|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Ultrafine-grained and Heterostructured Materials (UFGH XII)
|Ultra-strong Low Carbon Nano-steel Produced by Heterostructure and Interstitial Mediated Warm Rolling
|On-Site Speaker (Planned)
Ultra-strong materials can significantly help with improving the energy efficiency of transportation vehicles by reducing their weight. Grain refinement by severe plastic deformation is so far the most effective approach to produce bulk strong nanostructured metals, but its scaling-up for industrial production has been a challenge. Here we report an ultra-strong (2.15 GPa) low-carbon nano-steel processed by heterostructure and interstitial mediated warm rolling. The nano-steel consists of thin (~17.8 nm) lamellae, which was enabled by two novel mechanisms: i) improving deformation compatibility of dual-phase heterostructure by adjusting warm-rolling temperature, and ii) segregating carbon atoms to lamellar boundaries to stabilize the nano-lamellae. Defying our intuition, warm-rolling produced finer lamellae than cold rolling, which demonstrates the potential and importance of tuning deformation compatibility of interstitial-containing heterostructure for nanocrystallization. This novel approach is applicable to most low-carbon, low alloy steels for producing ultra-high strength materials in industrial scale.
|Iron and Steel, Mechanical Properties, Other