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RESEARCH PAPERS

Thermal Modeling of Deposit Solidification in Uniform Droplet Spray Forming

[+] Author and Article Information
P. Acquaviva, Chen-An Chen, Jung-Hoon Chun

Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge. MA

Teiichi Ando

Department of Mechanical Engineering, Tufts University, Medford, MA

J. Manuf. Sci. Eng 119(3), 332-340 (Aug 01, 1997) (9 pages) doi:10.1115/1.2831111 History: Received June 01, 1995; Revised November 01, 1995; Online January 17, 2008

Abstract

In spray forming, the deposit thermal state is a key parameter which influences the microstructural evolution upon and after droplet impact onto the deposit. The uniform droplet spray (UDS) forming process has been developed to enable precise control of the droplet and deposit thermal state and the resultant material microstructure. By having a uniform droplet size throughout the spray, all the droplets deposited onto the substrate will have the same thermal state upon impact, allowing for precise control of the solidification process. This paper describes a one-dimensional, finite difference model that predicts the temperature and liquid fraction of the deposit during the UDS process. The model employs an explicit temperature-enthalpy method to incorporate a variety of solidification models. Experiments were conducted using Sn-15 wt percent Pb binary alloy. Temperatures were measured in the deposit and acceptable agreement with the simulation was obtained. Modeling has shown that the deposit thermal state is highly dependent on variations in spray conditions, which are predicted using droplet trajectory and droplet thermal models. Using the droplet and deposit models, the relationship between UDS process parameters and material microstructure can be understood.

Copyright © 1997 by The American Society of Mechanical Engineers
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