Microstructure Characterization of Laser Powder Bed Fusion Manufactured Haynes 282

Parts produced via laser powder bed fusion can have widely varying microstructures depending on the specific printing parameters used. Even in the region of parameter space where defects such as porosity are expected to be low, microstructural features including grain morphology and crystallographic texture can vary. Furthermore, many alloys commonly undergo heat treatments after printing. Thus, to understand how these alloys will perform, it is important to understand how their microstructure will change during printing and post processing operations. In this work, the effects of laser powder bed fusion processing parameters and post-processing heat treatments on the microstructure of Haynes 282 were studied. Techniques including ECCI and EBSD were used to characterize the grain structure and crystallographic texture. SEM imaging was also used to quantify the type and distribution of precipitates. The observed microstructures were correlated with tensile and creep testing results.