|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||Significant Influence of Carbon and Niobium on the Precipitation Behavior and Microstructural Evolution and their Consequent Impact on Mechanical Properties in Microalloyed Steels
||Devesh Misra, Vignesh Natarajan, DM Sidorenko, MD Mullholland, M Manohar, JE Hartmann
|On-Site Speaker (Planned)
Carbon and niobium (Nb) play an important role in influencing the ultimate microstructure and mechanical properties. In this regard, we elucidate here the impact of C and Nb on the microstructural evolution and precipitation behavior during continuous cooling of industrially processed microalloyed steels with varying carbon and Nb-content. The increase of carbon content in the steel increased the precipitation temperature of (Nb, Ti)(C, N). Furthermore, high carbon content contributed to the stabilization of austenite and delayed the transformation of ferrite and bainite, such that martensite/austenite content (M/A) was obtained. The high degree of (Nb, Ti)(C, N) precipitation in steel contributed to refinement of prior austenite grain size and strain accumulation, which increased ferrite and bainite start transformation temperature, resulting in higher volume fraction of polygonal ferrite. Granular bainite and lath bainite in steel with intermediate C and Nb-contents was characterized by best combination of strength and elongation.
||Planned: Supplemental Proceedings volume