Measurement of texture and formability parameters with a fully automated, ultrasonic instrument

Thompson, R. B.; Papadakis, E. P.; Bluhm, D.; Alers, G. A.; Forouraghi, K.; Skank, H.D.; Wormley, S. J.

doi:10.1007/bf00565908

Cited by 15 publications

(7 citation statements)

References 21 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: 85%

“…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%

“…Ear formation in the final drawing procedure has been correlated to ultrasonically determined texture parameters by Lu et al (Lu, Morris and Gu, 1991) and by Thompson et al (1993). Lu defined a texture parameter related to wave speed anisotropy.…”

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: 85%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrasonic Characterization of Rolling and Recrystallization Textures in Aluminum

Anderson¹,

Thompson²,

Bolingbroke³

et al. 1996

Texture, Stress, and Microstructure

Self Cite

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“…As stated in Chapter 1, the major objective of the present study has been to investigate the capabilities and accuracy of the present ultrasonic instrument, Ultra-Form, in a more controlled manner than was done previously as reported in reference (2). In addition to the industrial interest in pursuing future development of an on-line nondestructive measurement of r-values, this work was primarily motivated by the desire to further explain the agreement which was obtained between the ultrasonic data and the traditional tensile test data which were taken in 1990 ( Fig.…”

Section: Chapter6 Conclusionmentioning

confidence: 99%

“…Both the ultrasonic and X-ray technologies have evolved in recent years to the point that automated, microprocessor-based, instruments for assessment of sheet steels drawability (rvalues) have been designed and evaluated (1)(2)(3)(4)(5)(6)(7). These include prototypes of inspection sys tems for use as both in static (2) and on-line modes (1,(3)(4)(5)(6)(7).…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic measurement of drawability (r-values) of low carbon steel sheets

Forouraghi

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The Accuracy and Repeatability of Ultrasonic measurements 6.2 Sensitivity to the Microstructure (Texture) 6.3 The Factors that Affect Ultrasonic Predictions of Plastic Properties 6.3.1 Effects of Coatings 6.3.2 Effects of Accurate Set of Elastic Constants 6.3.3 Effects of Early Truncation of Higher Order ODC's 6.4 Choice of Modeling in Ultrasonic Prediction of Plastic Properties 195 BIBLIOGRAPHY 197 vi ACKNOWLEDGMENTS I am sincerely indebted to my major professor, Dr. R. B. Thompson for providing me an opportunity to work on this challenging and interesting task. He followed my progress with interest and gave me encouragement and valuable guidance throughout this work. I am grateful for his precise and thorough review of this thesis. I would also like to express appre ciations to my co-major professors Drs. Scrutton and Molian for their support of this work. Dr. Scrutton enriched this research with numerous papers published by the previous re searchers in this field. I am grateful for his generous efforts and his input. I would like to extend my appreciations to the members of my graduate committee, Drs. Izworski, Papadakis and Hall. I am indebted to Dr. Izworski for providing me a chance to visit the Dearborn Stamping Plant at Ford Motor Company and his valuable input regarding the prac tical industrial problems in the forming industry. I would also like to thank Dr. Papadakis for many useful discussions regarding the ultrasonic device, Ultra-Form. I am grealty indebted to Dr. Frtitz Reis at LTV Steel Company and Dr. Ming Shi at Na tional Steel Corporation for providing the steel samples and the tensile data. I am also greatful for their most valuable discussions and ideas regarding this research. I would like to express my appreciations to Drs. Okiishi and Bathi in Mechanical Engi neering Department for their financial support of my graduate studies. I would like to thank my wife, Amy, and my children. Aria, Farhad and Lailei for their patience and support. I am indebted to my brother. Dr. Babak Forouraghi, for his constant encouragement throughout this research. Finally, the last but not the least, to my parents, Ali and Homa, whose valuable support and encouragements have been the inspiration behind my graduate studies.

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Elastic-Wave Propagation in Random Polycrystals: Fundamentals and Application to Nondestructive Evaluation

Thompson

Topics in Applied Physics

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Measurement of texture and formability parameters with a fully automated, ultrasonic instrument

Cited by 15 publications

References 21 publications

Ultrasonic Characterization of Rolling and Recrystallization Textures in Aluminum

Ultrasonic Characterization of Rolling and Recrystallization Textures in Aluminum

Ultrasonic measurement of drawability (r-values) of low carbon steel sheets

Elastic-Wave Propagation in Random Polycrystals: Fundamentals and Application to Nondestructive Evaluation

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