Effect Of Processing Parameters On The Shape Of Molten Pool And The Length Of Unsteady Transition Zone In Titanium Slag Solidification

The excellent performance of titanium has brought wonderful development perspectives, such as aerospace, defense industry and other industries. Titanium industry is becoming the key industry in our country, so we enhance the production capacity and processing ability of titanium. Using electron beam cold hearth melting furnace to form large titanium ingot is the main way to fabricate titanium material. In order to get high quality titanium flat ingot, knowing the process of melting and solidification is very important.In this paper, we study the numerical simulation of temperature field coupling stress field, during the semi-continuous solidification process of large-sized titanium ingot. We find the influence of different process conditions was more obvious in the production process. The finite element software ProCAST is used to simulate temperature field and stress field of large-size flat titanium ingot. This paper focus on the effects of pouring temperature and different ingot pulling speed on large-sized flat titanium ingot solidification process.Titanium ingot solid-liquid interface morphology under the continuous casting solidification has an important influence on the micro-structure formation. This paper mainly studied the effect of pulling speed and casting temperature on the solid-liquid interface of titanium ingot. The finite element method is used to simulate continuous casting solidification process of large-sized titanium ingot in the electron beam cold hearth melting furnace. Effect of casting temperature and pulling speed on the solidification interface morphology and solid fraction has been obtained when solidification of the titanium alloy is at the steady state based on calculated temperature field.In the process of large-sized ingot of titanium semi-continuous casting, solid fraction and the shape of molten pool have an important impact on forming high quality titanium ingot. Based on the finite element method and using numerical simulation method, we will carry out the unsteady numerical calculation of large-sized titanium ingot during the solidification process. The simulation results show that:solid fraction and length of the region in which the molten pool morphology is changing obviously will decrease linearly with the casting temperature and pulling speed increasing, while the depth of molten pool and the depth of 1/4 of molten pool will increase linearly. Compared with the casting temperature, the influence from the pulling speed is more obviously to the solid fraction.According to the stress field numerical simulation of large-sized titanium ingot, we find that:at the initial stage of solidification, the surface stress and internal stress increase significantly with time; the force on both sides of titanium ingot and the top of titanium ingot also increase significantly with time. The effective force on both sides increase then gradually level off. At the same time, both sides of the titanium ingot and the spindle head are deformed, and the deformation of the two sides of the titanium ingot is obvious.