| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Kinetics of Phase Transformations in Boron-containing 304L Stainless Steel |
| Author(s) |
Erin Barrick, James (Tony) Ohlhausen, Donald Susan, Khalid Hattar, Jack Herrmann, Peter Duran, Jeffrey Rodelas, Charles Robino |
| On-Site Speaker (Planned) |
Erin Barrick |
| Abstract Scope |
Boron-rich phases in austenitic stainless steels can promote liquation cracking in the heat-affected zone during welding. Previous work at Sandia has demonstrated that at boron concentrations below 20 wt. ppm, 304L stainless steel that undergoes certain heat treatments is susceptible to cracking. The kinetics of phase transformations (e.g. ferrite dissolution, boride redistribution, etc.) during heat treatment that generate the crack susceptible microstructure are currently unknown. Heat treatments were performed in a Gleeble thermophysical simulator across a range of temperatures and cooling rates to investigate these transformations. Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) was used in combination with scanning electron microscopy to observe the distribution of chromium borides. Automated image analysis techniques were used to quantify microstructural changes during heat treatments. These results will be used to enable quantitative prediction of thermal processing conditions to avoid weld cracking. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525 |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Phase Transformations, Iron and Steel |