| The effects of heat treatment on the structure of high Silicon-Al alloys were examined by metallography. The effects of heat treatment on the surface roughness, the chip formation and the amount of build up edge, after cutting at various cutting speeds and cutting depths were studied. The results obtained are as follows; 1. The heat treatment of the high silicon-aluminum alloy changed eutectic silicon crystal into spheroidal form, the quality of material was intensified and the mechanical properties were improved conspicuously. 2. When feeding speed was constant, the surface roughness was inversely proportional to the square of cutting speed, and heat treatment decreased its ratio greatly. 3. The refining treatment diminished the amount of adhesion to tool surface, and the heat treatment deminished its amount more. 4. When feeding speed was constant, the surface roughness was proportional to cutting depth, and its ratio was much decreased by heat treatment. 5. The illumination of machined surface was improved by heat treatment, especially by heat treatment followed by refining-treatment with Mg. Spheroidizer. |
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