水素侵食におけるメタン気泡径と密度の水素拡散係数・密度変化測定による推定

概要

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The quations to estimate the density and the radius of bubbles formed in the incubation period for hydrogen attack of 2.25 Cr-1 Mo steel were proposed. By relating the hydrogen diffusivity and the change in density of steel with the bubble density ρ_s and the bubble radius γ, it is derived that ρ_s=(L^^-_AK^3)/(72πΔγ^3(-Δρ/ρ)^2) γ=(3Δγ(-Δρ/ρ))/K where Δρ/ρ is the change in density caused by bubbles, Δγ is the thickness of shell around each bubble which acts as trapping site of hydrogen atoms, K is the total volume of the shells and L^^-_A is the mean intercept length of prior austenite grains. The hydrogen diffusivity and the change in density were measured on the quenched and tempered steel which had been exposed to high temperature and high pressure hydrogen atmosphere. ρ_s and γ obtained by substituting these values into the above equations agreed well with the microscopical observation.
1987-07-01