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Novel Ultra-High Straining Process for Bulk Materials—Development of the Accumulative Roll-Bonding (ARB) Process

Novel Ultra-High Straining Process for Bulk Materials—Development of the Accumulative Roll-Bonding (ARB) Process. Authored by Y. Saito, H. Utsunomiya, N. Tsuji, T. Sakai Presented by Chris Reeve September 13, 2004. Outline. Introduction Model Design Application Experimental Procedure

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Novel Ultra-High Straining Process for Bulk Materials—Development of the Accumulative Roll-Bonding (ARB) Process

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  1. Novel Ultra-High Straining Process for Bulk Materials—Development of the Accumulative Roll-Bonding (ARB) Process Authored by Y. Saito, H. Utsunomiya, N. Tsuji, T. Sakai Presented by Chris Reeve September 13, 2004

  2. Outline • Introduction • Model • Design Application • Experimental Procedure • Results • Conclusion • Questions

  3. Introduction • Why is Accumulative Roll-Bonding important? • Ultra-fine grain materials exhibit desirable properties • High strength at ambient temperatures • High-speed superplastic deformation at elevated temperatures • High corrosion resistance • Commonly accomplished by intense plastic straining

  4. Introduction • Processes used such as cyclic extrusion compression have two main drawbacks • Requires large load capabilities, expensive dies • Low production rate limits economic viability • Function of paper is to introduce Accumulative Roll-Bonding (ARB) as a bulk manufacturing process

  5. Introduction • References: • 1. Richert, J. and Richert, M., Aluminum, 1986, 62, 604 • 2. Valiev, R. Z., Krasilnikov, N. A. and Tsenev, N. K., Mater. Sci. Engng, 1991, A137, 35. • 3. Horita, Z., Smith, D. J., Furukawa, M., Nemoto, M., Valiev, R. Z. and Langdon, T. G., J. Mater. Res., 1996, 11, 1880. • 4. Saito, Y., Utsunomiya, H., Tsuji, N. and Sakai, T., Japanese Patent applied for. • 5. Nicholas, M. G. and Milner, D. R., Br. Weld. J., 1961, 8, 375. • 6. Helmi, A. and Alexander, J.M., J. Iron Steel Inst., 1968, 206, 1110. • 7. Metals Handbook, 9th edn, Vol. 2. American Society for Metals, Metals Park, OH, 1979, pp. 65-66. • 8. Sakai, T., Saito, Y., Hirano, K. and Kato, K., Trans. ISIJ, 1988, 28, 1028. • 9. Saito, Y., Tsuji, N., Utsunomiya, H., Sakai, T. and Hong, R. G., Scripta mater., 1998, 39, 1221. • 10. Tylecote, R. F., The Solid Phase Welding of Metals. Edward Arnold, London, 1968.

  6. Model • Principle • Rolling bond surfaces together • Refines microstructure • Improves properties. • Iterative process • Process design steps • Surface treatment • Stacking • Roll bonding (heating) • Cutting

  7. Model • Important parameters: t, tn, n, ε, rt • For reduction of 50% in a pass • Thickness after n cycles • t = t0 / 2n • Total reduction after n cycles • rt = 1 – t / t0 = 1 – 1 / 2n • Equivalent plastic strain

  8. Design Application

  9. Experimental Procedure • No “special” equipment needed! • Three alloys chosen • Al 1100 (commercially pure) • Al 5083 (Al-Mg alloy) • Ti-added interstitial free (IF) steel • Surfaces degreased, brushed • Strips were heated • 50 % reduction rolling under dry conditions

  10. Experimental Procedure

  11. Results

  12. Results • Expected that grain refinement: • Improves mechanical properties related to strength • Decreased % elongation in direction of roll-bonding • The number of cycles required to obtain peak strength can only be determined experimentally

  13. Results

  14. Conclusions • Practical industrial use for high strength structural applications • Advances rolling technology by application to a specific materials processing method • Industries most impacted: construction, marine, aerospace, automotive

  15. Questions???

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