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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >ULTRASONIC INTERROGATION OF POLYCRYSTALLINE MATERIALS
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ULTRASONIC INTERROGATION OF POLYCRYSTALLINE MATERIALS

机译：聚酯材料的超声波探伤

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摘要

It is accepted that the same features of microstructure that dominate α, attenuation of ultrasonic waves also determine mechanical properties of industrial materials. For example, in polycrystalline metals the grain size greatly influences both ultrasonic attenuation and material strength, ductility, toughness and formability. Since ultrasonic inspection is less expensive than the destructive tests required to assess mechanical properties many analytical and experimental studies have been directed at establishing whether and how features of microstructure may be inferred from ultrasonic inspection data. One significant contribution to attenuation in polycrystalline materials is scattering by the grains and precipitates. This results from interaction with material defects comparable to one wavelength λ in size, such as grain boundaries. Scattering depends on size, shape, orientation and anisotropy of the grains, and the structure, thickness and chemistry of their boundaries. The standard assumptions used when modeling grain scattering are that the discontinuity of the grain boundary is of elastic nature; an individual grain scatterer has a simple shape with the mean grain size D; the grains are randomly located and randomly oriented; the number of grains is large; and the scatter from individual grains is not coherent.
机译：公认的是，主导α的微观结构的相同特征，超声波的衰减也决定了工业材料的机械性能。例如，在多晶金属中，晶粒尺寸极大地影响超声衰减以及材料强度，延展性，韧性和可成形性。由于超声检查比评估机械性能所需的破坏性测试便宜，因此许多分析和实验研究都致力于确定是否可以从超声检查数据中推断出微观结构的特征以及如何推断出微观结构的特征。多晶材料衰减的一个重要贡献是晶粒和沉淀物的散射。这是由于与与缺陷相媲美的材料缺陷（例如晶界）的相互作用而引起的。散射取决于晶粒的大小，形状，方向和各向异性，以及其边界的结构，厚度和化学性质。在对颗粒散射进行建模时，使用的标准假设是，晶界的不连续性具有弹性。单个颗粒散射体的形状简单，平均粒径D；晶粒是随机定位和随机取向的；谷物数量多；并且各个晶粒的散布不连贯。

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