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Optimal heat transfer coefficient distribution of H-beam in controlled cooling process

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Document pages: 15 pages

Abstract: A three-dimensional thermal model for predicting the heat transfer coefficient distribution of beams with different sizes is studied. For H300 × 300、H250 × 250 and H200 × The design requirements of maximum uniform temperature distribution and minimum residual stress after controlled cooling are obtained. Conjugate gradient method is used to optimize the distribution of heat transfer coefficient. The numerical results show that the heat transfer coefficient obtained by the conjugate gradient method can produce a more uniform temperature field under the same model and the same initial temperature (° C) and final temperature (° C)e distribution and smaller residual web stress, with objective functions of the final average temperature and maximum temperature difference to minimum . The maximum temperature difference is decreased by 57°C, 74°C, and 75°C for Case  1, Case  2, and Case  3, respectively, the surface maximum temperature difference is decreased by 60~80°C for three cases, and the residual stress at the web can be reduced by 20~40 MPa for three cases.

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