Abstract
The effect of double addition of V and Cr on the mechanical properties and microstructure of Mo2NiB2 base cermet was investigated. Total additional amount of V and Cr was fixed to 12.5 mass% and the fraction between the two additives was varied. Transverse rupture strength (TRS) and Rockwell A-scale hardness (HRA) were measured on the cermets and discussed together with their microstructure obtained by X-ray diffraction (XRD) and backscattered electron images (COMP). Addition of 2.5–mass% Cr and 10–mass% V showed the highest mechanical properties. Microstructural analysis revealed that brittle orthoronbic-M5B3 phase was formed in high V fraction. The corrosion resistance of the cermets against hydrochloric acid was superior to that of JIS SUS 304. The resistance against nitric acid decreased with decreasing Cr content and was lower than that of SUS 304.
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