Maetz J-Y, Douillard T, Cazottes S, Verdu C, Kléber X
Université de Lyon, INSA de Lyon, MATEIS, UMR CNRS 5510, 69621 Villeurbanne Cedex, France.
Université de Lyon, INSA de Lyon, MATEIS, UMR CNRS 5510, 69621 Villeurbanne Cedex, France.
Micron. 2016 May;84:43-53. doi: 10.1016/j.micron.2016.01.007. Epub 2016 Feb 6.
The precipitation evolution during ageing of a 2101 lean duplex stainless steel was investigated, revealing that the precipitate type and morphology depends on the nature of the grain boundary. Triangular M23C6 carbides precipitate only at γ/δ interfaces and rod-like Cr2N nitrides precipitate at both γ/δ and δ/δ interfaces. After 15min of ageing, the M23C6 size no longer evolves, whereas that of the Cr2N continues to evolve. For Cr2N, the morphology is maintained at γ/δ interfaces, whereas percolation occurs to form a continuous layer at δ/δ interfaces. By combining 2D and 3D characterisation at the nanoscale using transmission electron microscopy (TEM) and focused ion beam (FIB) tomography, a complete description of the precipitation evolution was obtained, including the composition, crystallographic structure, orientation relationship with the matrix phases, location, morphology, size and volume fraction.
