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Measurement of the mass transfer coefficient at workpiece surfaces in heat treatment furnaces
Authors:Weimin Gao  Lingxue Kong  John M Long  Peter D Hodgson
Affiliation:1. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, People''s Republic of China;2. Materials Research and Education Center, Auburn University, AL 36849, USA;3. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, People''s Republic of China;1. Key Laboratory of Material Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China;2. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China;1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710049, PR China;2. Materials Research Deperartment, Xi’an Thermal Power Research Institute Co., Ltd., PR China;1. Machine Design Section, Indian Institute of Technology Madras, Chennai 600036, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India;1. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;2. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Abstract:The mass (e.g. carbon) transfer coefficient at a workpiece surface is an important kinetic factor to control the heat treatment process of the workpiece and to evaluate heat treatment equipment. The coefficient can be calculated from the carbon concentration at the surface of a sample carburized in a carburizing furnace for a given time. Two common measurement methods which use a thin plate and employ a component as samples respectively are evaluated and compared for sensitivity and uncertainty. The comparison shows that the use of a component produces higher measurement precision and also has the advantage in measuring the carbon transfer coefficients at different treated positions. This method is then extended and discussed methodologically. Also two equations are proposed to calculate the carbon transfer coefficient and its uncertainty, respectively. This method is also applied to measure the carbon transfer coefficient in a fluidized bed heat treatment furnace.
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