OVERLOADING BEHAVIOUR OF CORROSION FATIGUE CRACK INITIATION FOR 300M STEEL

Acta Metall Sin

1993, Vol. 29

Issue (11): 66-73 DOI:

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OVERLOADING BEHAVIOUR OF CORROSION FATIGUE CRACK INITIATION FOR 300M STEEL

LU Minxu;ZHENG Xiulin Northwestern Polytechnical University; Xi'an

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LU Minxu;ZHENG Xiulin Northwestern Polytechnical University; Xi'an. OVERLOADING BEHAVIOUR OF CORROSION FATIGUE CRACK INITIATION FOR 300M STEEL. Acta Metall Sin, 1993, 29(11): 66-73.

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Abstract The periodic and simple overloading behaviours of fatigue crack initiation inair and in 3.5% NaCl solution were experimentally studied and theoretically analyzed for300M (40CrMnSiNiMoV) steel. Retardation intensity of retardating crack initiation of corro-sion fatigue of simple overloading is significantly smaller than the corresponding value of pe-riodic overloading in 3.5% NaCl solution. The overloading retardation intensity increaseswith the increase of overloading ratio or level of equivalent stress amplitude value in air and in3.5% NaCl solution without exception. The physical essential resulting in the above-men-tioned results was also explored theoretically from several respects of residual stress, stress re-laxation and environment effect. If only the simple overloading retardation law is consideredin corrosion fatigue crack initiation life prediction, the very conservative life prediction wouldbe obtained. Only if the retardation laws of simple overloading and periodic overloading arecomprehensively considered, the comparatively higher precision life prediction can be ob-tained.

Key words: corrosion fatigue crack initiation simple overloading periodic overloading 300M steel

Received: 18 November 1993

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1993/V29/I11/66

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