Characterization of multi-scale transformations in a maraging stainless steel for landing gear applications.
This experiment aims to study a stainless maraging steel whose final microstructure highly depends on austenitization heat treatment. Results provided by dilatometry show that complex phase transformations (precipitation, austenitization and martensitic transformation) depend on treatment parameters such as heating/cooling rates and holding times/temperatures. During heating, the first steps of austenite nucleation must be understood with respect to precipitation/dissolution sequences. Indeed, the link between austenite formation and precipitates dissolution is still unclear. Moreover, the amount of residual austenite after quench and the martensitic starting point value (Ms) highly depend on the quality of high-temperature austenite: it would thus be interesting to understand in which range of temperatures martensite transforms into austenite during heating or holding. Besides, the presence of non-dissolved precipitates after quench from 850°C seems to indicate that there is still martensite at 850°C, that is why in-situ tracking of phases evolutions is necessary. By allowing time-resolved kinetics studies and in-situ tracking of phase transitions, D1B instrument comes essential.
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DELAGNES Denis; ANCEY-ROCCHI; Claire V. Colin and NASSIF Vivian. (2019). Characterization of multi-scale transformations in a maraging stainless steel for landing gear applications.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-151
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