Development Of New Master Alloy For TA10 Titanium Alloy

In this paper,based on fully studying the current domestic and foreign TA10(Ti-0.3Mo-0.8Ni)smelting methods and types of alloy additives,trial-produced new alloy additives were proposed to solve the problems that the Ti-32 Mo and electrolytic nickel intermediate alloy additives used in the existing fused-casting titanium alloy production process have high cost and are prone to elemental segregation after casting in the current TA10 corrosion-resistant titanium alloy casting process.According to the batching requirements of the TA10 ingot and the standard of the intermediate alloy for titanium alloy,the nominal composition of the alloy additive30Mo-70 Ni was determined.The molybdenum and nickel processing residual materials that have passed the magnetic separation and X-ray flaw detection are used as raw materials.Exploring the process parameters such as melting temperature,vacuum degree,refining temperature,refining time,casting temperature,cooling method and time etc.effect on the uniformity of component composition,inclusion defects,appearance quality of 30Mo-70 Ni alloy ingot and the compositional uniformity of the batch materials,size,appearance quality of the law of influence,optimize the production process of vacuum induction melting technology.Trial production of TA10 ingots was performed using the newly produced master alloy additive.Vacuum consumable arc furnace melting(VAR)and electron beam cooling hearth furnace(EB)were used for melting.The analysis results show that the ingot produced with the 30Mo-70 Ni alloy additive meets the requirements of the standard.The standard deviation of Mo and Ni content in the head of the vacuumconsumable arc furnace smelting ingot is reduced by 21% and 36% compared with the ingot produced by adding the original intermediate alloy.By comparing the cost of ingots produced by adding two intermediate alloys,the results show that the cost of adding 30Mo-70 Ni alloy additives is reduced by about 5%.The 30Mo-70 Ni intermediate alloy developed in this experiment has uniform composition and feasible process,and meets the requirements of intermediate alloy for TA10 titanium alloy,which can effectively reduce the cost of ingot and improve product quality,and has positive significance for improving product competitiveness and sustainable development.