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| INFLUENCE OF HYDROGEN ON CYCLIC DEFORMATION BEHAVIOUR OF PURE Ni |
| HOU Yaoyong;WANG Chongmin;WANG Chunbo Lanzhou University |
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Cite this article:
HOU Yaoyong;WANG Chongmin;WANG Chunbo Lanzhou University. INFLUENCE OF HYDROGEN ON CYCLIC DEFORMATION BEHAVIOUR OF PURE Ni. Acta Metall Sin, 1985, 21(3): 36-44.
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Abstract 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.
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Received: 18 March 1985
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