Investigation into Ultrasonic Testing of Thick Walled Austenitic Welds
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摘要: 由于奥氏体焊缝中材料性能的各向异性和微观组织结构的不同, 奥氏体焊缝的超声波检测是非常困难的。超声波在奥氏体焊缝中会沿金属结晶方向发生偏转, 并在焊缝边界上发生散射。过去十年来, 人们开发了多种模拟各向异性材料中声波传播的仿真工具。本文则以常规超声波检测方法为基础, 将声线跟踪法和弹性动力学有限积分技术(EFIT)相结合, 应用于含晶间应力腐蚀裂纹的厚壁奥氏体焊缝中, 其结果显示声线跟踪法和弹性动力学有限积分技术(EFIT)结合应用, 有助于超声波检测参数的选取。
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关键词:
- 奥氏体焊缝 /
- 超声波检测 /
- 弹性动力学有限积分技术 /
- 仿真 /
- 裂纹
Abstract: The ultrasonic testing(UT) of austenitic welds is difficult because they are not only anisotropic material in terms of elastic properties but heterogeneous material in terms of microstructure properties. The ultrasound wave in the austenitic weld is skewed along with crystallographic directions and scattered at weld boundaries. Since past decade, several tools for simulation of the wave propagation in highly anisotropic materials have been developed. In this paper, ray tracing and elastodynamic finite integration technique(EFIT) are applied to thick walled austenitic welds containing intergranular stress corrosion cracks(IGSCC) based on conventional UT method. It is demonstrated that the application of the ray tracing combined with EFIT shown in this paper can facilitate the selection of UT parameters. -
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