Abstract
The technology of semi-solid forging (SSF) has been actively developed to fabricate near-net-shape products using light and difficult to form materials. Generally, the SSF process is composed of slug heating, forming, compression holding and an ejecting step. After the forming step in SSF, the slug is compressed during a certain holding time in order to completely fill the die cavity and to accelerate the solidification rate. The compression holding time that can affect microstructural characteristics, mechanical properties and the shape of products is important. This paper presents a procedure to predict the compression holding time for obtaining the final shape of the product. Information is preheated temperature and the solid fraction for a cylindrical slug in the compression holding step of a closed-die compression process using heat transfer analysis and considering latent heat, by means of the finite element method. The influence of the predicted compression holding time on microstructural characteristics, mechanical properties and shape of the product is investigated by experiment.
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