Characterization of MAR-M247 Deposits Fabricated Through Scanning Laser Epitaxy (SLE)

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Date

2017

Authors

Basak, Amrita
Das, Suman

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University of Texas at Austin

Abstract

This paper aims to characterize the microhardness and the process-induced residual stress in nickel-base superalloy MAR-M247 fabricated using a laser-powder bed fusion (LPBF)-based additive manufacturing (AM) process, scanning laser epitaxy (SLE). The SLE fabricated MAR-M247 samples are investigated using optical microscopy, scanning electron microscopy, x-ray diffraction, and Vickers microhardness measurements. The results show that the average Vickers microhardness values do not show any significant variation with changes in SLE processing parameters. However, the microhardness values are unevenly distributed and show variations along the build direction and the laser movement direction. Overall the hardness values are within ±2 limits for all the SLE deposited MAR-M247 samples. The effect of heat treatment on the microhardness and the residual stress is also investigated. The results show that the microhardness increases and the residual stress decreases after the heat treatment.

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