Analysis of transient heat conduction with phase change in a spray deposited body

Dong Hoon Chang, Shinill Kang, Eon Sik Lee, Sangho Ahn

Research output: Contribution to conferencePaperpeer-review

2 Citations (Scopus)

Abstract

A numerical method is presented to predict and analyze the shape and the temperature history of a growing billet produced from the `spray forming' which is a fairly new near net-shape manufacturing process. It is important to understand the mechanism of billet growing and the cooling history of the spray deposited body, because one can obtain a billet with the desired final shape without secondary operations by accurate control of the billet shape and, moreover, growing velocity together with the cooling rate define the microstructure of the final formed product. The shape of a growing billet is determined by the flow rate of the alloy melt, the mode of nozzle scanning which is due to cam profile, the initial position of the spray nozzle, scanning angle, and the withdrawal speed of the substrate. The temperature history of a growing billet is governed by the heat flux input from the spray, gas convection on the surface of the deposited body, and heat conduction to the substrate. In the present study, a theoretical model is first established to predict the shape of the billet and next the transient axisymmetric heat conduction problem with growing domain is solved using the so called `deforming finite element technique'. The range of mushy zone near the surface of the deposited body is predicted, and the effect of cooling history on the microstructure and possible pore developments are discussed.

Original languageEnglish
Pages497-508
Number of pages12
Publication statusPublished - 1998
EventProceedings of the 1998 TMS Annual Meeting - San Antonio, TX, USA
Duration: 1998 Feb 151998 Feb 19

Other

OtherProceedings of the 1998 TMS Annual Meeting
CitySan Antonio, TX, USA
Period98/2/1598/2/19

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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