構造用高張力鋼中の水素核酸に及ぼす焼入れ焼もどし組織の影響 (<小特集>X線材料強度小特集)

概要

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The effects of quenched and tempered microstructures on the diffusion coefficient and solubility of hydrogen in structural low-alloyed high strength steels have been investigated at room temperature by means of the electrochemical permeation technique. The results obtained are as follows : (1) The as-quenched martensitic structure gives a low diffusion coefficient, and the diffusion coefficient first increases with tempering temperature up to 200-300℃. Then the diffusion coefficient decreases until it reaches a minimum at about 450-550℃, after which it increases again at temperatures of 600℃ and above. The mixed structure of bainite, martensite and ferrite obtained by furnace cooling of HT80 and HY130 steels above Acl gives a very low diffusion coefficient. (2) The solubility of hydrogen changes inversely with the diffusion coefficient. (3) The variation in diffusion coefficient or solubility can be interpreted in terms of the hydrogen trapping process at the lattice imperfections introduced by martensitic and/or bainitic transformation, such as dislocations, faults, subgrain boundaries and lattice vacancies, etc., or at the interface between the ferrite and carbide precipitates, depending upon the tempering temperature.
社団法人日本材料学会の論文
1978-03-15