采用电化学渗透方法,测定了氢在(α+γ)双相不锈钢中的扩散渗透曲线。氢的表观扩散系数与奥氏体含量(f_γ)的关系为:D=0.27+0.9/f_γ~2(10~(-10)cm~2/s),初步证明氢在(α+γ)双相不锈钢中主要是通过α相和γ相“串联”扩散,扩散系数D≈D_αD_γ/(f_γ~2D_α+f_α~2D_γ),其中D_α,D_γ分别为氢在α相和γ相中的扩散系数,f_α,f_γ分别为α和γ相的体积分数。
The permeation curves of hydrogen in (α+γ) duplex stainless steelhave been electrochemically determined. The apparent diffusivity of hydrogen de-pends on the austenite content (fγ) at room temperature, D=(0.27+0.9/f_γ~2) (10~(-10)cm~2/s). It is simply verified that hydrogen in (α+γ) duplex stainless steel diffusesin "series-connection" form through both ferrite and austenite, the apparent diffu-sivity is D≈D_αD_γ/(f_α~2D_γ+f_γ~2D_α), where D_αD_γare respectively diffusivity of hydrogenin ferrite and austenite, f_α,f_γare volume fraction, in turn, of ferrite and aus-tenite.
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