Metal Additive Manufacturing Conference - MAMC 2020

This paper presents correlative microscopy studies performed for the characterization of powders and additive manufactured parts. Starting from µm scale down to atomic resolution, micrographs and chemical analyses provide important information about the micro- and nano-structure as well as about mechanisms that can influence the properties of the final parts. Different investigation techniques such as scanning electron microscopy coupled with Rahman spectroscopy and scanning TEM microscopy coupled with X-ray (EDX) and electron energy-loss spectrometry (EELS) have been used to characterize the surface oxidation and microstructure of the powder grains as well as the microstructure of the as-built or thermal treated parts. Stable and metastable phases have been identified by chemical and crystal structure analysis. Moreover, in-situ measurements provided information regarding the evolution of the powder surfaces, the evolution of the microstructure and diffusion of alloying elements at different temperatures.