DIFFUSION OF HYDROGEN IN (α+γ) DUPLEX STAINLESS STEEL

Acta Metall Sin

1989, Vol. 25

Issue (1): 42-47 DOI:

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DIFFUSION OF HYDROGEN IN (α+γ) DUPLEX STAINLESS STEEL

HE Jianhong;TANG Xiangyun;CHEN Nanping Tsinghua University; Beijing

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HE Jianhong;TANG Xiangyun;CHEN Nanping Tsinghua University; Beijing. DIFFUSION OF HYDROGEN IN (α+γ) DUPLEX STAINLESS STEEL. Acta Metall Sin, 1989, 25(1): 42-47.

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Abstract 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.

Key words: hydrogen diffusion duplex stainless steel

Received: 18 January 1989

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