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A High-Resolution Method to Map Out the γ/γ Lattice Misfit in Ni-Based Superalloys

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Document pages: 44 pages

Abstract: Lattice misfit is an essential parameter property that affects the mechanical behavior of two-phase superalloys. Here we report a new method to use sub-micrometer-focused synchrotron X-ray beam to directly measure the γ γ′ misfit in Ni-based superalloys. By combining polychromatic X-ray Laue diffraction and monochromatic energy scan, the lattice constants of both phases and the lattice misfit are mapped out at high spatial resolution, which is only limited by the X-ray beam size and scanning step size. We also developed data analysis algorithms to elevate the reliability of peak fitting and the precision and accuracy of lattice constants misfit measurements. The success of our method is illustrated by uncovering the pronounced variations and non-monotonic profiles of the misfit and phase fractions throughout the heat affected zone in a laser 3D-printed Ni-based superalloy. The nano-hardness distribution in the transition region from the base metal to the cladding layers is empirically correlated with the phase fractions that are reflected by the diffraction peak intensities.

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