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Non-Fourier Heat Conduction Effects During High-Energy Beam Metalworking
作者姓名:张海泉  张彦华  赵海燕
作者单位:[1]DepartmentofMechanicalEngineering,TsinghuaUniversity,Beijing100084,China [2]DepartmentofMaterialsProcessingandControlEngineering,BeihangUniversity,Beijing100083,China
基金项目:Supported by the National Defense Science Foundation of China and the Special Fund of Colleges and Universities for Doctoral Study
摘    要:Non-Fourier heat conduction induced by ultrafast heating of metals with a high-energy density beam was analyzed. The non-Fourier effects during high heat flux heating were illustrated by comparing the transient temperature response to different heat flux and material relaxation times. Based on the hyperbolic heat conduction equation for the non-Fourier heat conduction law, the equation was solved using a hybridmethod co mbining an analytical solution and numerical inversion of the Laplace transforms for a semiinfinite body with the heat flux boundary. Analysis of the temperature response and distribution led to a criterion for the applicability of the non-Fourier heat conduction law. The results show that at a relatively large heat flux, such as greater than 108 W/cm2, the heat-affected zone in the metal material experiences a strong thermal shock as the non-Fourier effects cause a large step increase in the surface temperature. The results provide a method for analyzing transient heat conduction problems using a high-energy density beam, such as electron beam deep penetration welding.

关 键 词:非傅立叶热传导  高能密度束  金属加工  超速热处理  电子束

Non-Fourier Heat Conduction Effects During High-Energy Beam Metalworking
ZHANG Haiquan ,ZHANG Yanhua,ZHAO Haiyan.Non-Fourier Heat Conduction Effects During High-Energy Beam Metalworking[J].Tsinghua Science and Technology,2004,9(5):596-600.
Authors:ZHANG Haiquan  ZHANG Yanhua  ZHAO Haiyan
Institution:ZHANG Haiquan
Abstract:Non-Fourier heat conduction induced by ultrafast heating of metals with a high-energy density beam was analyzed. The non-Fourier effects during high heat flux heating were illustrated by comparing the transient temperature response to different heat flux and material relaxation times. Based on the hyperbolic heat conduction equation for the non-Fourier heat conduction law, the equation was solved using a hybrid method combining an analytical solution and numerical inversion of the Laplace transforms for a semi- infinite body with the heat flux boundary. Analysis of the temperature response and distribution led to a crite- rion for the applicability of the non-Fourier heat conduction law. The results show that at a relatively large heat flux, such as greater than 108 W/cm2, the heat-affected zone in the metal material experiences a strong thermal shock as the non-Fourier effects cause a large step increase in the surface temperature. The results provide a method for analyzing transient heat conduction problems using a high-energy density beam, such as electron beam deep penetration welding.
Keywords:non-Fourier effects  high-energy density beam  ultrafast transient heat conduction
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