Preprint Article Version 1 This version is not peer-reviewed

Improvement of Ultrasonic Inspection of the Forging Titanium Alloy

Version 1 : Received: 7 May 2019 / Approved: 9 May 2019 / Online: 9 May 2019 (12:47:50 CEST)

How to cite: Tranca, T.; Radu, I. Improvement of Ultrasonic Inspection of the Forging Titanium Alloy. Preprints 2019, 2019050111 (doi: 10.20944/preprints201905.0111.v1). Tranca, T.; Radu, I. Improvement of Ultrasonic Inspection of the Forging Titanium Alloy. Preprints 2019, 2019050111 (doi: 10.20944/preprints201905.0111.v1).

Abstract

Titanium’s accelerating usage in global markets is attributable to its distinctive combination of physical and metallurgical properties. The key to best utilizing titanium is to exploit these characteristics, especially as they complement one another in a given application, rather than to just directly substitute titanium for another metal. Titanium alloy are extensively used in aerospace applications such as components in aero-engines and space shuttles, mainly due to their superior strength to weight ratio. For these demanding applications functionality and reliability of components are of great importance. To increase flight safety, higher sensitivity inspections are sought for rotating parts. Increased sensitivity can be applied at the billet stage, the forging stage, or both. Inspection of the forging geometry affords the opportunity to apply the highest sensitivity due to the shorter material paths when compared to those required for billet inspections. Forging inspection is typically performed for titanium (Ti) rotating parts with immersion inspection and fixed-focus, single-element transducers. Increased gain is required with depth because the ultrasonic beam attenuates with distance and diverges beyond the focus position that is placed near the surface. The higher gain that is applied with depth has the effect of increasing the UT noise with depth. The relationships between the UT noise, selection of the examination technique and the smallest detectable defect are presented in this material.

Subject Areas

pulse volume; signal noise ratio; automated ultrasonic testing; simulation software

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