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首页> 外文期刊>Journal of Materials Engineering and Performance >Exploiting Acoustic Anisotropy to Detect Recrystallization in a Ni Single Crystal Using Ultrasonic Nondestructive Inspection
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Exploiting Acoustic Anisotropy to Detect Recrystallization in a Ni Single Crystal Using Ultrasonic Nondestructive Inspection

机译：利用超声非破坏性检查检测声学各向异性以检测Ni单晶中的再结晶

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摘要

Ultrasonic inspection was used to detect regions of recrystallization (RX) within a single crystal of Ni. RX can produce polycrystalline regions within single-crystal (SX) materials. Because RX regions act as initiator sites for failure by fatigue-crack growth in otherwise SX Ni-based superalloys, RX is an issue of direct concern for the service life of high-performance turbine blades. Detection and discrimination of RX regions in single-crystal materials are significant challenges for current nondestructive inspection technologies. The present study leverages the elastic anisotropy of single crystals, which produces acoustic anisotropy, to ultrasonically detect and characterize RX regions produced within single-crystal specimens. Single crystals of pure Ni were processed to create controlled regions of RX. These specimens were ultrasonically examined in an immersion tank using a high-resolution, polyvinylidene fluoride transducer to detect acoustic impedance changes across the boundaries between different crystals (i.e., grains) within the RX region. Data from time-of-flight and absolute peak amplitude measurements were used to create acoustic images that were compared against electron microscope images of the RX regions. The ultrasonic inspection technique described here successfully detected not only the locations of RX regions, but also the approximate sizes and shapes of the RX regions.
机译：超声波检查用于检测Ni的单晶中重结晶（Rx）的区域。 RX可以在单晶（SX）材料中产生多晶区域。因为RX区域充当疲劳裂纹增长失败的引发位点，因为SX Ni的超合金，RX是对高性能涡轮叶片的使用寿命直接关注的问题。单晶材料中RX区域的检测和辨别是目前无损检测技术的重大挑战。本研究利用单晶的弹性各向异性，其产生声学各向异性，以超声检测和表征单晶标本中产生的RX区域。处理纯NI的单晶以产生Rx的受控区域。使用高分辨率的聚偏二氟乙烯换能器在浸入罐中进行超声检查这些样品，以检测在Rx区域内不同晶体（即晶粒）之间的边界的声阻抗变化。从飞行时间和绝对峰值幅度测量的数据用于创建与RX区域的电子显微镜图像进行比较的声学图像。这里描述的超声检查技术不仅成功地检测了RX区域的位置，而且成功地检测到RX区域的近似尺寸和形状。

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