REGULARITIES OF TI1–NMEV NC0,5N0,5 CARBONITRIDE METALLURGICAL REACTIONS WITH NI–MO MELT
https://doi.org/10.17073/1997-308X-2017-3-22-31
Abstract
Electron microprobe analysis and scanning electron microscopy are used for the first time to systematically study the effect of TiC0,5N0,5 carbonitride doping with V group transition metals (V, Nb, Ta) on the mechanism of contact interaction with the Ni–25%Mo melt (Т = 1450 °С, τ = 1 h, vacuum 5·10–2 Pa). It is found that the dissolution of similar Ti1–nMeV nC0,5N0,5 (n = 0,05) carbonitrides is an incongruent process (alloying metal and carbon predominantly transfer to the melt) with non-monotonic changes in relative velocity and incongruence of carbonitride dissolution for the V–Nb–Ta alloying metal series. The paper suggests an explanation of the effects identified. The causal relationship between the initial composition of Ti0,95MeV 0,05C0,5N0,5 carbonitride (kind of alloying metal) and the composition of K phase (Ti1–n–mMonMeV mCx) precipitated from the melt during the system cooling is analyzed. It is shown that the factor determining the composition of the produced K phase is the ΔT factor (the difference between the crystallization temperatures of Ni/MeVC carbide eutectics and Ni/Mo2C, the most easily-fusible eutectic in these systems). The paper rationalizes the conclusion that the found relationship between the initial carbonitride composition and the composition of K phase formed is a consequence of the microheterogeneous structure of the metal melts. It is demonstrated that this relationship has a relatively general nature and appears in all the studied systems whatever the Group V alloying metal grade and whether the melt contains molybdenum or not.
About the Authors
V. A. Zhilyaev
ISSC UB RAS
Russian Federation
Russian Federation
Dr. Sci. (Tech.), Cand. Sci. (Chem.), Leading researcher, Laboratory of physical and chemical analysis methods,
620990, Yekaterinburg, Pervomayskaya str., 91
E. I. Patrakov
IMP UB RAS
Russian Federation
Russian Federation
Cand. Sci. (Chem.), Senior researcher, Department of Nanospintronics,
620990, Yekaterinburg, S. Kovalevskoy str., 18
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Review
For citations:
Zhilyaev V.A., Patrakov E.I. REGULARITIES OF TI1–NMEV NC0,5N0,5 CARBONITRIDE METALLURGICAL REACTIONS WITH NI–MO MELT. Powder Metallurgy аnd Functional Coatings. 2017;(3):22-31. (In Russ.) https://doi.org/10.17073/1997-308X-2017-3-22-31
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