About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Steels for Sustainable Development IV
|
| Presentation Title |
Understanding the role of tramp elements introduced through increased scrap recycling |
| Author(s) |
Lukas Hatzenbichler, Marek Gocnik, Phillip Haslberger, Matthew Galler, Jozef Keckes, Ronald Schnitzer |
| On-Site Speaker (Planned) |
Lukas Hatzenbichler |
| Abstract Scope |
The transition toward increased scrap usage in steelmaking in order to reduce CO₂ emissions, inevitably elevates tramp element concentrations, posing challenges for microstructural control and performance. This study elucidates the influence of tramp elements on phase transformation behavior and microstructural evolution in steels, with implications for designing resilient, recyclable steels.
Thermally induced transformations and prior austenite grain development are characterized via dilatometry, in-situ high-energy X-ray diffraction, and high-temperature laser confocal microscopy. Segregation and nanoscale precipitation behavior are further investigated through atom probe tomography and correlative transmission electron microscopy.
Findings reveal that tramp elements accelerate martensitic transformation and stabilize retained austenite, which is associated with refined austenite grain structures. Grain boundary segregation is implicated in embrittlement, while co-precipitation of Cu and Sn at ferrite-cementite interfaces highlights complex solute interactions.
These insights advance the understanding of impurity-driven mechanisms in recycled steels, enabling alloy and process design for sustainable and circular metallurgical systems. |