Elaboration and Metallographic Study of {M-25Cr}-based Alloys Containing Hafnium Carbides (M=Co, Ni or Fe): Microstructures in the As-cast State and after Exposure at 1200°C - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Advances in Alloys and Compounds Année : 2013

Elaboration and Metallographic Study of {M-25Cr}-based Alloys Containing Hafnium Carbides (M=Co, Ni or Fe): Microstructures in the As-cast State and after Exposure at 1200°C

Patrice Berthod
Elodie Conrath
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Résumé

Six chromium-rich M-based alloys (M=Co, Ni or Fe) with conventional carbon contents (0.25 and 0.50wt.%) and containing near 4wt.% of hafnium were elaborated in foundry. As expected, dense precipitation of hafnium carbides was achieved, with repartitions and shapes similar to what it is generally obtained with tantalum carbides. Chromium carbides were also obtained in some alloys. After exposure of samples at 1200°C for about 48 hours the HfC carbides network was kept without significant changes of morphology and surface fractions, in the cobalt-based and nickel-based alloys, in contrast with the iron alloys which appeared less stable. Indentation performed in as-cast and aged samples showed that these HfC-containing alloys display various hardness values. The HfC-containing cobalt alloys are the hardest ones and the high temperature exposure induced a limited lowering of this property. The cast HfC-containing cobalt alloys are potentially very interesting for applications at very high temperature requiring foundry equi-axed chromium-rich alloys.
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hal-02352395 , version 1 (13-11-2019)

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Patrice Berthod, Elodie Conrath. Elaboration and Metallographic Study of {M-25Cr}-based Alloys Containing Hafnium Carbides (M=Co, Ni or Fe): Microstructures in the As-cast State and after Exposure at 1200°C. Advances in Alloys and Compounds, 2013, 1, pp.3 - 14. ⟨10.7726/aac.2013.1002⟩. ⟨hal-02352395⟩
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