A simulation model of ultrasonic wave changes due to irradiation-induced microstructural evolution of thick 304 stainless steel blocks
A simulation model of ultrasonic wave changes due to irradiation-induced microstructural evolution of thick 304 stainless steel blocks
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DOI：
10.1016/j.jnucmat.2013.07.007
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发表时间：
2013-10
影响因子：
3.1
通讯作者：
J. Etoh;M. Sagisaka;T. Matsunaga;Y. Isobe;T. Okita
中科院分区：
文献类型：
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作者：
J. Etoh;M. Sagisaka;T. Matsunaga;Y. Isobe;T. Okita
期望开发一种能够非破坏性地测量核反应堆的厚结构部件中的各种形式的辐射诱导退化的超声检查技术。特别令人感兴趣的是开发的技术，可以阐明的微观结构的组件，增加或减少组件的体积或改变机械或物理性能，所有引起的空间变化的中子通量谱，辐照温度和所施加的stress.Ultrasonic测试是一个广泛使用的非破坏性测试技术的材料特性。超声波作为一种无损检测裂纹的技术，其与微结构部件相互作用的结果是发生变化，这些变化可以用来测量辐照引起的微结构变化。为了评估辐照引起的微结构变化的深度分布，我们在下面建立了一个数值模拟模型的超声波变化引起的奥氏体不锈钢的微观结构的变化的理论基础上，超声波传播在这个模拟中，我们主要集中在简化分布的空隙膨胀，实验发现占主导地位的厚不锈钢块从EBR-II反射器的微观结构。模拟产生的结果与实验结果一致，提供了信心，这种技术确实可以用来询问反应堆内部组件，不仅测量体积平均膨胀，但也在厚组件膨胀的深度分布。这项研究表明，这项研究中开发的技术有可能被开发作为一种新的检测技术，用于检测辐照-引起的微观结构变化，特别是空隙膨胀。
It is desired to develop an ultrasonic inspection technique capable of non-destructively measuring various forms of irradiation-induced degradation in thick structural components of nuclear reactors. Of particular interest is development of techniques that can elucidate the spatial distribution of microstructural components that increase or decrease component volume or that change mechanical or physical properties, all arising from spatial variations in neutron flux-spectra, irradiation temperature and applied stresses.Ultrasonic testing is one of the widely used non-destructive testing techniques for material characterization. Ultrasonic waves, currently used as a non-destructive technique to detect cracks, change as a result of interacting with microstructural components and these changes can be employed to measure irradiation-induced changes in microstructure.In order to evaluate the depth distributions of irradiation-induced microstructural changes, we develop below a numerical simulation model of ultrasonic wave changes caused by microstructural changes in austenitic stainless steel based on the theory of ultrasonic wave propagation. In this simulation we focus primarily on simplified distributions of void swelling which were experimentally found to dominate the microstructures of thick stainless steel blocks removed from the EBR-II reflector. The simulation produced results that were consistent with the experimental results, providing confidence that this technique can indeed be used to interrogate reactor internal components to measure not only the bulk-averaged swelling but also the depth distribution of swelling in thick components.This study revealed that the technique developed in this study has the potential to be exploited as a new inspection technique for detecting irradiation-induced microstructural changes, especially for void swelling.