DOI QR코드

DOI QR Code

Microstructure and Tensile Strength Property of Arc Brazed DP steel using Cu-Sn Insert Metal

Cu-Sn 삽입금속을 이용한 DP강의 아크 브레이징 접합부의 미세조직과 인장특성

  • Cho, Wook-Je (B&G steel, Advanced Material Reserch Team) ;
  • Cho, Young-Ho (Hyundai Heavy Ind., Industrial Research Institute /R&D Division) ;
  • Yun, Jung-Gil (Dept. of Material Science and Engineering, Pusan National University) ;
  • Kang, Chung-Yun (Dept. of Material Science and Engineering, Pusan National University)
  • 조욱제 (B&G steel(주) 기술관리부 연구개발팀) ;
  • 조영호 (현대중공업(주) 생산기술연구소) ;
  • 윤중길 (부산대학교 재료 공학부) ;
  • 강정윤 (부산대학교 재료 공학부)
  • Received : 2013.01.28
  • Accepted : 2013.02.28
  • Published : 2013.02.28

Abstract

The following results were obtained, microstructures and tensile properties in arc brazed joints of DP(dual phase) steel using Cu-5.3wt%Sn insert metal was investigated as function of brazing current. 1) The Fusion Zone was composed of ${\alpha}Fe+{\gamma}Cu$ and Cu23Sn2. The reason for the formation of these solid solutions. Despite, Fe & Cu were impossible to solid solution at room temperature. It's melting & reaction to something of insert metal & Base Metal (DP Steel) by Arc. Brazing Process has faster cooling rate then Cast Process, Supersaturated solid solution at room temperature. 2) The increase Hardness of Fusion Zone was directly proportional to the rise of welding current. Because, ${\alpha}Fe+{\gamma}Cu$ phase (higher hardness than the Cu23Sn2.(104.1Hv < 271.9Hv)) Volume fraction was Growth, due to increasing the amount of base metal melting by High current. 3) The results of tensile shear test by Brazing, All specimens happen to fracture in Fusion Zone. On the other hand, when Brazing Current increasing tend to rise tensile load. but it was very small, about 26-30% of the base metal. 4) The result of fracture analysis, The crack initiate at Triple Point for meet to Upper B.M/Under B.M/Fusion Zone. This Crack propagated to Fusion zone. So ruptured by tensile strength. The Reason to in the fusion zone fracture, Fusion zone by Brazing of hardness (strength) was very lower then the base metal (DP steel). In addition the Fusion Zone's thickness in triple point was thin than the base metal's thickness in triple point.

Keywords

References

  1. Y. Sakuma, O. Matsumura and H. Takechi : Metall. Mater. Trans. A, 22A, 1991, 489
  2. D. B. Im, C. G. Lee, S. J. Kim and I. M. Park : J. Kor. Ins. of Met. & Mater., 38(2000), 3
  3. QYOU.X, JIANG.Z, LI.H, "Ultra-Pure Ferritic Stainless Steels-Grade, Refining, Operation, and Application", Journal of Iron and Steel Research, International, 14-4(2007), 24 https://doi.org/10.1016/S1006-706X(07)60053-3
  4. J.K.Kim, Y.H.Kim, S.H.Uhm, J.S.Lee, K.Y.Kim, "Intergranular corrosion of Ti-stabilized 11wt% Cr ferritic stainless steel for automotive exhaust systems", Corrosion Science (2009), 2716
  5. E. Taban, E. Deleu, A. Dhooge, E. Kaluc, "Laser welding of modified 12% Cr stainless steel : Strength, fatigue, toughness, microstructure and corrosion properties", Materials and Design (2009), 1193
  6. 대한용접.접합학회 "용접.접합편람", Vol.3, pp.172, 2007
  7. C. Chovet, S. Guiheux, "Possibilities offered by MIG and TIG brazing of galvanized ultra high strength steels for automotive applications", la metallurgla Itallana, Vol. 7(2006), 47-54
  8. D. Iordachescu, L. Quintino, R. Miranda, G. Pimenta, "Influence of shielding gases and process parameters on metal transfer and bead shape in MIG brazed joints of the thin zinc coated steel plates", Materials and Design, Vol. 27(2006), 381-390 https://doi.org/10.1016/j.matdes.2004.11.010
  9. D. Iordachescu, L. Quintino, R. Miranda, G. Pimenta, Materials and Design 27, 2006
  10. A.S. GUIMARAES, M.T. MENDES, H.R.M. COSTA, N.K. KUROMOTO, Welding International, 2007
  11. LI Li-qun, FENG Xiao-song, CHEN Yan-bin, Transaction of Nonferrous Metals society of China 18, 2008
  12. H.T. Zhang a, J.C. Feng, P. He, H. Hackl, Materials Characterization 58, 2007
  13. M.B. Kim, S.J. Kim, B.K. Lee, X.Yuan, B.H. Yoon, I.S. Woo and C.Y. Kang, Kor. J. Met. Mater., 48-4(2010)
  14. J. Vinas, L. Kascak, M. Abel, D. Draganovska and M. Gatial, Lebanese Science Journal, 11-2(2010)
  15. A. Joseph, C. Webb, M. Haramia, and D. Yapp, 56th IIW International Conference, Bucharest, Romania, 2003