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| THE EFFECT OF ANODIC DISSOLUTION AT CRACK TIP ON CRACK GROWTH CORROSION FATIGUE |
| Han Guangwei and Song Yujiu (Xi'an Jiaotong University) |
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Abstract The relationship between corrosion current density (i_a)and strain rate ((?)) as well as plastic strain (ε_p) was measured for 40CrNiMo steel tempered at moderate temperature in the simulated medium of corrosion fatigue tip by employing Pt-wire and 40CrNiMo steel respectively as auxiliary electrode under various tensile rates. The result of which is shown as following: i_a=K_1·(?)_e~A+K_2·(?)~B[1-exp(-ε_p] The analysis of elasto-plastic finite element to the strain at fatigue crack tip was carried out in order to obtain the relationship of crack growth rate induced by anodic dissolution at crack tip of corrosion fatigue with △K. The result showed that the direct contribution of anodic dissolution at crack tip to the crack growth of corrosion fatigue in 3.5% NaCl aqueous solution was very little for 40CrNiMo steel, the major effect of anodic dissolution was to affect the cathodic process at crack tip which supplies hydrogen atoms for hydrogen induced cracking in the fracture process zone of corrosion fatigue.
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Received: 25 August 1991
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[1] Suresh, S. et. al., Metall. Trans. 12A, 1435(1981)
[2] Parkins. R. N., Corrosion, 43(3) , 130(1987)
[3] Doing, P. et. al., Metall. Fraus. 8A(12) , 1994(1977)
[4] K. Nakasa et. al., Engg. Fract, Mech., 17, 445(1983)
[5] 何亚东等,中国腐蚀与防护学报8(2) ,141(1988)
[6] Coug Leton. John, et. al., Corrosion Fatigue, ASTM/STP8018 |
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