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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >MONITORING OF PRECIPITATION HARDENING IN AN HSLA STEEL THROUGH EMAT MEASUREMENTS OF MAGNETOSTRICTION
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MONITORING OF PRECIPITATION HARDENING IN AN HSLA STEEL THROUGH EMAT MEASUREMENTS OF MAGNETOSTRICTION

机译：通过磁致伸缩电声测量对HSLA钢中的析出硬化进行监测

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摘要

EMAT measurements may be used to determine key features of the magnetostriction of steel. Estimates of the relative magnetostriction are most accurate at near-saturation magnetic fields, and, although the low-field peak tends to be underestimated, the field at which it occurs is predicted correctly. EMAT measurements of magnetostriction can be used to monitor the evolution of CRPs in A710 steel. The high-field average magnetostriction changes linearly with the lattice strain and hardness introduced by CRPs. The peak-aged state occurs when the high-field average magnetostriction is maximized. Results of this investigation suggest that EMATs might be useful for inspecting nuclear reactor pressure vessels to locate zones of irradiation-enhanced embrittlement caused by the formation of CRPs. This technique has the advantage of measuring the magnetostriction in the near-surface zone, which is where one would expect to find the majority of irradiation damage.
机译：EMAT测量可用于确定钢磁致伸缩的关键特征。在接近饱和磁场下，相对磁致伸缩的估计最准确，尽管低场峰值趋于被低估，但发生该磁场的场是正确预测的。 EMAT测量的磁致伸缩可用于监测A710钢中CRP的演变。高场平均磁致伸缩随CRP引入的晶格应变和硬度线性变化。当高场平均磁致伸缩最大化时，会出现峰值时效状态。这项研究的结果表明，EMATs可能有助于检查核反应堆压力容器，以找到由CRP形成引起的辐射增强脆化区域。这项技术的优势是可以测量近表面区域的磁致伸缩，在该区域中人们会期望找到大部分的辐射损伤。

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