Location

Brunswick, ME

Start Date

1-1-1997 12:00 AM

Description

The high-strength alloys used in the aerospace industry today are inspected ultrasonically for material anomalies which may have resulted from the manufacturing process. These materials, such as titanium alloys, often have a large macro-grain structure which limits the sensitivity of the ultrasonic inspection to material anomalies. As a result, there has been much work directed towards developing inspection techniques which minimize the level of the reflections from the macro-grains and enhance the reflections from the material anomalies. In particular, the affect of transducers parameters such as transducer bandwidth, focus, and frequency on the signal-to-noise ratio of synthetic anomalies in titanium alloys has been investigated [1–3]. This investigation showed that the level of the grain noise relative to a known calibration target decreases in Ti-A16-V4 (Ti6-4) and Ti-A15-Sn2-Zr2-Mo4-Cr4 (Ti17) and the signal-to-noise ratio of synthetic anomalies with planar geometries in Ti6-4 increases as the volume of the ultrasonic pulse in the material decreases. This paper will extend these results to planar synthetic anomalies in Ti17 and non-planar synthetic anomalies in Ti6-4. In addition, a transducer design methodology for high sensitivity inspection based on managing the size of the ultrasonic pulse volume is presented and the implications of using this method for production inspections are described.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

16A

Chapter

Chapter 4: NDE Sensors

Section

UT Fields and Probes

Pages

893-900

DOI

10.1007/978-1-4615-5947-4_116

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Transducer Design for High Sensitivity Ultrasonic Inspection of Titanium

Brunswick, ME

The high-strength alloys used in the aerospace industry today are inspected ultrasonically for material anomalies which may have resulted from the manufacturing process. These materials, such as titanium alloys, often have a large macro-grain structure which limits the sensitivity of the ultrasonic inspection to material anomalies. As a result, there has been much work directed towards developing inspection techniques which minimize the level of the reflections from the macro-grains and enhance the reflections from the material anomalies. In particular, the affect of transducers parameters such as transducer bandwidth, focus, and frequency on the signal-to-noise ratio of synthetic anomalies in titanium alloys has been investigated [1–3]. This investigation showed that the level of the grain noise relative to a known calibration target decreases in Ti-A16-V4 (Ti6-4) and Ti-A15-Sn2-Zr2-Mo4-Cr4 (Ti17) and the signal-to-noise ratio of synthetic anomalies with planar geometries in Ti6-4 increases as the volume of the ultrasonic pulse in the material decreases. This paper will extend these results to planar synthetic anomalies in Ti17 and non-planar synthetic anomalies in Ti6-4. In addition, a transducer design methodology for high sensitivity inspection based on managing the size of the ultrasonic pulse volume is presented and the implications of using this method for production inspections are described.