WANG Fuhui Institute of Corrosion and Protection of Metals
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Academia Sinica
,
Shenyang
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ChinaBIAN Weimin Northeast University of Technology
,
Shenyang
,
China Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China
金属学报(英文版)
The space group of PrCo_(12)B_6,compound has been determined using the convergent beam elec- tron diffraction method.The space group is found to be R3m.
关键词:
convergent beam electron diffraction
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null
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WEI Xuejun ZHOU Xiangyang LI Jin LIU Guanglei KE Wei Corrosion Science Laboratory
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Academia Sinica
,
Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
A computerized digital speckle-interferometry(SPI)system has been set up to determine the in-plane distribution of displacement and strain at crack tip of CF specimens.The principle and the experimental method of this technique are described in detail.The effect of corrosion factors on plastic deformation at crack tip in CF process has been examined by comparing the near-tip strain fields of steel A537 before and after hydrogen charging,and of pure copper before and after applying an anodic current in 3.5% NaCl. The results shows that the clasic finite element mathematical models are not suitable to describe the near-tip deformation under the experimental conditions.Hydrogen charging made the crack tip plasticity decreased for steel A537 and the anodic dissolution enhance the near tip deformation of pure copper specimen.
关键词:
speckle-interferometry
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null
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LI Jin WANG Zengfu KE Wei Corrosion Science Laboratory
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Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
Influence of applied potentials and loading waveform on the fatigue crack growth for steel A537 in 3.5% NaCl solution,and corresponding straining electrode behaviour have been studied.Under the applied potentials over or below -800mV(SCE),the anodic dissolution or the hydrogen embrittlement is predominatant,respectively.For applied anodic potential,the acceleration effect of continuous loading pattern on the CF crack growth mainly appeared at the range of low ΔK values,while for cathodic potential,it appeared at the high ΔK values.The continuous straining causes a decrease of natural potential and an increase of anodic dissolution current.
关键词:
corrosion fatigue
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null
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null
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null
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PEI Hongxun Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China
金属学报(英文版)
Based on the experimental study of complex biaxial mode Ⅰ fatigue crack growth and the discussion on Von Mises'theory,a new approach is proposed for correlating crack propaga- tion rate under both in-phase and out-of-phase biaxial stress cycling.The results emphasize the contribution of plasticity to fatigue crack growth.
关键词:
biaxial stress
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null
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null
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