| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Advancements in Steel Structural Refinement
|
| Presentation Title |
Microstructural Characterization of Austenite Decomposition Products in a 0.18C-0.15Si-1.9Mn-0.8Cr Steel Held Near MS through Mössbauer Spectroscopy |
| Author(s) |
Spencer Topper, Emmanuel De Moor, John G. Speer |
| On-Site Speaker (Planned) |
Spencer Topper |
| Abstract Scope |
Mössbauer effect spectroscopy (MES) has been implemented effectively to identify key phases in steels. Retained austenite can be distinguished in MES with a greater sensitivity than x-ray diffraction (XRD), particularly at low fractions of austenite. MES has been applied to understand the effect of isothermal holding at temperatures around the MS on carbide precipitation and stabilization of retained austenite (RA) in a 0.18C-0.15Si-1.9Mn-0.8Cr steel alloy. By using isothermal treatments above and below MS in a dilatometer, microstructures with controlled fractions of product phases were created and examined using electron backscatter diffraction (EBSD) and scanning electron microscopy (SEM). Based on this characterization, the bainitic or martensitic nature of these product phases is explored. The determination of (retained) austenite content and martensite content, along with the analysis of carbides within the microstructure, is conducted via Mössbauer spectroscopy to investigate changes in mechanical properties. |