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<p>Thermomechanical controlled processing (TMCP) serves as a key factor in determining the mechanical characteristics of high-strength low-alloy (HSLA) steels. This research investigates how key processing conditions—including the rolling draft schedule, finish rolling temperature, exit temperature of accelerated cooling (ACC), and rate of cooling—affect the microstructural development and mechanical properties of Nb-Mo-V-Ti containing steel. To evaluate these effects, tensile and Charpy impact tests are conducted, supported by optical and scanning electron microscopy, along with electron backscatter diffraction (EBSD) analyses. The results indicate that changes in finishing rolling temperature, accelerated cooling exit temperature, and cooling rate produce distinct microstructural features, which in turn result in significant variations in strength, toughness, and overall mechanical performance of the steel. The TMCP schedule involving controlled rolling within the α + γ dual-phase region, coupled with a reduced finishing temperature, lower ACC exit temperature, and higher cooling rate, promotes pronounced microstructural refinement. This processing route facilitates the formation of finer polygonal and quasi-polygonal ferrite, acicular ferrite, and bainitic constituents, along with a dense subgrain structure and finely dispersed precipitates. The increased fraction of low-angle grain boundaries and elevated dislocation density collectively contribute to enhanced yield strength, tensile strength, and impact toughness, demonstrating the strong dependence of mechanical performance on the evolved microstructures. Furthermore, under identical TMCP conditions, the lower carbon steel exhibits improved tensile strength–ductility balance, superior impact toughness, and enhanced weldability. Although the individual contributions of specific TMCP parameters are not independently isolated in the present investigation, the study provides a systematic evaluation of how combined thermomechanical processing variables and alloy design interact to control microstructural evolution and ultimately dictate the structure–mechanical property relationships in controlled rolled Nb-Mo-V-Ti high-strength low-alloy (HSLA) steels.</p>

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Structure–Mechanical Property Relationships in Controlled Rolled Nb-Mo-V-Ti Containing HSLA Steel: The Effect of TMCP Parameters

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Md Serfraj Alam,
  • Ratnesh Gupta,
  • Ghanshyam Das,
  • Bimal Kumar Jha

摘要

Thermomechanical controlled processing (TMCP) serves as a key factor in determining the mechanical characteristics of high-strength low-alloy (HSLA) steels. This research investigates how key processing conditions—including the rolling draft schedule, finish rolling temperature, exit temperature of accelerated cooling (ACC), and rate of cooling—affect the microstructural development and mechanical properties of Nb-Mo-V-Ti containing steel. To evaluate these effects, tensile and Charpy impact tests are conducted, supported by optical and scanning electron microscopy, along with electron backscatter diffraction (EBSD) analyses. The results indicate that changes in finishing rolling temperature, accelerated cooling exit temperature, and cooling rate produce distinct microstructural features, which in turn result in significant variations in strength, toughness, and overall mechanical performance of the steel. The TMCP schedule involving controlled rolling within the α + γ dual-phase region, coupled with a reduced finishing temperature, lower ACC exit temperature, and higher cooling rate, promotes pronounced microstructural refinement. This processing route facilitates the formation of finer polygonal and quasi-polygonal ferrite, acicular ferrite, and bainitic constituents, along with a dense subgrain structure and finely dispersed precipitates. The increased fraction of low-angle grain boundaries and elevated dislocation density collectively contribute to enhanced yield strength, tensile strength, and impact toughness, demonstrating the strong dependence of mechanical performance on the evolved microstructures. Furthermore, under identical TMCP conditions, the lower carbon steel exhibits improved tensile strength–ductility balance, superior impact toughness, and enhanced weldability. Although the individual contributions of specific TMCP parameters are not independently isolated in the present investigation, the study provides a systematic evaluation of how combined thermomechanical processing variables and alloy design interact to control microstructural evolution and ultimately dictate the structure–mechanical property relationships in controlled rolled Nb-Mo-V-Ti high-strength low-alloy (HSLA) steels.