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A “Hydrogen partitioning” model for hydrogen assisted crack growth

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Abstract

A “hydrogen partitioning” model has been developed to account for the pressure and temperature dependence for hydrogen-assisted crack growth. The model gives explicit recognition to the role of hydr en-microstructure interactions in determining the distribution (or partitioning) of hydrogen among the various microstructural elements (principally between the prior-austenite grain boundaries and the matrix) and the rate of crack growth along the elements. It also takes into account the role of various rate controlling processes in determining the rate that hydrogen is being supplied to the fracture process (or embrittlement) zone. Quantitative assessment of the model indicates very good agreements between the model predictions and the observed crack growth responses for AISI 4340 and 4130 steels tested in hydrogen and for AISI 4340 steel tested in hydrogen sulfide. This model accurately characterizes the reduction in crack growth rate and the concomitant change in fracture mode at “high” temperatures. Through its integration with the earlier models, based on rate controlling processes, the model predicts the pressure and temperature dependence for K-independent crack growth over the entire range of environmental conditions.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Shanghai Jiaotong University, 1954 Hau San Road, 200030, Shanghai, People’s Republic of China

    M. Gao (Associate Professor)

  2. Department of Mechanical Engineering and Mechanics, Lehigh University, 18015, Bethlehem, PA

    R. P. Wei (Professor of Mechanics)

Authors
  1. M. Gao
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  2. R. P. Wei
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Gao, M., Wei, R.P. A “Hydrogen partitioning” model for hydrogen assisted crack growth. Metall Trans A 16, 2039–2050 (1985). https://doi.org/10.1007/BF02662405

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