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Oxidation performance of spark plasma sintered Inconel 625-NbC metal matrix composites

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Title: Oxidation performance of spark plasma sintered Inconel 625-NbC metal matrix composites
Authors: Grabos, Adrian Browse this author
Rutkowski, Pawel Browse this author
Huebner, Jan Browse this author
Kozien, Dawid 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: Metal matrix composites
High temperature corrosion
Issue Date: 15-Aug-2022
Publisher: Elsevier
Journal Title: Corrosion Science
Volume: 205
Start Page: 110453
Publisher DOI: 10.1016/j.corsci.2022.110453
Abstract: The study aimed to answer the question of previously obtained Inconel 625-NbC metal matrix composites (MMC) applicability in high-temperature and/or oxidative environments, that were proven to possess improved mechanical properties. To achieve that goal, a similar manufacturing process was performed, utilizing spark plasma sintering (SPS) at 1100 degrees C under 45 MPa, and in a medium vacuum (under 10-3 MPa). The total time for each sample equaled 60 min. Four sets of samples were obtained with ceramic reinforcement additions equaling 0, 5, 10, and 20 wt%. Hot rolling at 1100 degrees C with a 10% reduction step was applied to sintered materials in order to fully replicate previous technology. Oxidation tests were performed in furnaces with free flow of air for three total time periods: 24, 49, and 100 h at 800 degrees C. It was revealed that all samples kept their ability to form passive layers by matrix, but those layers were locally breached due to grain growth and thermal stresses of the oxidized reinforcement phase. Two different passive layer formations were observed and discussed: (Cr/Ni)-rich covering composite surface and (Cr/Nb)-rich forming around ceramic reinforcement. Total mass gain during oxidation was kept under 1 mg/cm2 for each sample series, with samples containing 5 wt% of NbC performing similarly to reference material. Hardness loss (up to 15%) was observed in near-surface zones of obtained MMC due to composite oxidation.
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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