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首页> 美国政府科技报告 >Analysis of Alloy 600 and X-750 stress corrosion cracks.
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Analysis of Alloy 600 and X-750 stress corrosion cracks.

机译：合金600和X-750应力腐蚀裂纹分析。

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A few months ago, KAPL evidence supported the view that Primary or Pure Water Stress Corrosion Cracking (PWSCC) of Alloy 600 results from a hydrogen mechanism. Figure 1 shows an Analytical Electron Microscope (AEM) analysis of a stress corrosion crack (SCC) crack in an A600 split tube U-bend specimen exposed to primary water at 338(degree)C (640(degrees)F) for 462 days. The features which appear to confirm a hydrogen mechanism are: (1) A very narrow (< 200 (angstrom)) crack with a sharp tip, nearly free of deposits. (2) No evidence of severe plastic deformation in the region immediately ahead of the crack tip. (3) A line of small voids preceding the main crack tip, of which the largest is about 5 x 10(sup (minus)6) cm in length. Shen and Shewmon proposed that PWSCC of Alloy 600 occurs due to small microvoids ahead of a main crack tip. The hypothesis is that such voids result from pockets of methane gas formed by the reaction of atomic hydrogen with carbon in the base metal. The voids are about 10 x 10(sup (minus)6) cm diameter, approximately a factor of 2 larger than the largest voids.

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