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Effect of hydrogen on the Young's modulus of iron

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Abstract

A Bordoni type apparatus was used to measure the change of the apparent Young's modulus ofα-Fe induced by hydrogen. The solution of the flexural vibration equation of a beam under stress indicatesE = C(σ)ω 2. If the resonant frequencies of the first and the third tone are measured at about the same time,E andσ can be calculated. The change of the apparent Young's modulus after charging with hydrogen is defined as ΔE = ΔE 1(H) + ΔE 2, where ΔE 1(H) relates to the change of the perfect crystal interatomic cohesive force and ΔE 2 is induced by the change of stress. An artificially partial stress relaxation test was carried out to measure ΔE 2. The results show that during aging, after both charging with hydrogen and artificial stress releasing, the change of the apparent modulus is the same,i.e., ΔE = ΔE 2. Thus, the ΔE 1(H) associated with the interatomic cohesive force does not evidently change during aging with escaped hydrogen of 7 to 8 wppm at room temperature,i.e., this amount of hydrogen does not decrease the interatomic cohesive force ofα-Fe.

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Authors and Affiliations

  1. Department of Metal Physics, Beijing University of Iron and Steel Technology, China

    Tong-Yi Zhang (Postgraduate Student), Wu-Yang Chu (Associate Professor) & Chi-Mei Hsiao (Professor)

  2. Department of Physics, Beijing University of Iron and Steel Technology, China

    Fang-Xing Jiang (Lecturer)

Authors
  1. Tong-Yi Zhang
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  2. Fang-Xing Jiang
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  3. Wu-Yang Chu
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  4. Chi-Mei Hsiao
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Zhang, TY., Jiang, FX., Chu, WY. et al. Effect of hydrogen on the Young's modulus of iron. Metall Trans A 16, 1655–1662 (1985). https://doi.org/10.1007/BF02663021

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  • DOI: https://doi.org/10.1007/BF02663021

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