Seok, HK Lee, HC Oh, KH Lee, JC Lee, HI Ra, HY 2024-01-21T14:07:36Z 2024-01-21T14:07:36Z 2021-09-05 2000-05 1073-5623 https://pubs.kist.re.kr/handle/201004/141428 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 (G(0)(nu)). The optimum spray-forming condition to minimize transient-state rod growth was also presented. Experimental verification was made to confirm the proposed forming models. English MINERALS METALS MATERIALS SOC HEAT-TRANSFER THERMAL HISTORIES SOLIDIFICATION DROPLETS MICROSTRUCTURE DEPOSITION BILLETS Formulation of rod-forming models and their application in spray forming Article 10.1007/s11661-000-0266-0 1 METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v.31, no.5, pp.1479 - 1488 METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 31 5 1479 1488 scie scopus 000087110800016 2-s2.0-0034187790 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science Metallurgy & Metallurgical Engineering Article HEAT-TRANSFER THERMAL HISTORIES SOLIDIFICATION DROPLETS MICROSTRUCTURE DEPOSITION BILLETS rod-forming model spray forming transient growth steady growth time-dependent model time-independent model