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

Abstract

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.

Evolution of microstructure and crystallographic texture during recrystallisation of high-strength sheet steel

“…This was performed by the ultrasonic method using the Module-r testing system of Tinius Olsen make, as discussed elsewhere. 18…”

Ultrasonic texture characterization of aluminum, zirconium and titanium alloys

“…The accuracy in the ultrasonic determination of C/' using the scheme described in this paper depends strongly on the selection of SCECs. The proper determination of the SCECs for the particular alloy being studied, a result that has been successfully employed in steel (Forouraghi, 1995;Daniel. Jonas.…”

Ultrasonic Characterization of Rolling and Recrystallization Textures in Aluminum

“…The accuracy in the ultrasonic determination of Ca ll using the scheme described in this paper depends strongly on the selection of SCECs. The proper determination of the SCECs for the particular alloy being studied, a result that has been successfully employed in steel (Forouraghi, 1995;Daniel, Jonas, 1990) would presumably yield improved results and this will be the subject of further study. Other ultrasonic schemes, which infer C4 ll from relative rather than absolute velocity measurements should also be considered (Li and Thompson, 1989;Kawashima, 1990;Kawashima, Hyogushi and Akagi, 1993).…”