炭素鋼中の水素拡散に及ぼす焼入れ焼戻し組織の影響

概要

論文の詳細を見る
The effect of quenching and tempering structure of various carbon steels on the diffusivity and solubility of hydrogen were studied at room terhperature by using an electrochemical permeation technique. The minimum diffusion coefficient is obtained when the steels are in as-quenched state, i.e, a martensitic structure and diffusion coefficient increases with increasing tempering temperature. On the other hand, solubility of hydrogen is a maximum for quenched martensitic structure and it decreases with increasing tempering temperature. An increase in carbon content reduces the diffusivity but increases the solubility of hydrogen. The variation in diffusivity and solubility can be explained in terms of hydrogen trapping process involving lattice imperfections such as dislocation, lattice vacancies and subgrain boundaries produced by martensitic transformation.