A novel diffusion model considering curvature radius at the bonding interface in a titanium/steel explosive clad plate
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第9期
论文作者：Hai-tao Jiang Qiang Kang
文章页码：956 - 965
摘 要：This article introduces an element diffusion behavior model for a titanium/steel explosive clad plate characterized by a typical curved interface during the heat-treatment process. A series of heat-treatment experiments were conducted in the temperature range from 750°C to 950°C, and the effects of heat-treatment parameters on the microstructural evolution and diffusion behavior were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction analysis, and electron-probe microanalysis. Carbon atoms within the steel matrix were observed to diffuse toward the titanium matrix and to aggregate at the bonding interface at 850°C or lower; in contrast, when the temperature exceeded 850°C, the mutual diffusion of Ti and Fe occurred, along with the diffusion of C atoms, resulting in the formation of Ti–Fe intermetallics（Fe2Ti/FeTi）. The diffusion distances of C, Ti, and Fe atoms increased with increasing heating temperature and/or holding time. On the basis of this diffusion behavior, a novel diffusion model was proposed. This model considers the effects of various factors, including the curvature radius of the curved interface, the diffusion coefficient, the heating temperature, and the holding time. The experimental results show good agreement with the calculated values. The proposed model could clearly provide a general prediction of the elements’ diffusion at both straight and curved interfaces.
Hai-tao Jiang1，Qiang Kang1
1. National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing
摘 要：This article introduces an element diffusion behavior model for a titanium/steel explosive clad plate characterized by a typical curved interface during the heat-treatment process. A series of heat-treatment experiments were conducted in the temperature range from 750°C to 950°C, and the effects of heat-treatment parameters on the microstructural evolution and diffusion behavior were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction analysis, and electron-probe microanalysis. Carbon atoms within the steel matrix were observed to diffuse toward the titanium matrix and to aggregate at the bonding interface at 850°C or lower; in contrast, when the temperature exceeded 850°C, the mutual diffusion of Ti and Fe occurred, along with the diffusion of C atoms, resulting in the formation of Ti–Fe intermetallics（Fe2Ti/FeTi）. The diffusion distances of C, Ti, and Fe atoms increased with increasing heating temperature and/or holding time. On the basis of this diffusion behavior, a novel diffusion model was proposed. This model considers the effects of various factors, including the curvature radius of the curved interface, the diffusion coefficient, the heating temperature, and the holding time. The experimental results show good agreement with the calculated values. The proposed model could clearly provide a general prediction of the elements’ diffusion at both straight and curved interfaces.
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