机器翻译，参考下
High temperature alloy material widely used in various components in Aeroengine,as the aircraft engine constantly upgrading,the performance of high temperature alloy are increasingly high requirements,therefore the nondestructive detection of high temperature alloy materials become more and more strict.So far, no corresponding detection method for the detection of longitudinal crack in high temperature alloys.Typically,it is good detection method detection of longitudinal crack in plate from the side,due to the high temperature alloy wheel diameter is very large, and high-temperature alloy material attenuation is larger so from the side effect of poor detection.Based on the research of the various characteristics of high temperature alloy,and comparison of ultrasound every available means,the final decision was detected from the end of high temperature alloy plate,the detection method of longitudinal transducer combined with shear wave angle probe V tandem longitudinal crack of high temperature alloy discs were detected.first,design and fabrication of the test block, with flat bottom holes and gaps of the two artificial defects to represent the longitudinal crack in high temperature alloys.<?xml:namespace prefix="o" ns="urn:schemas-microsoft-com:office:office"></?xml:namespace>
The main contents include:Design and fabrication of the oblique probe, in preparation for the experiment;Acoustic measurement of high temperature alloy material, the analysis on the influence of different parameters on the detection effect;Design of experiments are performed to verify the detection method.
By analyzing the experimental results available:for large crack at high temperature alloy discs can be employed to detect the method of longitudinal wave straight probe.For the crack disk smaller can use shear wave sending and receiving type detection method.The,detect need to combine the two methods in the actual test.
