摘要
为了研究超声波特征信号与材料组织之间的关系,以TB6钛合金锻件为研究对象,通过水浸超声检测方法对锻件端面以C扫描的形式分析了噪声水平及底波分布情况,利用光学显微镜对声衰减系数及超声波探伤噪声水平的不同区域进行了微观组织分析,利用电子背散射衍射技术对低倍组织不均匀区域的β晶粒及取向进行了分析。结果表明:TB6钛合金锻件端面方向底波一致性较好,最大幅值变化≤5%;厚度方向约30~50 mm范围内存在噪声信号异常区域,最大当量为Φ0.8 mm-2 dB。锻件表面的声速及声衰减系数波动较为稳定,差异较小;厚度方向约30~50 mm范围内可以观察到清晰的金属流线走向,并沿锻件径向分布。锻件高倍组织中α相均匀分布,平均晶粒尺寸约为3.21~3.56μm;β晶粒表层至心部的平均晶粒尺寸由7.14μm增大至8.89μm、最大极密度由7.83增大至23.56。区域Ⅲ形成了强织构组织,该现象造成了TB6钛合金锻件超声波噪声水平的异常增大。
In order to study the relationship between ultrasonic characteristic signals and material microstructure,TB6 titanium alloy forgings were taken as the research object.The noise level and backwave distribution on the end surface of forgings were analyzed in a C-scanning form using water-immersion ultrasonic testing method.The microstructures of regions with different ultrasonic attenuation coefficients and ultrasonic testing noise levels were analyzed using the optical microscope,and theβgrains and orientations in areas with uneven lowmagnification microstructure were analyzed using electron backscatter diffraction technology.The results show that the backwave consistency in the end surface direction of TB6 titanium alloy forgings is relatively good,with the maximum amplitude variation of≤5%.Noise signal anomaly areas exist within the thickness range of approximately 30-50 mm,with the maximum equivalent ofΦ0.8 mm-2 dB.The velocity of sound and ultrasonic attenuation coefficient on the surface of forgings fluctuate relatively stably with minor differences.Within the thickness range of about 3050 mm,clear streamline directions can be observed,distributing along the radial direction of forgings.In the high-magnification structure of forgings,theαphase is uniformly distributed,with the average size of approximately 3.21-3.56µm.The average size ofβgrains from the surface layer to the core increases from 7.14µm to 8.89µm,and the extreme density increases from 7.83 to 23.56.Region III forms a strong textured microstructure,which causes an abnormal increase in the ultrasonic noise level of TB6 titanium alloy forgings.
作者
高怀宝
王建国
孙上清
刘柯
杨晓琨
史蒲英
高慧贤
王凯旋
Gao Huaibao;Wang Jianguo;Sun Shangqing;Liu Ke;Yang Xiaokun;Shi Puying;Gao Huixian;Wang Kaixuan(Western Superconducting Materials Technology Co.,Ltd.,Xian 710018,China)
出处
《锻压技术》
北大核心
2026年第2期241-247,共7页
Forging & Stamping Technology
基金
陕西省共性技术研发平台资助(2024ZG-GXPT-03)。
关键词
TB6钛合金
超声波探伤
晶粒取向
微观组织
声衰减系数
TB6 titanium alloy
ultrasonic testing
crystal orientation
microstructure
ultrasonic attenuation coefficient
