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| THE INFLUENCE OF LOADING ON CONDITIONAL ΔK_(th) MEASURED ON 4340 STEEL IN SEAWATER |
| Zhang Xiaochun(Shanghai University of Technology) Zheng Wenlong(Shanghai Research Institute of Materials) |
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Abstract Four-point-bending corrosion fatigue tests were used to obtain conditional thresholdst ress intensity range (ΔK_(th)) of 4340 steel in artificial seawater under different initial loading conaition. The morphology of crack propagation near threshold area was examined by scanning electron microscope Results showed that the AKth measured by decrease loading method was lower than that by increase loading method, In stage I of da/dN～ΔK1 curves, the dominant driving force of transgranular crack near the threshold is mechaniealo A slightly increased ΔK_(th) was observed as a consequence of the cathodic protection potential, It is very important to choose an initial. stress intensity factor range(ΔK_(th))in order to determine ΔK_(th) accurately.
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Received: 25 April 1989
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Cite this article:
Zhang Xiaochun(Shanghai University of Technology) Zheng Wenlong(Shanghai Research Institute of Materials). THE INFLUENCE OF LOADING ON CONDITIONAL ΔK_(th) MEASURED ON 4340 STEEL IN SEAWATER. J Chin Soc Corr Pro, 1989, 9(2): 144-152.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1989/V9/I2/144
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