Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Comparison of Tensile and Impact Properties of Hypo-Eutectoid Steels Containing Micro-Alloying Elements

미량합금 원소가 첨가된 아공석강의 인장 및 충격 특성 비교

  • Lee, Seung-Yong (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Cho, Yun (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Hwang, Byoungchul (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 이승용 (서울과학기술대학교 신소재공학과) ;
  • 조윤 (서울과학기술대학교 신소재공학과) ;
  • 황병철 (서울과학기술대학교 신소재공학과)
  • Received : 2016.12.08
  • Accepted : 2016.12.29
  • Published : 2017.01.30
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Abstract

In this study tensile and impact properties of three hypo-eutectoid steels containing different micro-alloying elements were investigated in terms of microstructural factors such as pro-eutectoid ferrite grain size, pearlite fraction, interlamellar spacing, and cementite thickness. Yield point phenomenon appeared in all the steel specimens during tensile testing, and ultimate tensile stress was mainly dependent on pearlite fraction. On the other hand, the refinement of austenite grain size caused by the addition of micro-alloying elements resulted in the increment of ferrite volume fraction and carbon contents in pearlite because of the refinement of pro-eutectoid ferrite grain size. As a result, cementite thickness in pearlite increased and had an effect on deteriorating the low temperature impact toughness.

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References

  1. T. Gladman : The physical metallurgy of microalloyed steels, Maney Pub. (1997).
  2. L. Shi, Z. Yan, Y. Liu, X. Yang, X. Qiao, B. Ning and H. Li : Met. Mater. Int., 20(1) (2014) 19. https://doi.org/10.1007/s12540-014-1006-0
  3. M. Kang, H. Kim, S. Lee and S. Y. Shin : Met. Mater. Int., 21(4) (2015) 628. https://doi.org/10.1007/s12540-015-4607-3
  4. R. Shukla, S. K. Ghost, D. Chakrabarti and S. Chatterjee : Met. Mater. Int., 21(1) (2015) 85. https://doi.org/10.1007/s12540-015-1010-z
  5. I. Tamura, H. Sekine and T. Tanaka : Thermomechanical processing of high-strength low-alloy steels, Butterworth-Heinemann (2013).
  6. T. Gladman, D. Dulieu and I. D. McIvor : in Proc. Conf. on Microalloying 75 (1977).
  7. E. O. Hall : Yield point phenomena in metals and alloys, Springer Science & Business Media (2012).
  8. F. R. N. Nabarro and J. P. Hirth : Dislocation in solids (Vol. 13), Elsevier (2007).
  9. W. G. Jhonston : J. Appl. Phys., 33 (1962) 2716. https://doi.org/10.1063/1.1702538
  10. D. Hull and D. J. Bacon : Introduction to dislocations, Butterworth-Heinemann (2013).
  11. B. E. Q'Donnelly, R. L. Reuben and T. N. Baker : Met. Technol., 11 (1984) 45. https://doi.org/10.1179/030716984803274837
  12. R. E. Smallman and A. H. W. Ngan : Modern physical metallurgy, Elsevier (2014).
  13. K. Kunishige, T. Hashimoto and T. Yukitoshi : Tetsu-to-Hagane, 66 (1980) 63. https://doi.org/10.2355/tetsutohagane1955.66.1_63
  14. T. Gladman, I. D. McIvor and F. B. Pickering : J. Iron Steel Inst., 210 (1972) 916.
  15. F. Fang, Y. Zhao, P. Liu, L. Zhou, X. Hu, X. Zhou and Z. H. Xie : Mater. Sci. Eng. A, 608 (2014) 11. https://doi.org/10.1016/j.msea.2014.04.050