si-0.244Cr-0.02Ni-0.01Mo). The steel underwent thermomechanical processing, controlled cooling, and Q&amp;P treatment, resulting in a complex microstructure that combines high strength and ductility. The microalloyed steel was processed to develop smaller lath martensite, bainite, and fine pearlite structures, with inter-lath austenite sandwiched between fine martensite laths. The presence of up to 2.0% manganese effectively delayed the austenite-ferrite transformation during fast cooling, significantly improving the mechanical properties. The study found that quenching at 180 ± 5&#xa0;°C and partitioning at 400 ± 5&#xa0;°C produced higher levels of retained austenite, enhancing strength and elongation through transformation-induced plasticity. Specifically, the 30% and 50% deformed samples exhibited significant increases in martensite production, leading to improved mechanical parameters, including a maximum yield strength of 1205.01&#xa0;MPa and elongation of 18.11%. The Q&amp;P-treated steel demonstrated high tensile strengths of 1155 ± 4&#xa0;MPa and 1415 ± 3&#xa0;MPa for the 30% HR and 30% HR-Q&amp;P samples, respectively. Air jet erosion tests revealed that as-received microalloyed steel showed the highest weight loss, while 30% HR and 50% HR specimens, particularly the 30% HR with martensite lath blocks, exhibited superior erosion resistance due to higher hardness. At a 90° impact angle, erosion was dominated by ductile behavior with consistent plastic deformation and work hardening across all specimens. The as-built microstructure, including lath or plate martensite, bainite, and retained austenite, enhanced hardness, strength, ductility, and wear resistance. These findings underscore the critical role of microstructure development and thermomechanical processing in optimizing the mechanical performance of microalloyed steels for various applications.</p>

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Effects of Quenching and Partitioning Treatment on Microstructure and Mechanical Properties of Hot Rolled Microalloyed Steel

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Anup Kumar Maurya,
  • Arun Kumar,
  • Chandan Pandey,
  • Rahul Chhibber,
  • Vishnu K. Sharma

摘要

This study investigates the effects of quenching and partitioning (Q&P) on the microstructure and mechanical properties of hot rolled (HR) microalloyed steel (0.065C-1.37Mn-0.201Si-0.244Cr-0.02Ni-0.01Mo). The steel underwent thermomechanical processing, controlled cooling, and Q&P treatment, resulting in a complex microstructure that combines high strength and ductility. The microalloyed steel was processed to develop smaller lath martensite, bainite, and fine pearlite structures, with inter-lath austenite sandwiched between fine martensite laths. The presence of up to 2.0% manganese effectively delayed the austenite-ferrite transformation during fast cooling, significantly improving the mechanical properties. The study found that quenching at 180 ± 5 °C and partitioning at 400 ± 5 °C produced higher levels of retained austenite, enhancing strength and elongation through transformation-induced plasticity. Specifically, the 30% and 50% deformed samples exhibited significant increases in martensite production, leading to improved mechanical parameters, including a maximum yield strength of 1205.01 MPa and elongation of 18.11%. The Q&P-treated steel demonstrated high tensile strengths of 1155 ± 4 MPa and 1415 ± 3 MPa for the 30% HR and 30% HR-Q&P samples, respectively. Air jet erosion tests revealed that as-received microalloyed steel showed the highest weight loss, while 30% HR and 50% HR specimens, particularly the 30% HR with martensite lath blocks, exhibited superior erosion resistance due to higher hardness. At a 90° impact angle, erosion was dominated by ductile behavior with consistent plastic deformation and work hardening across all specimens. The as-built microstructure, including lath or plate martensite, bainite, and retained austenite, enhanced hardness, strength, ductility, and wear resistance. These findings underscore the critical role of microstructure development and thermomechanical processing in optimizing the mechanical performance of microalloyed steels for various applications.