Introducing Heusler intermetallics for synergic effect of grain refinement and precipitation strengthening in high-strength low-alloy steels

• An HSLA steel was designed with the Fe 2 SiTi phase as its major strengthening phase. The Heusler phase, SiTi, can act grain refiner and precipitation strengthener. Precipitation behavior of compound is affected by Nb partitioning. Record high vol% nanosized precipitates lead to record hardness. remarkable combination strength, toughness, weldability that characterizes high-strength low-alloy (HSLA) steels make them suitable structural materials for naval automobile applications. well-studied effect a microstructure, comprised co-precipitated Cu M C carbides combined low carbon content, stands at root this superior synergy properties. However, advance in innovation stronger, lighter, compositionally lean steels, new routes need be explored. In regard, compounds have proven promising selected group alloys but so far been untested steels. Hence, work, two compositions close HSLA-115 had Modeling experiments were carried out describe evolution transformation behavior. Results indicate peak aged hardness 717 HV arising from contribution acting well ~8 vol.% formed concomitantly clusters. Furthermore, influence on stability elucidated through study kinetics. Overall, work introduces design pathway development ultra-high-strength using compounds, which benefit synergic refinement strengthening.