HE Jianhong TANG Xiangyun CHEN Nanping Tsinghua University
,
Beijing
,
China Professor
,
Division of Metallic Meterials
,
Department of Materials Science and Engineering
,
Tsinghua University
,
Beijing
,
China
金属学报(英文版)
The permeation curves of hydrogen in ferritic-austenitic duplex stainless steel have been electrochemically determined.The apparent diffusivity of hydrogen depends on the austenite content(f_γ)at room temperature,D=(0.27+0.9/f_γ~2)(10~(-10)cm~2/s).It is simply verified that hydrogen in ferritic-austenitic duplex stainless steel diffuses in “series-connection” form through both ferrite grain and austenite grain.The apparent diffusivity is D=D_αD_γ/(f_α~2D_γ+f_γ~2D_α),where D_α,D_γ are diffusivity of hydrogen in ferrite grain and austenite grain respectively,f_α,f_γ are volume fraction,in turn,of ferrite grain and austenite grain.
关键词:
hydrogen
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null
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