발간논문

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Vol.36, No.6, 973 ~ 981, 1998
Title
Optimization of Initial Process Parameter in Spray Forming (1) -Control of the Initial Melt Temperature
이재철 Jae Chul Lee , 석현광 Hyun Kwang Seok , 신돈수 Don Soo Shin , 이호인 Ho In Lee
Abstract
Effect of the initial melt temperature on the microstructure of the sprayformed 2014 Al billet was studied with particular emphasis on the effect of superheating on the liquid fraction(FL) in the sprayed droplets. In order to determine the average liquid fraction within the sprayed droplets, the cooling rate and the flight time of droplets were calculated. The measured cooling rate of droplets was in the vicinity of ~104℃/sec and the flight time before impinging the preform ranges from 6 to 9 msec depending on the size of droplets. The obtained results from the experiments were in good agrement with those of theoretical models by P. Grant et al. and/or Lee et al. The liquid fraction of droplets did not vary significantly with the initial melt temperature such that FL was calculated to be 24% when Ti = 800℃ while FL = 19.5% when Ti = 720℃, resulting in considerable amount of porosity within the preform. Such a result indicates that the initial melt temperature control may not be effective for fabricating preforms with a minimal amount of porosity.
Key Words
Spayforming, Aluminum alloy, Cooling rate, Solid fraction
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