| About this Abstract |
| Meeting |
Materials Science & Technology 2019
|
| Symposium
|
Retained Austenite for High and Ultrahigh Strength Steels
|
| Presentation Title |
Tensile Deformation Characteristics and Austenite Transformation Behavior of Advanced High Strength Steel Considering Adiabatic Heating |
| Author(s) |
Christopher Barret Finfrock, Gus Becker, Trevor Ballard, Grant A Thomas, Kester D Clarke, Amy J Clarke |
| On-Site Speaker (Planned) |
Christopher Barret Finfrock |
| Abstract Scope |
Heightened fuel economy standards necessitate development of economically viable sheet steels with exceptional mechanical properties. The quenching and partitioning (Q&P) heat treatment creates carbon-enriched metastable austenite, which transforms to martensite during deformation, leading to enhanced strength and ductility. At present, the automotive steel community endeavors to categorically characterize the relationship between Q&P processing, austenite stability, and mechanical performance. During industrially relevant forming, deformation temperatures tend to diverge from ambient conditions and strain rates tend to exceed quasi-static rates. In this study, tension testing of Q&P steels in strength levels of 1000 and 1200 MPa was performed for varied sheet orientations at strain rates from 0.0001 to 0.1 1/s, while adiabatic heating was evaluated using thermocouples and a thermal camera. Subsequently, scanning electron microscope fractography was used to identify a mechanism for ductile failure, and retained austenite was measured with X ray diffraction to evaluate austenite transformation. |