About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Phase Transformations and Microstructural Evolution
|
Presentation Title |
Correlative microscopic analysis of B-alloyed Fe-Mn-Al-Ni-C high-specific strength steels |
Author(s) |
Rajdeep Banik, K G Pradeep |
On-Site Speaker (Planned) |
Rajdeep Banik |
Abstract Scope |
The rising demand for energy-efficient, lightweight structural materials has sparked an interest in high-Al containing Fe-Mn-Al-Ni-C steels. An excellent combination of tensile properties, especially high specific strength (170-220 MPa g-1 cm3) and good ductility (20-30%) makes these steels ideal for automotive applications, improving fuel efficiency and reducing greenhouse gas emissions. Interface engineering by solute decoration at grain boundaries is often employed to influence the mechanical properties of the material. To this end, we have intentionally alloyed a grain boundary cohesion enhancer, viz. B (at varying concentrations between 30-100 ppm) to improve the interfacial load-bearing capability of Fe-16Mn-9Al-5Ni-0.9C (wt%) steel. Upon B-alloying, a significant improvement in high temperature stability and strength has been noticed. A multi-scale correlative microscopy analysis involving TEM-TKD-APT enabled in unearthing the unique microstructural aspects, especially the localization of B2 nanoprecipitates strengthening the grain boundary decorating BCC phase, which appears to be strengthening the steel at elevated temperatures. |
Proceedings Inclusion? |
Planned: |
Keywords |
Phase Transformations, Characterization, Iron and Steel |