Abstract
Induction heating finds applications in metal manufacturing processes where high energy efficiency and short heating time are required. Since heat is directly induced within a workpiece by circulating eddy currents and hysteresis, the high energy efficiency of induction heating would be obtained with high resistivity and magnetic materials. In this work, influence of initial microstructure on induction heating of A319 aluminium alloy was investigated in order to understand the induction heating phenomenon of non-magnetic materials. Billets with dendritic and globular grain structure were heated to different temperatures in a simple helical wound coil using an induction furnace. Heat induced in the billets was measured using a calorimetry method. Noticeably higher heat content was found in the dendritic grain structure billets with all investigated induction heating temperatures. Possible reasons of this difference in heating behavior of the differently initial microstructure billets were discussed
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