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Volume 29 Issue 4
Sep.  2013
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Citation:
shu

Analysis on the variation principle of thermal cycle and stress in the laser overlapping area

  • 1.

    Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing 100022, China;

  • 2.

    Mechanical Department, Tangshan Institute, Tangshan 063000, China;

  • 3.

    BOE Corporation, Beijing 100016, China

  • Received Date: 2004-05-21
    Accepted Date: 2004-08-13
  • It is unavoidable that the hardness in the laser scanning area is not uniform due to the laser overlapping.Furthermore,the crack is apt to appear in the overlapping area.Firstly,the varying principles of the thermal cycle and stress during the laser scanning can be explained through the numerical methods.As a result,the theoretical explanations of the formation of the tempering and second quenching area are shown.The simulation results indicate that different overlapping parameters have little influence on the temperature varying principles.On the other hand,the parameters should not set too large in order to reduce the ununiformity of the hardness and crack in the area.
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  • [1] 刘怀喜,张三川.综合工艺参数对常用钢铁材料的激光淬火特性的影响 [J].激光杂志,2001,22(1):33～34.
    [2] 史晓强,王大承.激光相变硬化处理的模拟 [J].应用激光,2001,21(3):172～174.
    [3]

    GARNOV S V,KONOV V I.Experimental study of temperature de-pendence of reflectivity and heat capacity of steels and alloys at continuous wave Nd∶YAG laser heating [J].SPIE,1996,3093:160～175.
    [4] 李俊昌.激光热处理优化控制研究 [M].北京:冶金工业出版社,1995.130～186.
    [5]

    BOHOTA A,ISKIERKA S.Numerical prediction of the hardened zone in laser treatment of carbon steel [J].Acta Mater,1996,44(2):445～450.
    [6]

    TEIXEIRA V,ANDRITSCHKY M.Analysis of residual stresses in thermal barrier coatings [J].Journal of Materials Processing Technology,1999,92(93):209～216.
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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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Analysis on the variation principle of thermal cycle and stress in the laser overlapping area

  • 1. Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing 100022, China;
  • 2. Mechanical Department, Tangshan Institute, Tangshan 063000, China;
  • 3. BOE Corporation, Beijing 100016, China
  • Received Date: 2004-05-21
  • Accepted Date: 2004-08-13
  • Available Online: 2005-07-25

Abstract: It is unavoidable that the hardness in the laser scanning area is not uniform due to the laser overlapping.Furthermore,the crack is apt to appear in the overlapping area.Firstly,the varying principles of the thermal cycle and stress during the laser scanning can be explained through the numerical methods.As a result,the theoretical explanations of the formation of the tempering and second quenching area are shown.The simulation results indicate that different overlapping parameters have little influence on the temperature varying principles.On the other hand,the parameters should not set too large in order to reduce the ununiformity of the hardness and crack in the area.

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