Assessment of microstructural changes in Grade 91 power station tubes through permeability and magnetic Barkhausen noise measurements
Assessment of microstructural changes in Grade 91 power station tubes through permeability and magnetic Barkhausen noise measurements
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通过磁导率和巴克豪森磁性噪声测量评估 91 级电站管道的微观结构变化
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Peyton
中科院分区：
文献类型：
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作者：
John W. Wilson;Jun Liu;N. Karimian;C. Davis;J. Anthony;Peyton
与较弱的合金相比，在高温发电厂应用中使用 91 级钢可以大幅减少部件厚度，从而减少热应力并延长使用寿命。尽管 91 级比行业中使用的其他牌号具有卓越的抗热疲劳和抗蠕变能力，但这取决于特定微观结构的创建和维护，而该微观结构可以通过常规部件制造、安装和维护来改变。电磁检查有可能通过现场测量来评估钢部件的退化程度。在这项工作中，绘制了经过热处理的 91 级样品的微观结构变化与电磁特性（包括增量磁导率和微分磁导率以及巴克豪森噪声）之间的相关性。这些相关性首先通过使用基于实验室的闭磁环系统检查加工样品来建立，然后转移到管样品的开磁环测量。结果证明了电磁方法用于电站管道现场检查的潜在可行性。
The use of Grade 91 steel for high-temperature power plant applications can result in substantial reductions in component thickness compared to weaker alloys, resulting in reduced thermal stresses and improved service life. Although Grade 91 offers superior resistance to thermal fatigue and creep to other grades used in the industry, this is dependent on the creation and maintenance of a specific microstructure, which can be altered through routine component fabrication, installation and maintenance. Electromagnetic inspection has the potential to assess the level of degradation in steel components through in-situ measurements. In this work, correlations are drawn between microstructural changes in heat treated Grade 91 samples and electromagnetic properties including incremental and differential permeability and Barkhausen noise. These correlations are first established by examining machined samples using a closed magnetic loop, lab-based system, and then transferred to open magnetic loop measurement of tube samples. The results demonstrate the potential viability of electromagnetic methods for inspection of power station tubes in-situ.