The application of rational approximation in the calculation of a temperature field with a non-linear surface heat-transfer coefficient during quenching for 42CrMo steel cylinder |
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Authors: | Heming Cheng Xieqing Huang Jiang Fan Honggang Wang |
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Affiliation: | (1) Department of Architectural Engineering and Mechanics, Kunming University of Science and Technology, 650093 Kunming, P.R. China;(2) School of Mechanical Engineering, Xian Jiao Tong University, 790041 Xian, P.R. China |
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Abstract: | The calculation of a temperature field has a great influence upon the analysis of thermal stresses and stains during quenching.
In this paper, a 42CrMo steel cylinder was used an example for investigation. From the TTT diagram of the 42CrMo steel, the
CCT diagram was simulated by mathematical transformation, and the volume fraction of phase constituents was calculated. The
thermal physical properties were treated as functions of temperature and the volume fraction of phase constituents. The rational
approximation was applied to the finite element method. The temperature field with phase transformation and non-linear surface
heat-transfer coefficients was calculated using this technique, which can effectively avoid oscillationin the numerical solution
for a small time step. The experimental results of the temperature field calculation coincide with the numerical solutions. |
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Keywords: | finite element method quenching rational approximation phase transformation temperature field |
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