Developing a Third-Generation Advanced High-Strength Steel With Two-Stage TRIP Behavior

摘要

Previous success in achieving exceptional tensile properties of >1100 MPa ultimate tensile strength and >30% elongation to failure in alloys that exhibit a two-stage transformation induced plasticity mechanism (γ→ε→α') has prompted the continued development of this alloy system. First principles investigations of stacking fault energy revealed Si has the same effect as Al in decreasing the barrier to nucleate ε-martensite from parent austenite while decreasing the relative stability of ε-martensite compared to austenite.