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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.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Digital Innovative Design (DID) for Reliable Casting Performance of Steel Castings
Double-Twist Torsion Testing to Assess Partial Recrystallization in Microalloyed Steels
Effect of Coiling and Annealing Temperature on Nb precipitation, Microstructure and Mechanical Properties of HSLA
Microstructure Characterization and Post-heat Treatment Design for High-Strength Low-alloy Steels Strengthened with Fe2SiTi-L21 Precipitates
Microstructure Property Relationships of Al- alloyed Medium Manganese Steels
Modeling and Experimental Validation of the Precipitation Kinetics of Vanadium Carbide in Austenitic Steel
Modelling of Precipitation and Grain Growth in Ti-Nb Microalloyed Steels
Relationship between Microstructure and Tensile Properties on High Strength Medium Carbon Mo-Nb-B Microalloyed Q/Q&T Steels
Silicide Strengthened Ferritic Alloy - A New Method of Wear Protection in Nuclear Environments
Strain Aging Embrittlement of Structural Steel
Study of the Effect of Accumulative Angular Drawing Process Conditions on Grain Refinement in Selected Stainless Steel Grade
Triple Nano-precipitate Strengthened Austenitic Steel

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