Drawability Assessment of Steel Sheets by an Ultrasonic Method

Cassier, O.; Donadille, C.; Bacroix, Brigitte

doi:10.1007/978-1-4613-0817-1_278

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Other microstructural features could be playing a role, for example, precip.itates or dislocations will also affect the measured velocity. However, since no such sign discrepancies have been reported on the large number of aluminum samples that have been studied previously Cassier, Donadille, Bacroix, 1989;Borsutski et al, 1993;Thompson et al, 1993), we expect that the experimental difficulties is the likely cause. Unfortunately, we cannot remeasure the ultrasonic velocities because the samples have been subsequently destroyed.…”

Section: Differentiation Of Rolling and Recrystallization Texturesmentioning

confidence: 88%

“…In steel sheet, several researches have demonstrated the ability to characterize texture and use this information to predict formability parameters such as plastic strain ratios (Sayers, 1982;Cassier, Donadille, Bacroix 1989;Hirao et al, 1989;Clark Jr. et al, 1990;Borsutzki et al, 1993;Kawashima, Hyogushi, Akagi, 1993;Thompson et al, 1993). Much less work has been done in aluminum, .in part because the single crystal anisotropy is considerably smaller and hence much more precise velocity measurements are required.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic Characterization of Rolling and Recrystallization Textures in Aluminum

Anderson¹,

Thompson²,

Bolingbroke³

et al. 1996

Texture, Stress, and Microstructure

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Crystallographic texture, which plays an important role in many forming operations, is developed during sheet metal processing. Improved product quality could be achieved if the texture could be measured, quickly and inexpensively, during different stages of the processing. One potential scheme, involving measurement of the angular dependence of the speed of ultrasonic waves propagating in the plane of the sheet is described, as applied to aluminum. While this technique has been successfully used in steel sheets, application to aluminum is more difficult because of the smaller elastic anisotropy of the crystallites. This paper presents the results of a detailed study of the strengths and weaknesses of the approach. Included are discussions of signal processing factors, the accuracy of the ultrasonically determined C/, and a comparison between C measured by ultrasonics and by diffraction techniques (both X-ray and neutron). It is found that relative velocity measurements are very good for determining C4 2 and C4 3. These measurements can easily distinguish between rolling and recrystallization textures, and can also detect more subtle variations in recrystallization textures. A systematic offset in the prediction of C4 is also reported, which is believed to be a consequence of unknown alloy dependence of the single crystal elastic constants and texture free velocities, quantities which play a key role in inferring this quantity from absolute measurements.

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Section: Differentiation Of Rolling and Recrystallization Texturesmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Ultrasonic Characterization of Rolling and Recrystallization Textures in Aluminum

Anderson¹,

Thompson²,

Bolingbroke³

et al. 1996

Texture, Stress, and Microstructure

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Application of a Fourier Transform-Phase-Slope Technique to the Design of an Instrument for the Ultrasonic Measurement of Texture and Stress

Wormley

Forouraghi

et al. 1990

Review of Progress in Quantitative Nondestructive Evaluation

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This paper describes the development of an ultrasonic instrument to measure texture (preferred grain orientation), stress, and related physical properties in metal sheets in industrial environments. The technique is based on precise measurements of the speed of guided modes, including angular variations, and is made practical by the use of EMAT transducers, which require no couplant. The instrument is expected to find important initial applications in predicting sheet metal formability, either as a process control tool in the rolling mill or as a quality control tool in a stamping shop.Since the instrument will offer an improved measurement capability not presently available to industry, a much broader range of applications may develop, including measurements of stress and porosity in sheet and other simple geometries.BACKGROUND

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A comparison of ultrasonic and X-ray determinations of texture in thin Cu and Al plates

et al. 1989

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Drawability Assessment of Steel Sheets by an Ultrasonic Method

Cited by 5 publications

References 7 publications

Ultrasonic Characterization of Rolling and Recrystallization Textures in Aluminum

Ultrasonic Characterization of Rolling and Recrystallization Textures in Aluminum

Application of a Fourier Transform-Phase-Slope Technique to the Design of an Instrument for the Ultrasonic Measurement of Texture and Stress

A comparison of ultrasonic and X-ray determinations of texture in thin Cu and Al plates

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