|About this Abstract
|2020 TMS Annual Meeting & Exhibition
|Advanced High Strength Steels IV
|Austenite Stability of an 1180 MPa Quenched-and-partitioned Steel
|Ana Araujo, Jun Hu, Erik J Pavlina
|On-Site Speaker (Planned)
One approach to produce steels with a combination of high strength and high formability is via a multiphase microstructure containing metastable austenite. Metastable austenite transforms to martensite differently under different loading conditions, testing temperature, and strain rates. A quenched-and-partitioned (Q&P) steel with a minimum ultimate tensile strength of 1180 MPa was chosen in this study to demonstrate this behavior. Five loading conditions, including uniaxial tension, uniaxial compression, simple shear, equi-biaxial tension, and plain strain tension, testing temperatures ranging from -25 to 225 °C, and nominal strain rates ranging from 0.001 to 1000/s were used. Retained austenite content was evaluated via x-ray diffraction (XRD) and electron backscattered diffraction (EBSD) for each condition and at various strain levels. Lastly, a phenomenological model was proposed to fit the transformation behavior coupled with plastic strain under these different conditions.
|Planned: Supplemental Proceedings volume