摘要
单晶材料声速各向异性的特点使传统超声测量在对其厚度测量时存在一定误差。从理论上推导立方晶系单晶材料{100}晶面内的声速模型,设计加工立方晶系单晶材料的声速测量试块,测量超声入射角与晶体不同取向下纵波声速大小,求得该材料的实际声速模型。从模型中发现该材料不同晶体取向下纵波声速在5300～6130m/s内变化,变化幅度约15.6%。该模型为立方晶系单晶叶片的壁厚误差修正提供了可靠的数据支持。
Because of the anisotropism of single crystal materials,there often exist some errors in measuring the wall thickness of single crystal materials using traditional ultrasonic testing methods.A sonic velocity model of {100} crystal face of cubic-system single crystal materials was deduced.In addition,a special single crystal sample was prepared for sonic velocity testing,and the sonic velocities were measured under different incident angle and crystal orientation.Finally,a sonic velocity model suitable for this single crystal material was obtained.According to the model,the sonic velocity of this material varies from 5 300 m/s to 6 130 m/s under different crystal orientation,covering a variation amplitude of about 15.6%.This model can be used to amend the measurement results of the wall thickness of cubic system single crystal turbine blades.
出处
《失效分析与预防》
2010年第2期65-69,共5页
Failure Analysis and Prevention
关键词
单晶材料
各向异性
立方晶系
声速模型
超声测厚
single crystal
anisotropism
cubic crystal system
sonic velocity model
ultrasonic inspection
