Advanced High Strength Steels: TRIP/TWIP Effect

This lecture covers the advanced high strength steels, focusing on the TRansformation-Induced Plasticity (TRIP) and TWinning-Induced Plasticity (TWIP) effects. It discusses the influence of Mn content, the transformation behavior of austenite to martensite, the fcc-y hcp-ɛ transformation, and the hcp-a bct-a' transformation. The lecture also explores the role of stacking fault energy on the deformation mechanism, the mechanical properties of TRIP/TWIP steels, and the applications of Advanced High Strength Steels (AHSS) in car body structures. Additionally, it delves into the 3rd generation of AHSS, including Medium Mn TRIP steels, Quenched and Partitioned (Q&P) steels, and Maraging TRIP steels, as well as FeMnSi-based shape memory alloys for civil engineering applications.