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Microstructure and Hardness of Spark Plasma Sintered Inconel 625-NbC Composites for High-Temperature Applications

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Title: Microstructure and Hardness of Spark Plasma Sintered Inconel 625-NbC Composites for High-Temperature Applications
Authors: Grabos, Adrian Browse this author
Huebner, Jan Browse this author
Rutkowski, Pawel Browse this author
Zhang, Shenghua Browse this author
Kuo, Yen-Ling Browse this author
Kata, Dariusz Browse this author
Hayashi, Shigenari Browse this author →KAKEN DB
Keywords: Inconel 625
niobium carbide
spark plasma sintering
metal matrix composites
Issue Date: Aug-2021
Publisher: MDPI
Journal Title: Materials
Volume: 14
Issue: 16
Start Page: 4606
Publisher DOI: 10.3390/ma14164606
Abstract: The study focuses on obtaining Inconel 625-NbC composites for high-temperature applications, e.g., jet engines, waste-to-energy combusting systems or gas engine turbines, and characterizing them in terms of their microstructure and hardness improvement. Synthesis was performed utilizing Spark Plasma Sintering (SPS) at 1150 degrees C under the load of 45 MPa in medium vacuum (under 10(-3) MPa) for a total time of 60 min. Four sets of samples with different Inconel 625 to NbC weight ratios were prepared (5, 10, 20, and 30 wt.%), followed by a reference sample containing no ceramic reinforcement. Obtained materials were hot-rolled at 1150 degrees C with a 10% reduction step and later cut and polished to perform characterization utilizing scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS) module and microhardness testing device equipped with Vickers indenter. Hardness was improved proportionally to NbC addition achieving an increase of up to 20% of reference values. Additional heat treatment was conducted on the hot-rolled samples at 1200 degrees C in an argon atmosphere to further observe the interaction between reinforcement and alloy. Their microstructure revealed the coarsening of precipitates within the metal matrix and partial reinforcement dissolution, which proved to be crucial to obtaining the highest quality composites with homogenous hardness improvement.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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