Abstract
Fundamental experiments on the internal oxidation process of vanadium alloys were performed for the purpose of improving the high temperature strength of vanadium alloys. The following results were obtained:
(1) Zirconium and silicon were alloyed to vanadium, respectively, as internally oxidizing elements. Zirconium was found to be more favorable than silicon because of the superior high-temperature strength of the internally oxidized V–Zr alloy.
(2) An excess of oxygen, supplied by decomposition of NiO, increased the amount of oxygen dissolved in solid-solution in the internally oxidized alloy, which caused strengthening of the alloys not at high temperature but at low temperature, accompanied by embrittlement.
