| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Austenite Formation and Decomposition V: A Symposium in Memory of Prof. Mats Hillert
|
| Presentation Title |
The Influence of Rapid Tempering on Retained Austenite Decomposition in 4340 Steel |
| Author(s) |
Virginia K. Euser, Don Williamson, Amy Clarke, John Speer |
| On-Site Speaker (Planned) |
Virginia K. Euser |
| Abstract Scope |
The influence of rapid tempering on retained austenite decomposition is explored in a 4340 steel. Microstructural development, monitored via Mössbauer spectroscopy and x-ray diffraction, is compared at a consistent tempered hardness across rapidly (1, 10, and 100 s) and conventionally tempered (3600 s) conditions. Time-temperature combinations that provide an equivalent tempered hardness exhibit microstructures with similar dislocation densities and cementite fractions. However, systematic differences in retained austenite content are observed at a given degree of softening, where shorter tempering times exhibit higher levels of retained austenite compared to more conventional conditions. Differences in the kinetic limiting factor for retained austenite decomposition are believed to contribute to the observed microstructural phenomena. |