| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Advanced Steel Metallurgy
|
| Presentation Title |
Microstructure Characterization and Post-heat Treatment Design for High-Strength Low-alloy Steels Strengthened with Fe2SiTi-L21 Precipitates |
| Author(s) |
Rafael T. Rodriguez De Vecchis, Soumya Sridar, Xin Wang, Zhangwei Wang, Wei Xiong |
| On-Site Speaker (Planned) |
Rafael T. Rodriguez De Vecchis |
| Abstract Scope |
Copper-bearing high-strength low-alloys (HSLA) steels are suitable candidate materials for naval applications as they exhibit high strength and toughness as well as good weldability. In an effort to further increase their strength, precipitation hardening with intermetallic phases is reported to be promising. Though the strengthening effect of Cu and M2C precipitates in HSLA steels are well studied, the effect of Fe2SiTi-L21 precipitates remains unexplored. Hence, in this work, two different compositions close to HSLA-100 steel are designed using a CALPHAD-based ICME (CALPHAD: Calculations of Phase Diagrams; ICME: Integrated Computational Materials Engineering) framework with Fe2SiTi as the major secondary phase. The evolution of phase change and precipitation kinetics were systematically studied via the CALPHAD-approach and experiments. The latter confirms the principal role of co-precipitation of Cu and Fe2SiTi nano-sized precipitates at boosting the hardness from 428 HV in as-cast condition up to 717 HV after optimum heat treatment. |