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Analysis of Undercooling, Nucleation, Rapid Solidification, and Microstructure Formation in Thermal Spraying

[+] Author Affiliations
H. Zhang, X. Y. Wang, S. Sampath

State University of New York at Stony Brook, Stony Brook, NY

Paper No. IMECE2002-32907, pp. 255-267; 13 pages
doi:10.1115/IMECE2002-32907
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 5
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3636-3 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

A splat formation model including undercooling, nucleation, and non-equilibrium solidification has been developed to study the thermal characteristics of molten droplets impacting on a flat substrate. The nucleation sub-model is based on the classic nucleation theory accounting for heterogeneous nucleation kinetic and crystal growth. The effects of contact angle on nucleation temperature and grain density have been investigated. The grain size distributions have been predicted and compared with experimental results for molybdenum (Mo) splats on different substrates. Based on scaling analysis, time scales of various sub-processes, e.g., the nucleation delay, recalesence, and total solidification time, have been derived, and compared with simulation results.

Copyright © 2002 by ASME

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