Research on the process of melting large thickness slabs in a single electron beam cold hearth furnace with TC4 return material
Due to the high vacuum degree of the electron beam cold hearth furnace melting,the large thickness and cross-sectional area of the melted slab,and the irregular shape and size of TC4 return material,it is difficult to control the Al element in TC4 titanium alloy.The study investigates the single melting process of TC4 return material after specialized treatment,along with sponge titanium,Al-V intermediate alloy,and Al beans(return material accounts for 50％of the total raw material)in a 3 150 kW electron beam cold hearth furnace.The results show that during the melting process,the volatilization of Al element in TC4 titanium alloy was significant(13％-24％),and there was a slight increase in V element mass fraction.By adding the mass fractions of the Al element and V element in the raw materials to 7.5％and 4％respectively,and controlling the melting speed at 600 kg/h and the vacuum degree inside the furnace at(5-8)× 10-3 Torr(1 Torr=133.32 Pa),the obtained TC4 titanium alloy has good uniformity of the chemical composition,and the composition meets the requirements of GB/T 3620.1-2016 standard.
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