B22-P-01Understanding of off-stoichiometry of Nano-sized Carbides in Fe-Mn-Al-C Low-Density Steels using Transmission Electron Microscopy, Atom Probe Tomography, and Density Functional Theory

Combination of EBSD and EDS are known as a powerful strategy to investigate the relationship between crystalline characteristics and chemical composition of metal-based materials [1]. In present study, combining EBSD and EDS was applied to analyse a chloride induced stress corrosion crack on a stainless steel cladding which is applied on protecting the reactors for carrying out petrochemical reactions. The results of the crack initiation from EDS and EBSD analysis are shown in figure (a) and (b), in which sigma phase is found forming at the grain boundary. It is also noticed that the corrosion type at the crack initiation is intergranular corrosion. Figure (c) and (d) display the EDS/EBSD results of the propagation part of the crack, showing that the chemical composition at this part are mainly Cr and Mo, and the corrosion type of the crack turns into transgranular corrosion. A detailed discussion of this work will be present in the conference.