Numerical Simulation of Thermal Stress Field of Steel Ingot in Solidification Process
The temperature and thermal stress field of 13t ingot and mould were simulated and studied by three-dimensional transient FEM, the laws of thermal stress distribution in mould and ingot during solidification were discussed. The results show that at initial stage of solidification, the compressive stress and tensile stress is located at internal surface and outside ones of mould respectively, the tensile stress is located at outside surface of ingot due to solidification contraction, and the value of thermal stress in the mould decreases gradually with the incnease of solidification time. At the end of solidification, the tensile stress lies at core of ingot; the compressive stress lies at outside surface of ingot. During the solidification, the maximum and minimum shrinkages are located at fillet and opposite arc of ingot outside surface, respectively. This conclusion may provide basis for the optimizing design of mould and improvement of the ingot quality.