NbC TRANSFORMATION DURING AGING IN HP40-Nb HEAT RESISTANT ALLOY
نویسندگان
چکیده
In this work, the evolution of MC-type Nb-rich primary carbides in a 35Ni-25Cr-Nb-type refractory alloy, commonly known as HP40-Nb, and its transformation into Ni-Nb silicide G-phase (Ni16Nb6Si7), has been studied. For purpose, experimental technique scanning electron microscopy was used together with X-ray microanalysis to detect changes chemical composition niobium carbide over time at given aging temperature. The microstructure studied as-cast condition, consists an austenitic matrix strengthened by network eutectic-like rich chromium M23C6 MC types, respectively. During alloy high temperatures, microstructural take place such secondary precipitation type towards Ni-Nb-rich silicide. It found that begins interface matrix, progressing their interior development aging.
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ژورنال
عنوان ژورنال: Acta Metallurgica Slovaca
سال: 2022
ISSN: ['1338-1156', '1335-1532']
DOI: https://doi.org/10.36547/ams.28.3.1562