GH4698涡轮盘锻件超声检测底波损失原因及影响分析  

Cause and influence analysis of bottom wave loss in ultrasonic inspection for turbine disk forgings GH4698

作　　者：尹湘蓉 Yin Xiangrong(Engineering Technology Research Center,AECC Aero Science and Technology Co.,Ltd.,Chengdu 610503,China)

机构地区：[1]中国航发航空科技股份有限公司工程技术研究中心

出　　处：《锻压技术》2018年第9期141-145,共5页Forging & Stamping Technology

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,highmagnification 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.

关 键 词：GH4698涡轮盘 水浸超声检查 探头频率 底波损失 晶粒度 

分 类 号：TG115.28[金属学及工艺—物理冶金] V252.1[金属学及工艺—金属学]