Quality and Properties Control of Semi-solid Forming Product and Primary Material

Processing parameters of slurry made by electro-magnetic stirring,processing methods and processing parameters of semi-solid forming which affect the quality of primary material for semi-solid forming and the properties of the product are generally analyzed.Three main processing parameters affecting primary material of semi-solid are stirring velocity,cooling rate of metal and stirring time.Increasing stirring velocity,upgrading cooling rate and decreasing stirring time properly will make the first phase grains smaller and the grains rosette-like.Semi-solid forming process are divided into the forming of slurry and the forming of billet.Compared with the forming of slurry,the forming of billet is fit to be produced in the form of specialization because it is manipulated and controlled easily,and is automotive.Furthermore the forming of slurry becomes an important development trend in future because it saves energy,shortens processing flow and makes equipments simple.In semi-solid processing the parameters affecting the microstructure and properties of the products are chiefly press,filling velocity,holding time and mould heated temperature.Increasing press,mould heated temperature,filling velocity and holding time can improve the interior microstructure dense,make the figure of the product clear and make its size accurate.