|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Austenite Carbon Measurement in Q&P Steels: Atom Probe Tomography vs. High Energy XRay Diffraction
||Frederic Danoix, Sébastien Allain, Guillaume Geandier, Jean Christophe Hell, Michel Soler, Samy Aoued, Mohamed Goune
|On-Site Speaker (Planned)
Quenching & Partitioning (Q&P) is a new annealing route proposed to produce third generation advanced high-strength steels (AHSS) for the automotive sector. The goal of this process is to allow carbon enrichment in austenite, in order to make it more stable at room temperature. The Q&P annealing cycle consists, after an austenitic soaking, in an interrupted quenching at a temperature between Ms and Mf, to retain some residual austenite. During a subsequent isothermal holding at a higher temperature, carbon is allowed to diffuse to austenite. Measuring quantitatively carbon in different phases in steels has always been challenging, in particular when their dimensions become sub micrometric. Atom probe tomography gives directly access to this information, at the atomic scale. The values obtained by APT will be compared to the ones derived from in situ high energy XRay diffraction analysis, and the discrepancies between the two methods will be discussed.
||Planned: Supplemental Proceedings volume