Simulation of Hydrogen Diffusion in Duplex Stainless Steel

doi:10.16183/j.cnki.jsjtu.2018.09.012

Abstract

Abstract: Duplex stainless steels (DSS) are subjected to a deleterious effect known as hydrogen embrittlement. Due to the difference of the ratio of various alloying elements and the influence of processing technology, the volume fraction of austenite phase (φγ) will be changed. Hydrogen diffusion models with different φγ were established based on transient finite element mass diffusion in program—Abaqus. In addition, the discrepancies of hydrogen diffusion in both transverse and longitudinal microstructure were implemented. After the simulation analysis, the apparent diffusion coefficients (Dapp) of the models were calculated. The results show that Dapp decreased with the increase of φγ, and there is a linear relationship between ln Dapp and φγ; the values of hydrogen diffusion coefficient are greater when the elongated austenite is orientated parallel with the direction of hydrogen flux, i.e. the transverse samples are more susceptible to hydrogen embrittlement than longitudinal samples.

Key words: hydrogen diffusion, duplex stainless steel (DSS), volume fraction, diffusion coefficient

CLC Number:

TG 111.6

TAO Ping,WANG Yanfei,GONG Jianming,WU Weijie,LIANG Tao. Simulation of Hydrogen Diffusion in Duplex Stainless Steel[J]. Journal of Shanghai Jiaotong University, 2018, 52(9): 1086-1091.

References

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