Investigation of secondary precipitation during tempering of a nano-bainitic steel
The proposed experiment aims at investigating the precipitation of secondary carbides (M2C, VC) during the tempering of nanobainitic steels. Nano-structured bainite is composed of nano-scaled laths of ferrite (20-60 nm thick) and a high proportion of untransformed austenite (15-40%), which impart very high strength and excellent ductility to these steels.To our knowledge, secondary precipitation inside a nanobainitic microstructure has scarcely been investigated so far, and SANS has never been used during nanobainite tempering. The experiments will consist in studying the secondary precipitation inside an initial microstructure of nanobainite, on samples subjected to continuous heating and tempering treatments in our laboratory. In addition, initial microstructures of martensite will be also considered prior to tempering and will serve as a basis to analyze and understand. The results will serve in developing and validating a metallurgical model of precipitation which takes into account the concomitant evolution of the matrix phases (bainitic ferrite and retained austenite), precipitation carbides but also the mechanical properties prediction (yield strength).
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GAUDEZ Steve; BENRABAH Imed-Eddine; BRACCINI MURIEL; DE GEUSER Frederic; DESCHAMPS Alexis; GEANDIER Guillaume; HONECKER Dirk; JACQUET Lucie; MACCHI Juan; PORCAR Lionel; SCHWEINS Ralf and STEINKE Nina-Juliane. (2020). Investigation of secondary precipitation during tempering of a nano-bainitic steel. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-01-177
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