한국주조공학회지 (Journal of Korea Foundry Society)

  • 제32권1호
  • /
  • Pages.32-37
  • /
  • 2012
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  • 1598-706X(pISSN)
  • /
  • 2288-8381(eISSN)
한국주조공학회 (Korea Foundry Society)
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Fe-Co기 고인성 고강도강의 반복 열처리 거동 - Part 1. 조직제어

The Repeat Heat Treatment Behavior of Double Remelted Fe-Co Ultra-high Strength Steel. - Part. 1 Microstructure Control

  • 윤보희 (충남대학교 신소재공학과) ;
  • 박경태 (충남대학교 녹색에너지기술전문대학원) ;
  • 이태혁 (충남대학교 신소재공학과) ;
  • 김재훈 (충남대학교 기계설계공학과) ;
  • 김홍규 (한국국방과학연구소) ;
  • 이성 (한국국방과학연구소) ;
  • 이종현 (충남대학교 녹색에너지기술전문대학원)
  • Yoon, Bo-Hee (Department of advanced material engineering, Chungnam national university) ;
  • Park, Kyoung-Tae (Graduate school of green energy technology, Chungnam national university) ;
  • Lee, Tae-Hyuk (Department of advanced material engineering, Chungnam national university) ;
  • Kim, Jae-Hoon (Department of mechanical engineering design, Chungnam national university) ;
  • Kim, Hong-Kyu (Agency for defense development of Korea) ;
  • Lee, Seong (Agency for defense development of Korea) ;
  • Lee, Jong-Hyeon (Graduate school of green energy technology, Chungnam national university)
  • 투고 : 2011.11.21
  • 심사 : 2012.02.10
  • 발행 : 2012.02.29
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초록

In this study, microstructural evaluation was carried out on secondary hardening type ultrahigh strength steel, Fe-Co-Ni composition. This paper as a first part of whole research presented the microstructural behavior by cyclic heat treatment. The cyclic heat treatment method includes normalizing, stress relieving, solution treatment and aging. Especially, solution treatments performed triple times to get maximized solution hardening. Phase transformation and microstructure were observed by using optical microscope (OM), Electron back-scattered diffraction (EBSD) and X-ray stress analyzer. During the triple solution treatment, size of grain boundary was dramatically decreased by generating a packet from the martensite transformation of residual austenite in the inner part of grain, whereas the hardness increase was not significant.

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참고문헌

  1. Y. Asayama: AISM, "Maraging steels recent development and application", 47 (1988) 295-302
  2. G. Malakondaiah, M. Srinitlas and P. Rama Raot: Progress in Materials Science, "Ultrahigh-Strength low alloy steels with enhanced fracture toughnes", 42 (1997) 209-242 https://doi.org/10.1016/S0079-6425(97)00016-9
  3. Raghavan Ayer, Machmeier: J. Metall. Trans. A, "Transmission electron microscopy examination of hardening and toughening phenomena in Aermetl00", 24A (1993) 1943-1993
  4. J. P. Campbell, K. T. Venkateswara Rao, and R. O. Ritchie: Metal. and Mat. trans. A, "The Effect of Microstructure on Fracture Toughness and Fatigue Crack Growth Behavior in γ- Titanium Aluminide Based Intermetallics", 30A (1999) 563- 577
  5. M. J. Yokota, G. Y. Lai : J. Metall. trans. A, "Toughness of Lath vs Plate Martensites", 6A (1975) 1975-1835
  6. Liu Y. j., Li Y. M., Tan Y. H. and Huang B. Y.: Inter. J. Iron and Steel Research "Apparent Morphologies and Nature of Packet Martensite in High Carbon Steels", 13 (2006) 40-46
  7. James F. Shackelford : Pearson education inc., 6th edition, "Introduction to materials science for engineerings" Chap. 6 (2005) 186-285
  8. S. Morito, M. Saito, T.Ogawa, T.Furuhara and T.Maki : ISIJ Inter, "Effect of austenite grain size on morphology and crystallography of lath martensite in low carbon steels", 45(1) (2005) 91-94 https://doi.org/10.2355/isijinternational.45.91
  9. W. D. Callister : 2nd ed. Wiley & Sons, "Fundamentals of Materials Science and Engineering", 32 (2006) 252-257
  10. Zhao, Z, Zhong, B J.: Aeronaut. Mater. China, "A Study of the Mechanism of Overage Behavior in a Secondary Hardening Steel", 8(2) (1988) 8-13
  11. H. Kwon, C. M. Kim, K. B. Lee, H. R. Yang, and J. H. Lee : J. Metall. Trans. A, "Effects of Co and Ni on Secondary Hardening and Fracture Behavior of Martensitic Steels Bearing W and Cr", 29A (1998) 397-401