Melting technology of electron beam cold hearth melting of TC4 titanium alloy

The technology of preparing TC4 alloy ingot by electron beam cold hearth melting furnace (EBCHM) in industrialized conditions process was studied. The relationship between the smelting process parameters and the homogeneity of the chemical composition of ingot was analyzed, and a brief theoretical calculation and analysis of the volatilization of Al element was studied. The results show that the volatilization of Al in EB melting process is serious and the actual volatilization rate is 16.9%, which is higher than the theoretical value of 11.8%. The melting current, vacuum degree and the matching of process parameters is the key factor to affect Al element volatilization. The chemical composition of ingot prepared by reasonable process parameters has good uniformity, the radial component uniformity is superior to the axial direction, the distribution of V elements is better than that of Al, the standard deviation of Al is within 0.25% and the standard deviation of V is less than 0.10%. And the composition accuracy and uniformity are in full compliance with the requirements of national standards. © 2020, Science Press. All right reserved.