Microstructure Characterization and Post-Heat Treatment Design for High-Strength Low-Alloy Steels скачать в хорошем качестве

Microstructure Characterization and Post-Heat Treatment Design for High-Strength Low-Alloy Steels

Microstructure Characterization And Post-Heat Treatment Design For High-Strength Low-Alloy Steels Strengthened With Fe2SiTi Precipitates (ASM S3 Contest - Rafael Rodriguez - Graduate) Copper-bearing high-strength low-alloys (HSLA) steels are suitable candidates material for naval and automobile 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 precipitates remains widely unexplored. Hence, in this work, a composition close to HSLA-100 steel is 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 phase change evolution 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 450 HV in as-cast condition to 717 HV after optimum heat treatment. Presented by Rafael Rodriguez, a graduate student from the University of Pittsburgh and 2020 participant of the ASM Student Speaking Symposium (S3). To learn more about the ASM S3 Contest, please visit www.asminternational.org/virtual-presentation-contest