中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 27 No. 11 November 2017 |
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha 410083, China; 3. Light Alloy Research Institute, Central South University, Changsha 410083, China）
Abstract:Stepped heating treatment has been applied to aluminum alloy thick plate to improve the mechanical performance and corrosion resistance. Accurate temperature control of the plate is the difficulty in engineering application. The heating process, the calculation of surface heat transfer coefficient and the accurate temperature control method were studied based on measured heating temperature for the large-size thick plate. The results show that, the temperature difference between the surface and center of the thick plate is small. Based on the temperature uniformity, the surface heat transfer coefficient was calculated, and it is constant below 300 °C, but grows greatly over 300 °C. Consequently, a lumped parameter method (LPM) was developed to predict the plate temperature. A stepped solution treatment was designed by using LPM, and verified by finite element method (FEM) and experiments. Temperature curves calculated by LPM and FEM agree well with the experimental data, and the LPM is more convenient in engineering application.
Key words: lumped parameter method; surface heat transfer coefficient; temperature field; aluminum alloy; thick plate
