DOI QR코드

DOI QR Code

High-Strain-Rate Deformation of Fe-6.5wt.%Si Alloys using a Split Hopkinson Pressure Bar Technique

홉킨슨 압력봉법을 이용한 Fe-6.5wt.%Si 합금의 고변형률속도 거동

  • Yoon, Young-Ki (Dept.of Mechanical Engineering, Graduate School of Chonnam National Universityisy) ;
  • Yoon, Hi-Seak (Dept.of Mechanical Engineering, Chonnam National Universityisy) ;
  • Umakoshi, Yukichi (Osaka University) ;
  • Yasuda, Hiroyuki Y. (Osaka University)
  • 윤영기 (전남대학교 대학원 기계공학과) ;
  • 윤희석 (전남대학교 기계공학과) ;
  • ;
  • Published : 2001.07.01

Abstract

Many researches have published numerous papers about the high-strain-rate obtained from Split Hopkinson Pressure Bar(SHPB) tests. And 6.5wt%Si steel is widely known as an excellent magnetic material because its magnetostriction is nearly zero. Single crystals are prepared by the Floating Zone(FZ) method, which melts the alloy by the use of a high temperature electron beam in a pure argon gas condition. In this paper, the fracture behavior of the poly crystals and single crystals (DO$_3$phase) of Fe-6.5wt%Si alloy by SHPB test is observed. The comparison of high-strain-rate results with static results was done. Obtained main results are as follows: (1) Fe-6.5wt%Si alloy has higher strength at high-strain-rate tensile. SHPB results of polycrystal are twice as high as static results. (2) From the fractography, the cleavage steps are remarkably reduced in the SHPB test compared with the static test.

Keywords

Split Hopkinson Pressure Bar;Fe-6.5wt%Si;Floating Zone Method;Polycrystal;Single Crystal;Fractography

References

  1. Pittinato, G. F., Kerlins, V., Phillips, A., and Russo, M. A., 1975, 'SEM/TEM Fractography Handbook,' pp. 25-57, Metals and Ceramics Information Center, USA
  2. 小寺澤 良一, 1982, '金屬 破斷面 寫眞集,' pp. 503-505, テクノアイ, 東京
  3. Cai, B. C., Dasgupta, A., and Chou, Y. T., 1982, 'A New Technique for The Growth of Bicrystals of Refractory Metals,' J. Crystals Growth, Vol. 86, pp. 145-151 https://doi.org/10.1016/0022-5088(82)90199-0
  4. Glebovsky, V. G., Moskvin, S. I., and Semenov, V. N., 1982, 'Growing Techniques and Structure of Niobium Bicrystals,' J. Crystal Growth, Vol. 59, pp. 450-454 https://doi.org/10.1016/0022-0248(82)90366-9
  5. Semenov, V. N., Staumal, B. B., Glebovsky, V. G. and Gust, W., 1995, 'Preparation of Fe-Si Single crystals and Bicrystals for Diffusion Experiments by the Electron Beam Floating Zone Technique,' J. Crystals Growth, Vol. 151, pp. 180-186 https://doi.org/10.1016/0022-0248(95)00034-8
  6. Kadeckova, S. and sestak, B., 1963, 'Stabilization of Floating Liquid Zone in Preparation of Fe-Si Alloy Single Crystals,' Brit. J. Appl. Phys., Vol. 14. pp. 927-928 https://doi.org/10.1088/0508-3443/14/12/327
  7. Kolsky, H., 1949, 'An Investigation of the Mechanical Properties of Materials at Very High Rates of Loading,' Proceedings of the Physical Society, B, Vol. 62, pp.676-701 https://doi.org/10.1088/0370-1301/62/11/302
  8. Hopkinson, B., 1914, 'A Method of Measuring the Pressure Produced in the Detonation of Explosives or by the Impact of Bullets,' Phil. Trans. A, Vol. 213, p. 437
  9. Arai, K. I., Tsuya, N. and Ohmori, K., 1981, 'Annealing of Silicon-Iron Ribbons Containing Around 6.5wt% Silicon,' IEEE Trans. Magn, Vol. MAG-17, No. 6, pp. 3154-3156
  10. Tanaka, Y., Takada, Y., Abe, M., and Masuda, S., 1987, 'Magnetic Properties of 6.5% Si-Fe Sheet and Its Applications,' J. Magn. Magn. Mater., Vol. 83, pp. 375-376 https://doi.org/10.1016/0304-8853(90)90553-3
  11. Ninomiya, H., Tanaka, Y., Hiura, A., and Takada, Y., 1991, 'Magnetostriction and Applications of 6.5%Si Steel Sheet,' J.Appl.Phys. Vol. 69, No. 8, pp. 5358-5360 https://doi.org/10.1063/1.348028
  12. Kenji Narita and Masato Enokizono, 1979, 'Effect of Ordering on Magnetic properties of 6.5-Percent Silicon-Iron Alloy, IEEE Trans. Magn., Vol. MAG-15, No. 1. pp. 911-915
  13. 윤영기, 윤희석, 홍성길, 2000, 'Fe-6.5wt%Si 합금의 역학 특성에 미치는 어닐링 효과,' 대한기계학회논문집 A 권, 제 24 권 제 12 호, pp. 2909-2916
  14. 양현모, 민옥기, 2000, 'SHPB 인장 시험에서 알루미늄 함금의 진응력-진변형률 관계,' 대한기계학회논문집 A 권, 제 24 권, 제 8 호, pp. 1917-1922
  15. 이억섭, 김관희, 황시원, 2000, 'SHPB 기법을 이용한 A16061-T6 의 고속 인장 변형 거동 규명,' 대한기계학회논문집 A 권, 제 24 권 제 12 호, pp. 3033-3039