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Modern engineering alloys have bespoke microstructures, where features suchas precipitates are used to control properties. In many Ni-based alloys,carbo-nitride precipitates are introduced to strengthen and improveperformance. These precipitates can be distributed throughout themicrostructure and niobium rich carbides are often found at grain boundaries.In this work, we used combined energy dispersive X-ray spectroscopy (EDS) andelectron backscatter diffraction (EBSD) to characterise the population of theseprecipitates. Processing of the EDS signal is used to label the Mo/Nb-richprecipitates, and their size and location are measured from maps using acircular Hough transform. This label map is combined with the grain boundarynetwork (from EBSD analysis). Statistical analysis, using ANOVA testing,reveals differences in chemistry between carbides found in Ni-rich matrix graininteriors, on random high angle boundaries and on special boundaries ({\Sigma}3and {\Sigma}9). These results are compared between wrought and power metallurgyproduct forms. These distributions are discussed in the context of theirperformance within demanding environments, such as reactor core internals.

Correlative statistical microstructural assessment of precipitates and  their distribution, with simultaneous electron backscatter diffraction and  energy dispersive X-ray spectroscopy