|About this Abstract
||MS&T21: Materials Science & Technology
||Advances in Ferrous Metallurgy
||High Strength Low Alloy Steels strengthened by Heusler precipitates
||Rafael T. Rodriguez De Vecchis, Minal Shah, Yuankang Wang, Xin Wang, Soumya Sridar, Zhangwei Wang, Wei Xiong
|On-Site Speaker (Planned)
||Rafael T. Rodriguez De Vecchis
Copper-bearing high-strength low-alloys (HSLA) steels are remarkable candidate alloys for a wide range of automotive and naval applications due to their unique combination of strength, toughness, and weldability. At the core of this outstanding properties synergy, it is the well-understood role of Cu and M<sub>2</sub>C precipitates. However, in the continuous search for stronger, lighter, and low-alloying steels, precipitation strengthening of Heusler compounds has proven promising but has been so far left unexplored in the context of HSLA steels. Using a CALPHAD-based ICME framework, this work successfully introduces the intermetallic Fe<sub>2</sub>SiTi Heusler phase as an effective grain refiner and strengthening precipitate. After a heat-treatment design, co-precipitation of nanosized Cu cluster and Fe<sub>2</sub>SiTi precipitates yield a peak aged hardness values above 700 HV and compression yield strength values above 1.8 GPa with more than 12% ductility.