Abstract
Here the present paper proposes a method employing micro-area X-ray diffraction analysis to evaluate local hydrogen concentration behavior. Hydrogen concentrating around a crack tip significantly accelerates crack propagation in metals, i.e., hydrogen embrittlement. The concentration behavior of hydrogen has not been revealed yet. In order to solve mechanism of hydrogen embrittlement, hydrogen concentration behavior in local area, e.g., a crack tip, has to be cleared by not only a numerical analysis but also an experimental approach. The present study takes notice of hydrogen-induced lattice strain and X-ray diffraction was employed to detect variation of lattice spacing before and after hydrogen charging. Here we demonstrate using X-ray diffraction applied to a micro area that hydrogen concentrates around an elastic-plastic boundary at vicinity of a crack.
