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Title:: Numerical Simulation of the VAR Process of Ti_1023 Alloy Ingot with Melt Flow VAR and Validation

Author(s):: ZHAO Xiaohua; HE Yongsheng; LUO Wenzhong; LAI Yunjin; WANG Kaixuan; LIU Xianghong; Western Superconducting Technologies Co, Ltd, Shaanxi Province Engineering Laboratory for Aerial Material，Xi’an 710018, China

Keywords:: Ti_1023 alloy; Melt Flow VAR; molten pool shape; element distribution; validation

Abstract:: Owing to the excellent physical and mechanical properties, Ti1023 alloy has been used widely in large structure parts. Nowadays Ti1023 ingot is produced by vacuum arc remelting（VAR) process, which may cause the β freckles due to this alloys high Fe content. So the β freckles can affect forgings properties. In this work, the shape of molten pool and the element distribution of the Ti1023 ignot at different stage during the VAR process have been simulated by Melt FlowVAR. In order to validate the agreement between the model and experiment results, a fullscale Ti1023 ingot has been prepared. The results show that the shape of molten pool changed from bowl shape in the initial stage to Vshape in the medium stage, and then to deep Vshape in the last stage during the melting process. The final depth of the molten pool is about 028 m, which is in good agreement with the experimental result. In the top and bottom part of the ingot, the simulated results of the distribution of Fe and Al are in good agreement with the measured results. However, there is a big deviation between the measured and modeled results for the distribution of Fe and Al in the middle part of the ingot, which should be attributed to the computing deviation of isometric crystals sedimentation in this model.