|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels V
||High Strength Transformation Induced Plasticity-maraging Stainless Steel
||Menglei Jiang, Hyunseok Oh, Cemal Cem Tasan
|On-Site Speaker (Planned)
Introducing reverted austenite at martensite boundaries can highly increase the toughness of precipitation hardening martensitic stainless steel. However, the strength of material typically decreases after austenite reversion annealing, which mainly caused by the formation of low strength austenite and over-aging of intermetallic precipitates in martensite. Introducing interlath thin-film austenite, which provides great ductility with a relatively low volume fraction, is a promising way of designing high strength high toughness stainless steel. Here, with multi-probe in-situ SEM tensile tests, we analyze the strain partitioning between austenite and martensite and understand the influence of interlath austenite on the strength. Incorporating high energy X-ray diffraction and Calphad method, we study the effect of lattice misfit between the martensitic matrix and precipitate on precipitation kinetics. Following this approach, we design new transformation induced plasticity-maraging stainless steels with high strength and ductility via optimized reverted austenite and maximized maraging effect.
||Phase Transformations, Mechanical Properties, Iron and Steel