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| THE EFFECT OF MECHANICAL FACTORS ON SCC INITIATION OF PIPELINE STEEL |
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| 中国科学院金属研究所金属腐蚀与防护国家重点实验室 |
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Abstract The influence of stress ratio, loading frequency and additional stress on TGSCC initiation of X70 pipeline steel was mainly studied and ESEM observations of corrosion sample surfaces were carried out. The results showed that: low stress ratio increased the fluctuation of load, which facilitated the crack initiation of SCC of pipeline steel; the low frequency was in favor of initiation of TGSCC when the samples endured the same cycles of the fluctuating load; but the fast frequency was benefit to TGSCC initiation when the samples suffered the same time of the fluctuating load; and in our work no obvious effect of additional stress on the crack initiation was observed.
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Received: 08 January 2007
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