Trapping and diffusion of hydrogen in steel, 강철 내에서의 수소 트랩핑과 확산
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Trapping and diffusion of hydrogen in steel, 강철 내에서의 수소 트랩핑과 확산강철에서 발생하는 수소 트랩핑 현상을 분석한다. 여러가지 공학적 수소 트랩핑 방법을 소개하고, 트랭핑된 수소가 강철내에서 확산되는 이론을 분석한다.
목차
1. Introduction2. Analysis of hydrogen trapping
2.1. Solid solubility at low temperatures
2.2. Hydrogen Thermal Desorption Analysis (TDA)
2.2.1. Dissociation-controlled desorption
2.2.2. Diffusion-controlled desorption
2.3. Equilibrium distribution
2.4. Kinetics of hydrogen trapping
3. Diffusion of hydrogen
3.1. Determination of diffusion coefficient
3.2. Diffusion process
Reference
본문내용
1. IntroductionAs shown in Figure 1, various processes can occur during and after the introduction of hydrogen in a solid. Thermal hydrogen can be adsorbed onto the surface with subsequent dissociation and diffusion into the bulk. Hydrogen introduced into the first wall will tend to diffuse both into the bulk and to the surface. At the surface, it can recombine to form H2 molecules and desorb. It is established that the passage of hydrogen is hindered by lattice imperfections which tend to attract and bind it; this phenomenon is known as trapping.
Figure 1 Schematic of hydrogen effects in solids
2. Analysis of hydrogen trapping
Hydrogen trapping in steel occurs in radiation damage sites (e.g., vacancies, interstitial loops, etc.), in voids, in highly strained regions around crack tips, in grain boundaries, and at impurities. Trapping sites for hydrogen can be characterized by a trap concentration and a trap binding energy.
참고 자료
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