Fabrication of V-Cr-Ti-Y-Al-Si alloys by levitation melting

Three alloys of V-4Cr-4Ti type containing Si, Al and Y were fabricated by 2 .5 kg scale levitation melting in this study. Workability and recrystalliza tion behavior of the alloys were studied in order to establish the fabricat ion method of high-purity large ingot of V-Cr-Ti-Si-Al-Y type alloys, espec ially reducing interstitial impurity levels. Oxygen contents decreased with increasing yttrium contents and were kept below 180 mass ppm over wide reg ion in the ingots. Nitrogen contents in the V-Cr-Ti-Y-Si-Al type alloys wer e only 100 mass ppm, which were as low as that in the starting materials. O nly the V-4Cr-4Ti-0.1Y, Si, Al alloy could be cold-rolled at as-melted cond ition. Because large yttrium inclusions were observed in the alloys contain ing 0.5 mass%Y, it is necessary to optimize yttrium contents to avoid large inclusions and to obtain good workability.