Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Assessment of Strength Characteristics of Al 2024 ECAP Metal Using Small Punch Testing

소형펀치 시험법을 이용한 Al 2024 ECAP 재료의 강도특성 평가

  • Published : 2006.01.01
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Abstract

When subjected to severe shear deformation by ECAP, microstructure of Al2024 becomes extremely refined. To measure the strength of that, small punch(SP) testing method was adopted as a substitute for the conventional uniaxial tensile testing because the size of material processed by ECAP were limited to ${\psi}12\;mm$ in transverse direction. SP tests were performed with specimens in longitudinal and transverse directions of Al2024 ECAP metal. For comparing the strength values with those assessed by SP tests, uniaxial tensile tests were also conducted with specimens in longitudinal direction. Failure surfaces of the tested SP specimens showed that failure mode was shear deformation and Al 2024 ECAP metal has an anisotropy in strength. Thus, conventional equations proposed for assessing the strength characteristics were improper to assess those of Al2024 ECAP metal. In this paper a way of assessing the strength of Al 2024 ECAP metal was proposed and was proven to be effective.

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References

  1. Choi, Jeong Woo, 2005, 'A Study on Relation between Grain Size Refinement and Strength by Equal Channel Angular Pressing(ECAP),' MS Thesis, School of Mechanical Engineering, Chung-Ang University
  2. Kang, H. K., Kim, H. W. and Kang, S. B., 2002, 'Influence of Pressing Temperature on the Microstructure and Mechanical Properties of 6061 Al Alloy Processed by Equal Channel Angular Pressing,' Journal of the Korean Institute of Metal & Materials, Vol. 40, No. 2
  3. Ahn, S. H., Nam, K. W., Kim, J. H. and S. Kang, B., 2002, 'Nondestructive Evaluation for Grain Refinement of Aluminum Alloy of Equal-Channel Augular Pressing,' Journal of the Korean Society for Nondestructive Testing, Vol. 22, No. 2, pp. 132-139
  4. Seo, C. W., 1999, 'Microstructure and Mechanical Characteristics of 5083 Al and 0.15%C steel by Equal-Channel Angular Pressing,' ME Thesis, Department of Matalluray and Matelials Engineering, Hanyang University
  5. Ahn, B. D., Cho, H. S., Kim, J. L., Park, K. T. and Shin, D. H., 2004, 'Grain Refinement of Structural Materials by Severe Plastic Deformation' Trends in Metals & Materials Engineering, Vol. 17, No.2
  6. Kang, H. K., Bachelard, L., Kim, H. W. and Kang., S. B., 2001, 'Microstructure and Mechanical Properties of 5083 Aluminum Alloy Processed by Equal Channel Angular Pressing at Elevated Temperature,' Journal of the Korean Institute of Metals & Materials, Vol. 39, No. 5
  7. Patlan, V., Higashi, K., Kitagawa, K., Vinogradov, A. and Kawazoe, M., 2001, 'Cyclic Response of Fine Grain 5056 Al-Mg Alloy Processed by Equal-Channel Angular Pressing,' Material Science and Engineering A319-321, pp. 587-591 https://doi.org/10.1016/S0921-5093(01)01069-3
  8. Iwahashi, Y., Horita, Z., Nemoto, M. and Langdon, T. G, 1997, 'An Investigation of Microstructural Evolution during Equal-Channel Angular Pressing,' Acta Meterialia, Volume 45, Issue 11, Pages4733-4741 https://doi.org/10.1016/S1359-6454(97)00100-6
  9. Wang, Y. Y., Sun, P. L., Kao, P. W. and Chang, C. P., 2004, 'Effect of Deformation Temperature on the Microstructure Developed in Commerical Purity Aluminum Processed by Equal Channel Anglar Extrusion,' Scripta Materialia, Volume 50, Issue 5, pp.613-617 https://doi.org/10.1016/j.scriptamat.2003.11.027
  10. FIPCA ISP 13663-1998-02, 'Characterization of Punch and Bulge Testing of Small Specimens Employing Theoretical, Finite Element and Experimental Methods and a Technical Market Survey'
  11. Mao, X. and Takahashi, H., 1987, 'Development of a Further-Miniaturized Specimen of 3mm Diameter for TEM Disk(${\variphi}$ 3mm) Small Punch Tests,' Journal of Nuclear Materials 150, pp.42-52 https://doi.org/10.1016/0022-3115(87)90092-4
  12. Hankin, G. L., Toloczko, M. B., Hamilton, M. L., Garner, F. A. and Faukner, R. G., 1998, Journal of Nuclear Materials 258A, 1657 https://doi.org/10.1016/S0022-3115(98)00204-9
  13. Leon, C. A. and Drew, R. A. L., 2002, 'Small Punch Testing for Assessing the Tensile Strength of Gradient Al/Ni-SiC Composites,' Materials Letters 56, pp. 812-816 https://doi.org/10.1016/S0167-577X(02)00619-5
  14. Kwon, K. H., Chae, S. W., Kwun, S. I., Kim, M. H. and Kwang, S. K., 2001, 'Effect of Die Deformation and Channel Angle on Deformation Behavior of Meterial During Equal channel Augular Pressing with Pure-Zr,' Transactions of the KSME A, Vol. 25, No. 11, pp.1751-1758
  15. Park, T. G., Ma, Y. W., Jeong, I. S. and Yoon, K. B., 2003, 'A Study on Applicability of SP Creep Testing for Measurement of Creep Properties of Zr-2.5Nb Alloy,' Transactions of the KSME A, Vol. 27, No. 1, pp.94-101 https://doi.org/10.3795/KSME-A.2003.27.1.094
  16. Yoon, K. B., Park, T. G, Shim, S. H. and Jeong. I. S., 2001, 'Assessment of Creep Properties of 9Cr Steel Using Small Punch Creep Testing,' Transactions of the KSME A, Vol. 25, No. 9, pp. 1493-1500
  17. Park, T. G., Shim, S. H., Yoon, K. B. and Jang, C. H., 2002, 'A Study on Parameters Measured during Small Punch Creep Testing,' Transactions of the KSME A, Vol.26, No. 1, pp.171-178 https://doi.org/10.3795/KSME-A.2002.26.1.171
  18. Fluery, E. and Ha, J. S., 1998, 'Small Punch Tests to Estimate the Mechanical Properties of Steels for Steam Power Plant: I. Mechanical Strength,' International Journal of Pressure Vessels and Piping, Vol. 75, pp. 699-706 https://doi.org/10.1016/S0308-0161(98)00074-X
  19. Kim, Young Seok, 2003, 'Theory of Plasticity,' Sigmapress, p. 414