A non-steady method of the mixed Lagrangian and Eulerian（MiLE）method was used to simulate the continuous casting process of the large scale titanium slab ingot

focusing on influence of different ingot cross section dimensions

pouring temperature and pulling speed on the titanium ingot solidliquid interface morphology

the molten pool depth and the length of non-steady transition zone.The results show that with the ingot cross section length increasing from 200 mm to 1 200 mm

the depth of molten pool is increased to a constant value of 77 mm

while solid fraction is decreased gradually with the increasing cross section length at Ti ingot width of 200 mm.The solid-liquid interface depth of melting ingot is decreased

while solid fraction is increased gradually with increasing in cross section width at the constant ingot cross section area.The effective distance of crystallizer heat dissipation is the critical value to determine whether solid-liquid interface morphology of the titanium ingot is affected by the cross section thickness.In addition

with increasing in pouring temperature and drawing velocity

nonsteady transition zone length is increased linearly.Compared to pouring temperature

drawing velocity exhibits the major role in affecting transition zone length.