The effects of environmental factors (PH Value、electrode potential) and mechanical factor (load frequency) on the behaviour of chemically short cracks have been investigated under fatigue loading on A537CL1 steel. The medium used was 3.5%Nacl solution. The results show that the upper limit length of chemically short crack is longer than that of physically short carck. The growth rate of chemically short crack is strongly effected by enviromental factors (PH value、electrode potential) and mechanical factor (load frequency) and characterized by uncertainty. The upper limit length a~* of chemically short crack and the growth rate at crack a~* increase as the PH values lower and potential is more negative; the reduction of load frequency can also cause larger crack growth rate in chemically short crack. Hydrogen embrittlement plays an important role in chemically short crack growth of A537cl1 steel in 3.5% Nacl solution. Based on which, the experimental results wee well explained and the chemically short crack size was analyzed.
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