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Microstructure Evolution of TiC/Inconel 718 Composites prepared by Direct Energy Deposition

TiC/Inconel 718 alloys with different TiC contents were prepared by Direct energy deposition technology. The influence of laser power on the microstructure evolution and mechanical properties of the specimens is investigated. According to the microstructure evolution and mechanical properties, it can be observed that the different TiC content of specimens have the appropriate laser power. The excessive laser power could lead to the generation and coarsening of the Laves phase, and the increasing of dendrite spacing, which caused the formation of cracks. The appropriate laser powers are respectively 1800W and 2000W when the TiC content was 5wt.%, 10wt.%. When the TiC content is 15wt.% and laser power is 2000W, the good metallurgical bond and refined microstructure of the specimens without penetrating cracks are obtained. The penetrating cracks of the specimens have form when TiC content is 20wt.% which indicate the TiC maximum content of TiC/Inconel 718 composites should be less than 20wt.% when the laser power is not exceeded 2000W. With the increasing of laser power, the difference of theoretical density between actual density is reduced and the average hardness is not changed.This article is protected by copyright. All rights reserved.

» Author: Wenbo Liu, Bin Zou, Ting Lei, Tianhao Jia, Jikai Liu, Lei Li, Xinfeng Wang

» Publication Date: 18/03/2023

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