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Hot forging of Al MMC for automotive applications
Kevorkijan, Varužan ; Smolar, T.
In this work, a production procedure already practised on an industrial scale for the forging of aluminium alloys was applied for the closed-die hot forging of Al MMC Al-6061/▫$Al_2O_3$▫/10p ...(supplier: Duralcan Co., USA). The production line consists mainly of a cutting, a forging, a hot trimming, and a heat treatment area. The effectiveness of the production line was demonstrated by producing 1160 samples of connecting rods. The temperature of the forged bars was 500[plus minus]10°C, the upper and lower temperatures of the forging die were about 325°C and 320°C, respectively. The forging operation was applied on the screw press with a capacity of 10 MN in order to achieve higher productivity. The forging trial performed demonstrated on an industrial scale that Al MMC, consisting of equiaxial particulate reinforcement having an average particle size of less than 10 [mu]m, can be hot forged under a strain rate of 3 s[sup]-1 without damage to the ceramic phase and the generation of other microstructural failures. Dimensional inspection of the forging confirmed that the tolerances specified in DIN 1749 were achieved with absolute certainty.
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