A Kinetic Approach to Hydrogen Diffusion through Steel at 100–350°C

F. R. Coe, J. Moreton
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引用次数: 6

Abstract

AbstractClassical reaction kinetics has been employed to describe the movement of hydrogen in ferritic steels in the range 100–350° C. Predictions based on theory are supported by the results of experiments on three materials. The two processes of lattice diffusion of hydrogen and the release of hydrogen from traps in the metal are combined as consecutive reactions, the former being the rate-controlling step at high temperatures and the latter at low temperatures. In the intermediate region where neither process is predominant, there will be a gradual transition from one mode of reaction to another. Values for both the true lattice and the overall diffusivity coefficients are calculated in the intermediate-temperature region. It is shown that a practical implication of this theory is that it is necessary to select higher temperatures or longer times for post-heat-treatments for wrought steels and weldments in the intermediate-temperature region than had previously been anticipated.
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100-350℃下氢在钢中的扩散动力学研究
摘要用经典反应动力学方法描述了氢在铁素体钢中100 ~ 350℃范围内的运动,理论预测得到三种材料实验结果的支持。将氢的晶格扩散和氢从金属中的捕集器中释放两个过程结合为连续反应,前者在高温下为控速步骤,后者在低温下为控速步骤。在两种反应都不占优势的中间区域,将会有从一种反应模式向另一种反应模式的逐渐过渡。在中温区计算了真晶格和总扩散系数的值。结果表明,这一理论的实际含义是,有必要选择比先前预期的更高的温度或更长的时间对锻造钢和焊接件在中温区域进行后热处理。
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Superconducting Materials Research Influence of Anodic Layers on Fatigue-Crack Initiation in Aluminium Precipitation Processes in Mg–Th, Mg–Th–Mn, Mg–Mn, and Mg–Zr Alloys Precipitation in Aluminium-Copper Alloys Containing Additions of Indium and Tin A Kinetic Approach to Hydrogen Diffusion through Steel at 100–350°C
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