The microstructure of selected annealed vanadium-base alloys

The microstructures of three vanadium-base alloys in the referenced annealed state were investigated by analytical transmission electron microscopy (TEM) and X-ray diffraction. The most common precipitates in all three alloys were particles of fcc TiN_1−x−yC_xO_y. In the alloy V-15Cr-5Ti, particles of type M₂₃C₆ were also found. Additional phases in the alloys V-3Ti-1Si and V-20Ti include Ti_1.7P- and Ti₈S₃-type precipitates. Precise lattice parameters of the matrices and the titanium carbonitrides were also measured. Weight percentages of the combined precipitates were determinedvia electrolytic extraction procedures.