对充分退火的、晶粒尺寸约30—40μm的工业纯镍试样,分别在未充氢、电解充氢和充氢-驱氢情况下进行了恒应变幅对称拉-压低循环疲劳试验,应变幅范围从2.7×10~(-3)到4.9×10~(-3).记录了一定循环周数后的塑性滞后回线,由此测量了循环应力峰值σ_p,摩擦应力σ_F和反向应力σ_B实验表明,该镍试样充氢后,除疲劳至断裂的总寿命有明显降低外,循环硬化速率、达到饱和时的应力峰值σ_p和摩擦应力σ_F均有降低,并随应变幅的增加越趋明显,而反向应力σ_B则不因充氢而有明显变化.结合扫描电镜观察的结果进行了分析讨论.
Symmetrical push-pull low-cyclic fatigues with constant strain amplitude,ranged from 2.7×10~(-3)to 4.9×10~(-3),were performed on well-annealed commercialpure(99.98%)Ni polycrystalline specimens with grain size about 30-40 μm underhydrogen-charged,hydrogen-free and hydrogen charged-dehydrized respectively.The cyclic peak stresses σ_P,friction stresses σ_F and back stresses σ_B were deter-mined by the fatigue hysteresis loops.It was shown that the σ_P at saturation,theσ_F and the hardening rate as well as the total fatigue life decreased remarkably withincreasing of strain amplitude but σ_B changed no more under hydrogen-charged.The influence of hydrogen on the cyclic deformation behaviour of pure Ni hasalso been discussed in combination with the SEM observation.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] | |
| [15] | |
| [16] | |
| [17] |
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