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Induction heating is a form of non-contact heating for conductive materials, when alternating current flows in the induced coil, varying electromagnetic field is set up around the coil, circulating current(induced, current, eddy current) is generated in the workpiece(conductive material), heat is produced as the eddy current flows against the resitivity of the material.
Induction heating is a rapid ,clean, non-polluting heating form which can be used to heat metals or change the conductive material’s properties. The coil itself does not get hot and the heating effect is under controlled. The solid state transistor technology has made induction heating much easier,cost-effective heating for applications including soldering and induction brazing ,induction heat treating, induction melting,induction forging etc.<
CHROMIZING OF STEEL BY HIGH-FREQUENCY INDUCTION HEATING
A drawback in the diffusion induction heating metallizing of alloys by various elements is the considerable lengthiness of the process, which can be accelerated only by increasing the temperature. This, however, considerably impairs the properties of the metal base, and also reduces the durability of the furnace equipment at high temperatures. The thermochemical treatment of the alloy may be accelerated by using induction heating, thereby ensuring a high temperature in the surface layer. In a number of investigations, diffusion saturation using trowelled-on pastes and powder packs by high-frequency induction heating has been tried [1, 4,6, "7, 8]. Diffusion coating of steel by metal from a gaseous medium has been found possible [2, 3, 5]. ~y the uSe of highfrequency induction heating, the duration of the process is shortened, compared with the use of external sources of heat. This article describe the investigation of the chromizing of steel by high-frequency induction heating in a vacuum. The chromizing mixtUre used was a low-carbon ferro chrome mark KhrO and electrolytic chromium. Steels 10 and U8 were used for saturation.