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| THE RETARDATION OF INCIPIENT STRESS CORROSION CRACK CROWTH IN SMOOTH SPECIMENS UNDER LOW FRE QUENCY CYCLIC LOADING |
| Yu Jjan(Shanghai Research Institute of Materials; China) R. N. Parkins(The University of Newcastle upon Tyne; U. K.) |
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Cite this article:
Yu Jjan(Shanghai Research Institute of Materials; China) R. N. Parkins(The University of Newcastle upon Tyne; U. K.). THE RETARDATION OF INCIPIENT STRESS CORROSION CRACK CROWTH IN SMOOTH SPECIMENS UNDER LOW FRE QUENCY CYCLIC LOADING. J Chin Soc Corr Pro, 1988, 8(3): 182-188.
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Abstract Smooth specimens of 70/30 brass exposed to 1N NaNO_2 aqueous solution were used to investigate the retardation of incipient stress corrosion crack growth under low frequency cyclic loading (LFCL), a phenomenon previously observed in smooth specimens of mild steel when tested in carbonate/bicarbonate solutions. It is shown that retardation was more pronounced in fine grained brass than in coarse grained brass. Additionally, a greater number of cracks formed at grain boundaries or twin boundaries in the fine grained than in the coarse grained material. The retardation effect on crack growth could be eliminated by the introduction of a pre-crack prior to testing. The results have been interpreted in terms of multiple crack initiations at smooth surfaces which effectively dispersed the strain concentration at crack tips in the incipient growth stage.
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Received: 25 June 1988
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