2 1/4Cr-1Mo 鋼の水素拡散係数の温度依存性

概要

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Temperature dependence of hydrogen diffusivity in as-quenched 2 1/4Cr-1Mo steel at temperatures of 25 to 300℃ was investigated by a glycerine displacement increasing (GDI) method and a electrochemical method. In the determination of residual hydrogen by GDI method, hydrogen was charged at a austenitic temperature range under a hydrogen atmosphere and was discharged in isothermal baths at temperatures of 45 to 300℃. 1) The hydrogen evolution curves measured by GDI method at 45℃ and by a electrochemical method at 25℃ in cylindrical specimens agree well with a analytical solution given from Fick's Law. 2) Measured hydrogen diffusivities in as-quenched 2 1/4Cr-1Mo steel agree considerably well with the values calculated from a theoretical equation based on a hydrogen trap theory. The apparent hydrogen diffusivity, D, is given as the following equation : D=D_l/(1+κ) (cm^2/s) where, D_l=7.6×10^<-4>exp(-2300/RT) (cm^2/s) κ=1.05×10^<-4>exp(7100/RT) R : gas constant T : absolute temperature
社団法人日本鉄鋼協会の論文
1984-01-01