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Recrystallization and Second-Phase Precipitation in Nb-V Microalloyed Steels: A Thermal Simulation Study
Qilin Ma1,2, Shubiao Yin3, Chengjia Shang2
1Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China.
Materials (Basel, Switzerland)
|July 12, 2025
Summary
This study reveals that niobium-vanadium (Nb-V) microalloyed steel shows superior grain refinement during rough rolling compared to niobium (Nb) steel. The enhanced precipitation of fine (Nb, V)C particles in Nb-V steel significantly refines austenite grain size.
Area of Science:
- Materials Science
- Metallurgy
- Physical Chemistry
Background:
- Understanding austenite recrystallization and second-phase precipitation is crucial for high-performance microalloyed steels.
- Niobium (Nb) and niobium-vanadium (Nb-V) microalloying are key strategies for grain refinement and precipitation strengthening.
- The interplay between deformation, temperature, and microalloying elements influences steel microstructure evolution.
Purpose of the Study:
- To investigate the relationship between recrystallization behavior and second-phase precipitation in Nb-V microalloyed steel.
- To analyze the effects of deformation amount and temperature on austenite recrystallization.
- To assess the influence of Nb-V microalloying on second-phase precipitation characteristics and kinetics.
Main Methods:
- Thermal simulation experiments were conducted to study steel behavior during rough rolling.
- Thermodynamic and kinetic calculations were employed to analyze microalloying effects on precipitation.
- Microstructural analysis focused on austenite recrystallization, grain refinement, and second-phase precipitate characteristics.
Main Results:
- Both deformation amount and temperature significantly impact austenite recrystallization.
- Nb-V microalloyed steel exhibited more pronounced grain refinement than Nb steel.
- Nb-V steel primarily precipitated (Nb, V)C with smaller, uniformly dispersed particles (10.60 nm) compared to Nb steel's NbC (33.85 nm).
Conclusions:
- Nb-V microalloying accelerates second-phase precipitation kinetics and refines austenite grain size more effectively than Nb alone.
- Fine second-phase particles in Nb-V steel significantly hinder grain boundary motion, surpassing the effect of solid-solution atoms.
- These findings provide insights into designing high-performance microalloyed steels through controlled precipitation and grain refinement.
Keywords:
Nb-V microalloyingprecipitation kineticsrecrystallization behaviorsecond-phase precipitationthermodynamic and kinetic calculationsMore Related Videos
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