On the interstitial induced lattice inhomogeneities in nitrogen-expanded austenite
Copyright policy )On the interstitial induced lattice inhomogeneities in nitrogen-expanded austenite
Lattice inhomogeneities, i.e. nitrogen interstitial-induced hexagonal-close-packed martensite (HCP-εN) and shear bands, can form in face-centred cubic nitrogen-expanded austenite (FCC-γN) synthesised on Fe-Cr-Mn and Fe-Cr-Ni austenitic stainless steel (ASS) using triode-plasma nitriding (TPN). Homogenous elemental distribution between HCP-εN and FCC-γN supports the displacive shear transformation mechanism proposed for a high-Mn, low stacking fault energy ASS under nitrogen interstitial-induced deformation. While resulting from transformation-induced plasticity, HCP-εN exhibits similar lattice expansion behaviour to the parent FCC-γN. However, inhomogeneous elemental distributions in the shear bands formed in γN layers on a 400°C TPN-treated high-Ni ASS indicate local migration of substitutional elements.
- White Rose Consortium: University of Leeds; University of Sheffield; University of York United Kingdom
- University of Manchester United Kingdom
- University of Sheffield United Kingdom
- University of Birmingham United Kingdom
- University of Manchester United Kingdom
Expanded austenite, Shear banding, Martensitic phase transformation, High-resolution electron microscopy (HREM), Nitriding
Expanded austenite, Shear banding, Martensitic phase transformation, High-resolution electron microscopy (HREM), Nitriding
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