水素チャージした600合金のぜい化

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タイトル別名
  • Embrittlement of Hydrogen-Charged Alloy 600
  • スイソ チャージシタ 600 ゴウキン ノ ゼイカ

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The embrittlement during the electrolytic hydrogen charging at 25-80°C and its recovery during hydrogen outgassing at 60-160°C after the charging were examined on Alloy 600 in some details with regard to tensile properties, fracture surface, and X-ray diffraction. Although thin layer of hydride was formed on the specimen surface during the charging, it was unstable and disappeared after the outgassing, leaving local lattice strain in the underlying metal. Many cracks on the specimen surface were observed along (100) traces on grains and grain boundaries. Brittle fracture always occured at grain boundaries in tensile test. Tensile strength and strain at fracture decreased with the increases in charging time and temperature. There was a relation, h∝t1/2, between the depth of brittle layer (h) and charging time (t). The activation energy for the diffusion of hydrogen atoms obtained from the temperature dependence of h/t1/2 was estimated to be 10.6kcal/mol. On the other hand, activation energy for recovery process, calculated from Arrhenius plot of the relation between the time of 50% recovery of the strain at fracture and outgassing temperature, was evaluated to be 12.7kcal/mol. These results show that the processes of both embrittlement and its recovery are rate-determined by the diffusion of hydrogen atoms in the metal.

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