Relationship between the Yield Strength-Fracture Toughness Balance and the Multiscale Microstructure of a Maraging Stainless Steel for Aircraft Applications

Abstract : Two grades of Fe-Cr-Ni-Al-Ti-Mo maraging steels, with a different titanium content, were investigated. Particular attention was given to the correlation between the precipitated phases and the yield strength. Synchrotron X-ray diffraction, small-angle neutron scattering and atom probe experiments were performed to determine the crystal structure, shape, size distribution, chemical composition, particle number density and volume fraction of precipitates. Both alloys show a strong increase in strength after an aging treatment, which is attributed to the co-precipitation of two different intermetallic phases. Strengthening by a single precipitation of β-Ni(Al,Ti) particles induces a saturation of yield strength around 1600 MPa above a volume fraction of 6 %. The improvement of yield strength is then obtained by introducing a nanoscale co-precipitation of η-Ni 3 (Ti,Al) phase.
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Charline Le Nué, Jean Marc Cloue, Marie Helene Mathon, Sylvain Puech, Denis Béchet, et al.. Relationship between the Yield Strength-Fracture Toughness Balance and the Multiscale Microstructure of a Maraging Stainless Steel for Aircraft Applications. THERMEC 2016 - 9th Internation Conference on Processing and Manufacturing of Advanced Materials, May 2016, Graz, Austria. p. 413 - 418, ⟨10.4028/www.scientific.net/MSF.879.413⟩. ⟨hal-01629312⟩

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