采用静电激发调频检测法对比研究了电解充氢和人为部分应力松弛对高纯铁和工业纯铁杨氏模量的影响。结果表明,电解充氢导致应力部分松弛,从而引起表观弹性模量的下降;但在随后放氢过程中E的回升量与人为应力部分松弛后的室温时效过程中E的升高量相当,均为0.1—0.3％。说明电解充氢渗入7—8 ppm的氢对铁原子键合力没有明显影响。 应用悬丝共振法研究了氢对工业纯铁弹性模量的影响也获得了同样的结果。
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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