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Volume 25 Issue 1
Sep.  2013
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Citation:
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A numerical simulation for solidification process of laser pool for composite coating system

  • 1.

    Department of Physics, Capital Normal University, Beijing, 100037;

  • 2.

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong;

  • 3.

    Tsinghua Univ ersity, Beijing, 100084

  • 4.

    School of Materials Science and Engineering, HUST, Wuhan, 430074

  • Received Date: 1999-08-30
    Accepted Date: 2000-06-06
  • In this paper, solidification process of laser pool for composite coating system is studied, using numerical technology. The results demonstrate that solidification process may be divided into two stages: quasi-state stage and accelerating stage. At quasi-state stage, the depth and radius of laser pool have small changes, but the highest surface temperature and velocity of molten pool decease rapidly. At the accelerating stage, those are on the contrary. Because of highly overheating in upper molten pool, post molten phenomenon is produced in down molten pool, during solidification quasi-state stage. The key factors to produce post molten region are the overheating and the latent heat released during solidification process in upper molten pool.
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  • [1] Zeng DW,Xie Ch Sh.Laser Technology(激光技术), 2000;24(6):370
    [2]

    Wang AH. Investigation into Laser Beam Cladding of Aluminum Alloy and Its Behavior in the Transitional Region. PH D Dissertation, Huazhong University of S cience and Technology, 1997: 40
    [3]

    Zeng D W,Xie Ch Sh,Sheng Y M.The Chinese Journal of Nonferrous Metals,2000 ;10(4):502～505
    [4]

    Kou S,Wang Y H.Metall Tans A, 1986;17A:2265
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    Basu B,Date A W.Int J Heat Mass Transfer,1988;31(11):2331
    [6]

    Rhie C M,Chow W L.AIAA J,1983;21:1525
    [7]

    Tao L H.Foundry Handbook.Beijing:Mechanical Industry Press,1993
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  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

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A numerical simulation for solidification process of laser pool for composite coating system

  • 1. Department of Physics, Capital Normal University, Beijing, 100037;
  • 2. Department of Physics and Materials Science, City University of Hong Kong, Hong Kong;
  • 3. Tsinghua Univ ersity, Beijing, 100084
  • 4. School of Materials Science and Engineering, HUST, Wuhan, 430074
  • Received Date: 1999-08-30
  • Accepted Date: 2000-06-06
  • Available Online: 2001-01-25

Abstract: In this paper, solidification process of laser pool for composite coating system is studied, using numerical technology. The results demonstrate that solidification process may be divided into two stages: quasi-state stage and accelerating stage. At quasi-state stage, the depth and radius of laser pool have small changes, but the highest surface temperature and velocity of molten pool decease rapidly. At the accelerating stage, those are on the contrary. Because of highly overheating in upper molten pool, post molten phenomenon is produced in down molten pool, during solidification quasi-state stage. The key factors to produce post molten region are the overheating and the latent heat released during solidification process in upper molten pool.

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