The effect of composition and microstructure on hardness and toughness of Mo2FeB2 based cermets

Mo2FeB2 based cermets with various Ni, Cr and C concentrations were prepared. The effect of Ni, Cr and C on the phase composition and microstructure was investigated by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS) and X-ray diffraction (XRD). Hardness (HRA) and fracture...

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Veröffentlicht in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-08, Vol.763, p.138117, Article 138117
Hauptverfasser:	Ivanov, Maxim B., Vershinina, Tatiana N., Ivanisenko, Victor V.
Format:	Artikel
Sprache:	eng
Schlagworte:	Alloying Austenite Borides Cermets Chromium Composition effects Fracture toughness Hardness Heat treating Mechanical properties Microstructure Mo2FeB2 based cermet Nickel Phase composition Phase transitions X ray analysis
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Zusammenfassung:	Mo2FeB2 based cermets with various Ni, Cr and C concentrations were prepared. The effect of Ni, Cr and C on the phase composition and microstructure was investigated by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS) and X-ray diffraction (XRD). Hardness (HRA) and fracture toughness (K1c) were also measured. It was found that nickel alloying leads to formation of two-phase state represented by Mo2FeB2 boride and austenite. Chromium alloying results in austenite to ferrite transformation and M23C6 and M6C carbide precipitation in the case of carbon doping. Also, it was found that chromium influences the borides mean size. Observed changes in the phase composition and microstructure affect the hardness and fracture toughness of investigated materials.
ISSN:	0921-5093 1873-4936
DOI:	10.1016/j.msea.2019.138117