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Information × Registration Number 0207U004975, 0106U008557 , R & D reports Title Investigation of the effect of the different aggressive factors on the fatigue crack growth resistance of the oil pipeline material popup.stage_title Head Tsyrulnyk Oleksandr Tymofiyovych, Registration Date 31-10-2007 Organization Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine popup.description2 Residual water, which is gathered on the low part of pipe of oil trunkline, causes the ambiguous effect on the parameters of fatigue crack growth in pipe steel. At the test at corrosion potential and anodic polarization the threshold level Kth.is increased and crack growth in prethreshold region is decreased due to corrosion crack tip blunting and, correspondingly, stress relaxation. Additions of chlorides, which intensify local corrosion of steel, do not effect on the parameters of corrosion fatigue crack growth. A sensitivity of pipe steel to corrosion-fatigue fracture by the mechanism of hydrogen embrittlement is increased with stress ration rising. In-service steel degradation intensifies its corrosion-fatigue fracture by the mechanism of hydrogen embrittlement. Effect of degradation is increased with stress ratio rising. Product Description popup.authors popup.nrat_date 2020-04-02 Close