“…Microstructure design of advanced high strength steels (AHSS) has been developed aiming for an excellent combination of strength and ductility. [1][2][3][4][5][6][7] Especially, metastable austenite in final microstructure has been considered one of the most reliable strategies to maximize the tensile properties by means of transformation-induced plasticity (TRIP) effect. 8) For the retention of austenite at room temperature, various approaches to secure the austenite stability, for instance enrichment of alloying elements or morphological control, were suggested.…”