Development of Acoustic Microscope for High Attenuated and Anisotropic Inconel Alloy Welding Part

高衰减各向异性铬镍铁合金焊接件声学显微镜的研制

• 批准号: 06452332
• 负责人: MIHARA Tsuyoshi
• 金额: $ 3.52万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452332/
• 关键词: Inconel Alloy; Acoustic Microscope; Hg Coupler; Welding; Velocity Measurement; V(z) Curve; Local Velocity; V(z)曲線; 音響レンズ; 水銀カプラー

Since ultrasonic inspection depend strongly on the an isotropy in ultrasonic velocity of structural materials, an isotropy in ultrasonic velocity must be investigated. Most suitable measurement system for this an isotropy is Line-focus-beam Acoustic Microscope because anisotropic behavior has complicate and local distribution.However, Acoustic Microscope cannot usually applied for many anisotropic materials because anisotropic materials apt to show high attenuation. In this research, then, we develop the new Acoustic Measurement system for high attenuated materials by using Hg coupler instead of conventional water coupler. New types of acoustic lens and scanner were developped for Hg coupler and V(z) curve for stainless steel and inconel alloy were obtained which cannot measure by water coupler. By using these Acoustic Microscope system, acoustic Image near welding part of inconel alloy were clearly observed and quantitative velocity dependence of ultrasonic propagating direction were measured by Hg coupler. As the results, developped Hg coupler Acoustic Microscope system was useful for acoustic measurement of high attenuated materials.

由于超声波检测强烈依赖于结构材料的超声波速度的各向同性，因此必须研究超声波速度的各向同性。最适合这种各向同性的测量系统是线聚焦束声学显微镜，因为各向异性行为具有复杂的局部分布。然而，声学显微镜通常不能应用于许多各向异性材料，因为各向异性材料容易表现出高衰减。在这项研究中，我们通过使用汞耦合器代替传统的水耦合器，开发了用于高衰减材料的新型声学测量系统。针对汞耦合器开发了新型声透镜和扫描仪，获得了水耦合器无法测量的不锈钢和铬镍铁合金的V(z)曲线。通过使用这些声学显微镜系统，清晰地观察了铬镍铁合金焊接部分附近的声学图像，并通过汞耦合器测量了超声波传播方向的定量速度依赖性。结果，开发的汞耦合器声学显微镜系统可用于高衰减材料的声学测量。