Abstract
With the object of obtaining homogeneous ingots of titanium alloys which contain more than a few percent of high melting temperature elements such as W, Ta, Mo and Nb, the consumable electrode of vacuum arc melting was improved by using a mixed powder method. The macrosegregation of these elements in the commercial scale ingot was studied with a chemical analysis and a radiograph technique.The optimum volume percentage of Mo in the above mentioned mixed powder was 40%, in order to get the homogeneous ingot of Ti-15Mo-5Zr alloys. The estimated melting temperature of the mixed powder was about 2, 170°CTa content was minimum at the center portion in the top of the Ti-5Ta ingot, because the partition coefficient of Ta was larger than 1. However, the degree of the Ta segregation in the above alloy was much smaller than the Co segregation in Ti-8Al-4Co alloys.The ring pattern detected by radiography in Ti-5Ta billet was identified to be the indication of the slight concentration difference of Ta, which was caused by turbulence in the liquid-solid interface during solidification.
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