| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Effect of High Temperatures on the Delamination Susceptibility of Chromium Carbide Overlays |
| Author(s) |
Alejandro Alvarez, Lingyun Wei, Jonas Svantesson, Jan-Erik Hedin, Petter Eklof |
| On-Site Speaker (Planned) |
Alejandro Alvarez |
| Abstract Scope |
Weld overlays are often used by industry to improve the mechanical and/or corrosive properties of low alloy steel substrates. Chromium-carbide overlays are commonly used in the mining and agricultural industries to extend the service life of components subjected to abrasive and/or impact wear. This study intends to explain the solidification behavior across the transition zone of Cr-carbide overlays. Furthermore, this study explains the effect of exposure to high temperatures on solid-state precipitation, hardening, and delamination. LOM/SEM analysis of the overlays reveals austenitic solidification at the fusion boundary with interdendritic eutectic phase. EDS mapping shows the decomposition of austenite through solid-state precipitation of Cr-carbides at temperatures ranging from 700 to 900 C. Thermodynamic computational modeling suggests that such temperatures enable the nucleation/growth of Cr-carbides. Microhardness testing also displays an increase in hardness at the fusion boundary from 300 HV0.3 at 700 C to 465 HV0.3 at 900 C, resulting with delamination. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Phase Transformations, High-Temperature Materials |