TY - JOUR

T1 - Optimal Heat Transfer Coefficient Distributions during the Controlled Cooling Process of an H-Shape Steel Beam

AU - Gan, Yu Feng

AU - Jang, Jiin Yuh

N1 - Funding Information:
This research was financially supported by the Ministry of Science and Technology and China Steel Corporation, Taiwan, under Contract no. MOST103-2622-E006-037. The authors are also grateful to Dr. Chao-Hua Wang of China Steel Corporation, Taiwan, for his valuable suggestions.

PY - 2017

Y1 - 2017

N2 - Three-dimensional thermal-mechanical models for the prediction of heat transfer coefficient distributions with different size beams are investigated. H300 × 300, H250 × 250, and H200 × 200 H-shape steel beams are investigated in a controlled cooling process to obtain the design requirements for maximum uniform temperature distributions and minimal residual stress after controlled cooling. An algorithm developed with the conjugated-gradient method is used to optimize the heat transfer coefficient distribution. In a comparison with the three group results, the numerical results indicate that, with the same model and under the same initial temperature (T=850°C) and final temperature (T=550±10°C), the heat transfer coefficients obtained with the conjugated-gradient method can produce more uniform temperature distribution and smaller residual web stress, with objective functions of the final average temperature Tave±ΔT and maximum temperature difference to minimum minδTmax(x,y). 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 6080°C for three cases, and the residual stress at the web can be reduced by 2040 MPa for three cases.

AB - Three-dimensional thermal-mechanical models for the prediction of heat transfer coefficient distributions with different size beams are investigated. H300 × 300, H250 × 250, and H200 × 200 H-shape steel beams are investigated in a controlled cooling process to obtain the design requirements for maximum uniform temperature distributions and minimal residual stress after controlled cooling. An algorithm developed with the conjugated-gradient method is used to optimize the heat transfer coefficient distribution. In a comparison with the three group results, the numerical results indicate that, with the same model and under the same initial temperature (T=850°C) and final temperature (T=550±10°C), the heat transfer coefficients obtained with the conjugated-gradient method can produce more uniform temperature distribution and smaller residual web stress, with objective functions of the final average temperature Tave±ΔT and maximum temperature difference to minimum minδTmax(x,y). 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 6080°C for three cases, and the residual stress at the web can be reduced by 2040 MPa for three cases.

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U2 - 10.1155/2017/9873283

DO - 10.1155/2017/9873283

M3 - Article

AN - SCOPUS:85031896682

VL - 2017

JO - Advances in Materials Science and Engineering

JF - Advances in Materials Science and Engineering

SN - 1687-8434

M1 - 9873283

ER -