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11. 发明专利

JP2013092432A Life estimation of metallic material due to occurrence of stress corrosion crack, and inspection planning system for structure used under corrosive water environment 有权
标题翻译：应力腐蚀裂缝发生金属材料的生命估计，以及腐蚀性水环境下使用的结构检查规划系统
公开(公告)号：JP2013092432A
公开(公告)日：2013-05-16
申请号：JP2011234144
申请日：2011-10-25
申请人： Hitachi-Ge Nuclear Energy Ltd , 日立Geニュークリア・エナジー株式会社
发明人： OKIZAKI NAOYA , ISHIBASHI MAKOTO , KOSHIISHI MASATO , OBATA RYOJI
IPC分类号： G01N17/00 , G01N3/18
摘要： PROBLEM TO BE SOLVED: To provide a method for quantitatively estimating life until the occurrence of a stress corrosion crack (SCC) in a metallic material to constitute a structure used under corrosive environment.SOLUTION: A metallic material exhibits susceptibility to the occurrence of SCC at a configured lower limit px of the thickness of a surface oxide film. The time tx for the thickness p of the surface oxide film to reach the lower limit px is obtained from the time dependency of the surface oxide film shown as a solid line in a drawing. Subsequently, an event as a fracture factor of the surface oxide film is assumed. In the case that the event occurs after the reaching time tx, the occurrence of SCC is possible due to the corrosion progress in a base material resulting from the breaking of the oxide film. An SCC progress due to the corrosion of base material is shown as a dash line in a drawing. The possibility whether the occurrence of SCC is present or not is then determined. When the resulting determination is that the possibility of the occurrence of SCC is present, the event occurrence time is estimated as life L until the occurrence of SCC.
摘要翻译：要解决的问题：提供一种用于定量估计寿命的方法，直到在金属材料中发生应力腐蚀裂纹（SCC），以构成在腐蚀环境下使用的结构。解决方案：金属材料在表面氧化膜的厚度的配置下限px处表现出对SCC的发生的敏感性。表面氧化膜的厚度p达到下限px的时间tx是从图中以实线表示的表面氧化膜的时间依赖性获得的。随后，假定作为表面氧化膜的断裂因子的事件。在事件到达时间tx之后发生的情况下，由于氧化膜断裂导致的基体材料的腐蚀进行，可能发生SCC。由于基材的腐蚀导致的SCC进展在图中以虚线表示。然后确定SCC的发生是否存在的可能性。当所得到的确定是存在SCC发生的可能性时，事件发生时间被估计为直到发生SCC为止的寿命L. 版权所有（C）2013，JPO＆INPIT

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