Formulation of rod-forming models and their application in spray forming |
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Authors: | Hyun-Kwang Seok Jae-Chul Lee Ho-In Lee Hui Choon Lee Kyu Hwan Oh Hyung Yong Ra |
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Affiliation: | (1) the Division of Metals, Korea Institute of Science and Technology, 136-791 Seoul, Korea;(2) Kangwon Ind. Ltd., 790-370 Kyung-Buk, Korea;(3) the School of Materials, Seoul National University, 151-742 Seoul, Korea |
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Abstract: | In rod spray forming, the preform changes its shape continually from that of a disc to a rod (transient-state rod growth)
and then maintains its top surface profile once it has settled down (steady-state rod growth). The rod growth mechanism during
spray forming was analyzed using rod-forming models. At a sufficiently high substrate rotation velocity, the calculated results
based on the three-dimensional time-dependent model (3-D TDM) and the two-dimensional time-dependent model (2-D TDM) were
observed to be identical. The calculated results of the rod’s top shape, obtained by the TDMs, were almost identical to those
obtained by the two-dimensional time-independent model (2-D TIM), which means that there exists steady-state rod growth. The
effects of spray-forming parameters, such as initial eccentric distance, substrate withdrawal velocity, and spray angle, on
the shape-evolution behavior were analyzed in terms of the vertex growth velocity (
). The optimum spray-forming condition to minimize transient-state rod growth was also presented. Experimental verification
was made to confirm the proposed forming models. |
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