Orientation imaging using spatially resolved acoustic spectroscopy

Smith, Richard J.; Sharples, S. D.; Li, W.; Clark, Matt; Somekh, Michael Geoffrey

doi:10.1088/1742-6596/353/1/012003

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…The laser generated SAWs propagate across a small region of the sample and are detected by a continuous detection laser. By determining the velocity of the Rayleigh waves in many directions and comparing these measurements to known relationships between crystal orientation and the speed of sound, a map can be produced showing the grain structure and orientation of the crystal lattice (Smith et al, 2012). Further information on these crystal relationships can be found from Farnell (1970).…”

Section: Ultrasonic Techniquesmentioning

confidence: 99%

“…Early SRAS research focused on orientation measurements in cubic single crystal materials (Sharples et al, 2006) but has since been expanded to show that the technique is capable of evaluating grain orientation in polycrystalline materials (Smith et al, 2012). One study (Smith et al, 2014) showed that crystallographic texture misorientation angles within coarse-grained Ti-6Al-4V and Aluminium could be evaluated to a standard deviation of less than 1.5°.…”

Section: Ultrasonic Techniquesmentioning

confidence: 99%

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Destructive and non-destructive testing methods for characterization and detection of machining-induced white layer: A review paper

Brown

Wright

M’Saoubi³

et al. 2018

CIRP Journal of Manufacturing Science and Technology

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The presence of machining-induced white layer in the near-surface of critical aeroengine alloys has a detrimental effect on the lifetime of a component. Present techniques for identifying and characterizing white layer, such as optical microscopy and hardness testing, whilst effective, are destructive, costly and time-consuming. Non-destructive testing methods may, therefore, offer improvements to the process of white layer detection. This paper discusses the formation mechanisms and the defining physical properties of machininginduced white layers before offering a comprehensive review of the current state-of-the-art in both destructive and non-destructive testing methods for detecting this anomalous surface feature.

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Section: Ultrasonic Techniquesmentioning

confidence: 99%

Section: Ultrasonic Techniquesmentioning

confidence: 99%

Destructive and non-destructive testing methods for characterization and detection of machining-induced white layer: A review paper

Brown

Wright

M’Saoubi³

et al. 2018

CIRP Journal of Manufacturing Science and Technology

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show abstract

“…In addition, it generates a separate optical map of the surface being inspected. Previously, SRAS has been used to measure the grain orientation of large-grained materials such as nickel, titanium and silicon [8][9][10] . As an NDT technique, SRAS is uniquely placed to address many of the challenges instigated by SLM.…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved Acoustic Spectroscopy Towards Online Inspection of Additive Manufacturing

Pieris¹,

Patel²,

Dryburgh³

et al. 2019

insight

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High-integrity engineering applications such as aerospace will not permit the incorporation of components containing any structural defects. The current generation of additive manufacturing (AM) platforms yield components with relatively high levels of defects. The in-line inspection of components built using AM can provide closed-loop feedback and vary build parameters during fabrication to minimise defects. This article reviews the capability of spatially resolved acoustic spectroscopy (SRAS) to be used as an inspection tool for detecting defects and characterising microstructure in parts induced by variations in build parameters. The authors first correlated changes to surface acoustic wave velocity and an increase in defects to variations in build laser power, then identified changes to the component microstructure caused by variations in build laser scan strategy. This was carried out using the detected probe light intensity and the measured surface acoustic velocity.

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Crystallographic texture can be rapidly determined by electrochemical surface analytics

Speidel

Mitchell-Smith

et al. 2018

Acta Materialia

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Orientation imaging using spatially resolved acoustic spectroscopy

Cited by 6 publications

References 3 publications

Destructive and non-destructive testing methods for characterization and detection of machining-induced white layer: A review paper

Destructive and non-destructive testing methods for characterization and detection of machining-induced white layer: A review paper

Spatially Resolved Acoustic Spectroscopy Towards Online Inspection of Additive Manufacturing

Crystallographic texture can be rapidly determined by electrochemical surface analytics

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