Laser ultrasonic inspection of additive manufactured components

Davis, Geo; Nagarajah, Romesh; Palanisamy, Suresh; Rashid, Rizwan Abdul Rahman; Rajagopal, Prabhu; Balasubramaniam, Krishnan

doi:10.1007/s00170-018-3046-y

Cited by 106 publications

(32 citation statements)

References 32 publications

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“…The void fraction of the entire sample was 0.87%. The average size of the porosities was approximately 50 µm with actual values in the range of 30 to 110 µm, which was better than the results in previous work [30].…”

Section: X-ray Computed Tomographycontrasting

confidence: 71%

“…The XCT method was able to determine the hole inside the sample with hole diameters smaller than 0.4 mm. We compared the sizes and locations of holes obtained from LUT and XCT results, and the holes obtained from our LUT system were smaller than those in the previously published work [30]. Therefore, the XCT results validated the results obtained from the LUT system.…”

Section: X-ray Computed Tomographysupporting

confidence: 63%

“…However, the internal hole defect of 0.4 mm diameter was not visible in either the B-Scan or C-Scan image. Compared with previous work [19,30], the LUT system made improvement and achieved a resolution in sub-millimeter scale. Further work should be done to find the relationship between gate setting and hole parameters (diameter, depth, etc.)…”

Section: Laser Ultrasonic Testingmentioning

confidence: 84%

“…Everton et al evaluated the use of laser-generated surface waves to detect artificially set-in holes in titanium alloy (Ti-6Al-4V) samples fabricated by AM; only holes with a diameter larger than 0.725 mm were identified from B-Scan images [29]. Davis et al proposed a self-established LUT system to evaluate AM parts, with hole defects of 2 mm diameter identified in B-Scan and C-Scan images [30]. Cerniglia et al proposed a laser ultrasonic technique for in-line inspection of laser powder deposition (LPD) parts.…”

Section: Introductionmentioning

confidence: 99%

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Detection of Internal Holes in Additive Manufactured Ti-6Al-4V Part Using Laser Ultrasonic Testing

Zhang

et al. 2020

Applied Sciences

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For a non-contact, non-destructive quality evaluation, laser ultrasonic testing (LUT) has received increasing attention in complex manufacturing processes, such as additive manufacturing (AM). This work assessed the LUT method for the inspection of internal hole defects in additive manufactured Ti-6Al-4V part. A Q-switched pulsed laser was utilized to generate ultrasound waves on the top surface of a Ti-6Al-4V alloy part, and a laser Doppler vibrometer (LDV) was utilized to detect the ultrasound waves. Sub-millimeter (0.8 mm diameter) internal hole defect was successfully detected by using the established LUT system in pulse-echo mode. The method achieved a relatively high resolution, suggesting significant application prospects in the non-destructive evaluation of AM part. The relationship between the diameter of the hole defects and the amplitude of the laser-generated Rayleigh waves was studied. X-ray computed tomography (XCT) was conducted to validate the results obtained from the LUT system.

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Section: X-ray Computed Tomographycontrasting

confidence: 71%

Section: X-ray Computed Tomographysupporting

confidence: 63%

Section: Laser Ultrasonic Testingmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

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Detection of Internal Holes in Additive Manufactured Ti-6Al-4V Part Using Laser Ultrasonic Testing

Zhang

et al. 2020

Applied Sciences

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“…The addition of magnesium to aluminum increases its strength through solid solution strengthening and also improves its strain hardening ability [ 10 ]. Although significant amount of works are published on AlSi 10 Mg, the research work on AlSi 12 and other Al-Si alloys, including A356 and A357, is still evolving [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Section: 3d-printing Of Aluminium Alloys By Slmmentioning

confidence: 99%

Mechanical Properties of SLM-Printed Aluminium Alloys: A Review

et al. 2020

Self Cite

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Selective laser melting (SLM) is a powder bed fusion type metal additive manufacturing process which is being applied to manufacture highly customised and value-added parts in biomedical, defence, aerospace, and automotive industries. Aluminium alloy is one of the widely used metals in manufacturing parts in SLM in these sectors due to its light weight, high strength, and corrosion resistance properties. Parts used in such applications can be subjected to severe dynamic loadings and high temperature conditions in service. It is important to understand the mechanical response of such products produced by SLM under different loading and operating conditions. This paper presents a comprehensive review of the latest research carried out in understanding the mechanical properties of aluminium alloys processed by SLM under static, dynamic, different build orientations, and heat treatment conditions with the aim of identifying research gaps and future research directions.

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High‐Sensitivity Profilometry for Measurement of Multilayer Structure with Low‐Coherence Composite Interferometer

Lin

Cheng

Hsu

2021

Adv Materials Technologies

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High‐sensitivity profilometry provides valuable tools for measurement of the surface structure of a device. On the other hand, tomographic techniques such as ultrasound imaging or optical coherence tomography can be used to measure the inner structure of a device with micrometer resolution. However, the multilayer structure of a device such as a display panel cannot be measured with nanometer sensitivity using conventional profilometry and tomographic techniques. For this purpose, a new type of profilometry based on the technique of low‐coherence composite interferometer is proposed and demonstrated. With the phase compensation mechanism of the technique, phase fluctuation resulted from the instability of scanning component and environment can be significantly reduced and a high axial sensitivity can be achieved. The technique is demonstrated by measuring nine interfaces of a display panel with a displacement sensitivity of 11.73 nm without requiring any preknowledge on the structure and has the potential to become a new technique for inspecting the multilayer structure of a packaged device in industry.

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Laser ultrasonic inspection of additive manufactured components

Cited by 106 publications

References 32 publications

Detection of Internal Holes in Additive Manufactured Ti-6Al-4V Part Using Laser Ultrasonic Testing

Detection of Internal Holes in Additive Manufactured Ti-6Al-4V Part Using Laser Ultrasonic Testing

Mechanical Properties of SLM-Printed Aluminium Alloys: A Review

High‐Sensitivity Profilometry for Measurement of Multilayer Structure with Low‐Coherence Composite Interferometer

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