About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Phase Transformations and Microstructural Evolution
|
Presentation Title |
Selective acceleration of carbide evolution kinetics on phase boundaries by electric current treatment |
Author(s) |
Siwhan Lee, Yijae Kim, Junyoung Chae, Heung Nam Han |
On-Site Speaker (Planned) |
Siwhan Lee |
Abstract Scope |
Electric current treatment (ECT) can be an effective alternative to conventional heat treatment (CHT) due to the athermal effect of the electric current which enhances microstructural evolution kinetics in metals. However, research on the athermal effect on carbides with low electrical conductivity was insufficient. This study investigated the athermal effect on phase transformation, precipitation, and dissolution kinetics of carbides in Fe-Cr-Ni alloy. ECT and CHT were conducted on specimens at the same temperature to distinguish the athermal effect from the Joule heating effect. The phase transformation, nucleation, and growth of Cr-carbides were dramatically accelerated due to athermally enhanced atomic diffusion on phase boundaries, whereas the dissolution of Nb-carbides was not accelerated. This selective acceleration was attributed to Cr-carbides precipitation between Nb-carbides and metal matrix, which restricted the electric current flow. Microstructural analyses and FEM simulation confirmed the athermal effect was valid when carbides were in contact with the metal matrix. |
Proceedings Inclusion? |
Planned: |
Keywords |
Phase Transformations, Process Technology, Characterization |