About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
2020 Technical Division Student Poster Contest
|
Presentation Title |
SPU-19: Elimination of the Sigma Phase in a Compositionally Complex Fe-Cr-based System |
Author(s) |
Stephanie Blankley, Holly Frank, Jackson Baker, Natalie Krieger, Douglas Raigosa, Patrick Conway, Kevin Laws, Lori Bassman |
On-Site Speaker (Planned) |
Stephanie Blankley |
Abstract Scope |
The Fe-Cr parent system serves as a basis for ferritic steels that exhibit high corrosion resistance. At temperatures in the range of 500 to 850 °C, these alloys have a tendency to precipitate the brittle sigma phase, limiting their processability and application. Inspired by high entropy alloy concepts, this work has successfully inhibited the formation of sigma with the addition of Mn in combination with other alloying elements. The elimination of sigma has been confirmed experimentally by scanning electron microscopy and x-ray diffraction analyses over a range of alloy compositions and heat treatment conditions. First principles modelling has shown that the interplay between alloying elements disrupts the complicated atomic packing structure within the sigma phase, diminishing its stability. |
Proceedings Inclusion? |
Undecided |