Trapping and diffusion of hydrogen in steel, 강철 내에서의 수소 트랩핑과 확산

소개글

Trapping and diffusion of hydrogen in steel, 강철 내에서의 수소 트랩핑과 확산
강철에서 발생하는 수소 트랩핑 현상을 분석한다. 여러가지 공학적 수소 트랩핑 방법을 소개하고, 트랭핑된 수소가 강철내에서 확산되는 이론을 분석한다.

목차

1. Introduction

2. 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. Introduction
As 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

Darken, L. S.; Smith, R. P., Behavior of Hydrogen in Steel During and After Immersion in Acid. Corrosion 1949, 5 (1), 1-16.
Langley, R. A., Hydrogen trapping, diffusion and recombination in austenitic stainless steels. Journal of Nuclear Materials 1984, 128, 622-628.
Redhead, P., Thermal desorption of gases. Vacuum 1962, 12 (4), 203-211.
Song, E. J. Hydrogen Desorption in Steels. Citeseer, 2015.
Kissinger, H. E., Reaction kinetics in differential thermal analysis. Analytical chemistry 1957, 29 (11), 1702-1706.
Oriani, R. A., The diffusion and trapping of hydrogen in steel. Acta metallurgica 1970, 18 (1), 147-157.
Hirth, J.; Carnahan, B., Hydrogen adsorption at dislocations and cracks in Fe. Acta Metallurgica 1978, 26 (12), 1795-1803.
McLellan, R. B., Thermodynamics and diffusion behavior of interstitial solute atoms in non-perfect solvent crystals. Acta Metallurgica 1979, 27 (10), 1655-1663.
Beshers, D., On the distribution of impurity atoms in the stress field of a dislocation. Acta Metallurgica 1958, 6 (8), 521-523.
McNabb, A.; Foster, P., A new analysis of the diffusion of hydrogen in iron and ferritic steels. Trans. Metall. Soc. AIME 1963, 227 (3), 618-627.
Turnbull, A.; Hutchings, R.; Ferriss, D., Modelling of thermal desorption of hydrogen from metals. Materials Science and Engineering: A 1997, 238 (2), 317-328.
Nagumo, M., Fundamentals of hydrogen embrittlement. Springer: 2016.
Choo, W.; Lee, J. Y., Thermal analysis of trapped hydrogen in pure iron. Metallurgical Transactions A 1982, 13 (1), 135-140.
Boes, N.; Züchner, H., Electrochemical methods for studying diffusion, permeation and solubility of hydrogen in metals. Journal of the Less Common Metals 1976, 49, 223-240.
Koila, M., Trapping effect in diffusion of interstitial impuritl atoms in BCC lattices. Acta metallurgica 1974, 22 (10), 1259-1268.