HYDROGEN PERMEATION AND DIFFUSION IN ALLOY INCOLOY 903

Abstract

Abstract: Permeability and diffusivity of hydrogen in Fe-Ni-Co based superalloy lncoloy 903 were measured over the temperature range of 220 to 420℃ using a gaseous permeation technique. The effect of strengthening phase γ' precipitated after being aged on the hydrogen permeation and diffusion was investigated.It was indicated that the permeability and diffusivity of hydrogen in the alloy hardly depend on heat treatment condition and are not af- fected by γ' phase precipitated after being aged.The relationships between the permeability and diffusivity of hydrogen and the temperature can be respectively expressed as Φ=9.36×10~(-5)exp[-54.20(kJ/mol)/RT]mol/m·s·MPa~(1/2)and D=4.24×10~(-7)exp[-49.07(kJ/mol)/RT]m~2/s.

Key words: hydrogen permeation, hydrogen diffusion, superalloy, precipitation phase, Incoloy 903

XU Jian SUN Xiukui CHEN Wenxiu LI Yiyi State Key Laboratory of RSA,Institute of Metal Research,Academia Sinica,China research assistant,Institute of Metal Research,Academia Sinica,Shenyang 110015,China. HYDROGEN PERMEATION AND DIFFUSION IN ALLOY INCOLOY 903[J]. Acta Metallurgica Sinica (English Letters), 1993, 6(3): 163-167.

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HYDROGEN PERMEATION AND DIFFUSION IN ALLOY INCOLOY 903

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