Structure and Phase Composition of V-Al-N-C Master Alloy

Taranov D V, Larionov A V, Chumarev V M, Smirnov L A, Trubachev M V, Vohmentsev S A
2019 KnE Materials Science  
The article presents the results of studying the phase composition and microstructure of the V-Al-N-C alloy, intended mainly for doping titanium alloys, but also of interest to manufacturers of structural steels. The V-Al-N-C alloy was obtained by the method of out-of-furnace aluminothermic smelting of a mixture containing vanadium pentoxide, aluminum powder, nitrided by the SHS method powdered V-Al-(17-20)N (wt.%) alloy and graphite in copper uncooled molds. The phase composition was
more » ... by X-ray phase analysis (diffractometer -DRON-2.0, radiation -Cu-Kα, monochromator -graphite). The microstructure and composition of the phases were investigated by X-ray microanalysis using a JSM-59000LV scanning electron microscope ( Japan) and an Oxford INCA Energy 200 energy-dispersive X-ray spectrometer (United Kingdom). It is revealed that the matrix of the V-Al-N-C alloy, containing (wt. %): 73.9 V; 23.7 Al, 1.2 N, 0.69 C, and 0.08 O 2 , are represented by the solid solution of aluminum in vanadium. The main nitrogen-containing phase is aluminum nitride AlN of a cubic structure. The carbide phase can be identified as V 2 Al 0.9 C 1.1 . Nitride and carbide phases are distributed quite uniformly in the alloy matrix. The carbide phase in the structure of the V-Al-N-C alloy is predominantly in the form of threadlike crystals up to 100 μm in length. The nitride phase is represented by small (up to 10 μm) and large (30 ÷ 100 m) inclusions of irregular geometric shape with rounded and pointed edges forming conglomerates of branched irregular shapes, which are located around the aluminum oxide Al 2 O 3 .
doi:10.18502/kms.v5i1.3958 fatcat:yhz2oz5wyjewppdfvpj2fm7sti