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| EFFECT OF HYDROGEN ON YOUNG'S MODULUS OF Fe |
| by ZHANG Tongyi; JIANG Fangxin; CHU Wuyang; XIAO Jimei(Beijing University of Iron and Steel Technology)(Manuscript received 3 October; 1985; revised manuscript 5 July; 1986) |
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Cite this article:
by ZHANG Tongyi; JIANG Fangxin; CHU Wuyang; XIAO Jimei(Beijing University of Iron and Steel Technology)(Manuscript received 3 October; 1985; revised manuscript 5 July; 1986). EFFECT OF HYDROGEN ON YOUNG'S MODULUS OF Fe. Acta Metall Sin, 1987, 23(6): 457-463.
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Abstract A Bordoni-type apparatus was used to measure the change of apparent Young's modulus of α-Fe induced by hydrogen. The solution of flexural vibration equation for a beam under stress indicates E=C(σ)ω~2. If the resonant frequencies of the first and third tons are measured at about the same time, E and σ can be calculated. The change of 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. To measure ΔE_2, an artificially partial stress relaxation test was carried out. The result shows that during aging, after both charging and artificial stress releasing, the change of apparent modulus is the same, i.e., ΔE=ΔE_2. Thus, ΔE_1(H) associated with the interatomic cohesive force does not evidently change during aging with escaped hydrogen of 7 to 8 ppm at room temperature, i. e., this amount of hydrogen does not decrease the interatomic cohesive force of α-Fe. Forster's horizontal free-ends bar apparatus was also used in present work, the same result as above was obtained.
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Received: 18 June 1987
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