锻压技术

GH4698涡轮盘锻件超声检测底波损失原因及影响分析

英文标题：Cause and influence analysis of bottom wave loss in ultrasonic inspection for

作者：尹湘蓉

分类号：TG115.28; V252.1

出版年,卷(期):页码：2018,43(9):141-145

摘要：

结合某型发动机GH4698涡轮盘锻件进行C扫描图像分析，研究了涡轮盘锻件不同区域的低倍组织、高倍组织以及力学性能，采用5和2.25 MHz探头对涡轮盘锻件进行超声检测，阐述了其底波损失结果出现差异的原因及机理。研究结果表明：本试验选取的涡轮盘锻件采用5 MHz探头超声检测时出现底波损失，底波损失区域的晶粒度、高倍组织、硬度和拉伸性能等与正常区域相比无明显差异，涡轮盘锻件超声检测时，局部区域存在面积状底波损失是由于锻件晶粒尺寸不均匀、局部晶粒尺寸较其他区域晶粒尺寸更大所致；采用2.25 MHz探头超声检测时未出现超声波严重衰减和底波损失超标。

The C-scanning image analysis for engine turbine disk forgings GH4698 was conducted, and low-magnification structure, high-magnification structure and mechanical properties of turbine disk forgings in different regions were studied. Then, the ultrasonic inspection for turbine disk forgings was realized by 5 MHz and 2.25 MHz probes respectively, and the reason and mechanism of the difference of bottom wave loss results were explained. The result shows that the grain size, high-magnification structure, hardness and tensile properties in the bottom wave loss region, which are tested by ultrasonic inspection with 5 MHz probe, have no significant difference from those in the normal region. During ultrasonic inspection for turbine disk forgings, the area-like bottom wave loss existing in local region is caused by the uneven grain size of forging and larger grain size of local region than other regions. However, the serious attenuation of ultrasonic wave and exceeding of bottom wave loss are not observed by the ultrasonic inspection with 2.25 MHz probe.

基金项目：

尹湘蓉（1968-），女，硕士，高级工程师 E-mail：1106531505@qq.com

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