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J Chin Soc Corr Pro  1994, Vol. 14 Issue (4): 255-264    DOI:
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A MODEL OF HYDROGEN EVOLUTION AND TRANSPORT AT CRACK TIP FOR DESCRIBING THE EFFECT OF WAVEFORM ON CORROSION FATIGUE AND THE EXPERIMENTAL VERIFICATION THEREOF
Lu Minxu; Liu Xiaokun; Wang Jianjun; Zheng Xiulin(Northwestern Polytechnical University)
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Abstract  A quantitative analysis based on comprehensive kinetic consideration of deformation and electro chemical hydrogen evolution reaction on crack tip surface was carried out for the effect of waveform on hydrogen evolution reaction.A new concept was proposed of dislocation transport of hydrogen atom in metal matrix interior at the crack tip.On the basis of this concept,a quantitative model was developed of the effect of waveform on hydrogen dislocation transport process.Then the relative magnitude of corrosion fatigue craCk growth rate was calculated and compared with for the three waveforms including triangle(TR), positive sawtooth(PS),and negative sawtooth(NS).Finally,experimental studies were conducted with these three waveforms for GC-4(40CrMnSiMoVA) steel in 3.5% NaCl solution by measurement of macroscopic fatigue behaviour and by observation of microscopic fracture features.It was concluded thatthe test results are in very good agreement with the predicted results.
Key words:  Corrosion fatigue crack growth; Waveform effect; Crack tip hydrogen evolution model; Hydrogen dislocation transport model     
Received:  25 August 1994     
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Lu Minxu; Liu Xiaokun; Wang Jianjun; Zheng Xiulin(Northwestern Polytechnical University). A MODEL OF HYDROGEN EVOLUTION AND TRANSPORT AT CRACK TIP FOR DESCRIBING THE EFFECT OF WAVEFORM ON CORROSION FATIGUE AND THE EXPERIMENTAL VERIFICATION THEREOF. J Chin Soc Corr Pro, 1994, 14(4): 255-264.

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https://www.jcscp.org/EN/     OR     https://www.jcscp.org/EN/Y1994/V14/I4/255

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