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首页> 外文期刊>International Journal of Pressure Vessels and Piping >Oxide-scale thickness measurement for predicting crack growth history in elevated temperature components
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Oxide-scale thickness measurement for predicting crack growth history in elevated temperature components

机译：氧化物尺度厚度测量，用于预测升高温度分量中的裂纹生长历史

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摘要

Structural components from ferritic steels are known to oxidize in air when exposed to high temperatures and can develop cracks during service. Oxide thicknesson the surface of the crack is related to the exposure time, and temperature and can be used to determine the history of cracks. A model for describing the kinetics of oxide formation in ASTM grade P91 piping steel is developed using flat, polished specimens of the steel and exposing them to high temperatures. Oxide thickness measurements were made and an oxidation kinetics model was developed. Oxide thickness profiles on the creep-fatigue crack surfaces of compact type specimens with a known crack growth history were also characterized using scanning electron microscopy. The oxidation model is then used to predict drack growth rates in compact type specimens. Good agreement between the measured and predicted crack growth rates were found.
机译：已知来自铁素体钢的结构部件在暴露于高温时在空气中氧化，并且可以在服务期间发育裂缝。 氧化物厚度裂缝的表面与曝光时间和温度有关，并且可用于确定裂缝的历史。 用于描述ASTM级P91管道钢中氧化物形成动力学的模型使用钢，抛光标本开发，并将其暴露于高温。 制备氧化物厚度测量并开发了氧化动力学模型。 使用扫描电子显微镜，还表征了具有已知裂纹生长历史的紧凑型样品的蠕变疲劳裂纹表面上的氧化物厚度曲线。 然后使用氧化模型来预测紧凑型样品中的逐次生长速率。 找到了测量和预测的裂缝增长率之间的良好一致性。

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