Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지

Evaluation of Resistance Spot Weld Interfacial Fractures in Tensile-Shear Tests of TRIP 590 Steels

저항 점 용접된 TRIP590강의 계면파단특성에 관한 평가

  • Park, Sang-Soon (Dept. of Advanced Material Engineering, Dong-eui University) ;
  • Lee, Sang-Min (Dept. of Advanced Material Engineering, Dong-eui University) ;
  • Cho, Yongjoon (Fundamental Engineering Development Team, Hyundai Motor Company) ;
  • Kang, Nam-Hyun (Division of Materials Science and Engineering, Pusan National University) ;
  • Yu, Ji-Hun (Dept. of Powder Materials Research, Korea Institute of Materials Science) ;
  • Kim, Young-Seok (Division for Dongnam Area Technology Service, Korea Institute of Industrial Technology) ;
  • Park, Yeong-Do (Dept. of Advanced Material Engineering, Dong-eui University)
  • 박상순 (동의대학교 신소재공학과) ;
  • 이상민 (동의대학교 신소재공학과) ;
  • 조용준 (현대자동차 요소생기개발팀) ;
  • 강남현 (부산대학교 재료공학부) ;
  • 유지훈 (한국기계연구원 부설 재료연구소 분말재료연구부) ;
  • 김영석 (한국생산기술연구원 동남권 기술지원본부) ;
  • 박영도 (동의대학교 신소재공학과)
  • Received : 2008.07.01
  • Published : 2008.10.25
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Abstract

The resistance spot welding of TRIP590 steels was investigated to enhance understanding of weld fracture during tensile-shear strength (TSS) test. The main failure modes for spot welds of TRIP590 steels were nugget pullout and interfacial fracture. The peak load to cause a weld interfacial failure was found to be related to fracture toughness of the weld and the weld diameter. Although interfacial fracture occurred in the samples, the load carrying capacity of the weld was high and not significantly affected by the fracture mode. Substantial part of the weld exhibits the characteristic dimple (or elongated dimple) fractures on interfacial fractured surface, in spite of the high hardness values associated with the martensite microstructures. The high load-bearing ability of the weld is directly associated with the area of ductile fracture occurred in weld. Therefore, the judgment of the quality of resistance spot welds in TRIP590 steels, the load carrying capacity of the weld should be considered as an important factor than fracture mode.

Keywords

References

  1. D. B. Im, C. G. Lee, B. H. Song, S. J. Kim, I. M. Park, J. Kor. Inst. Met. & Mater. 38, 1334 (2000).
  2. B. Yan, H. Zhu and SH. Lalam, SAE technical paper series. 1, 0511 (2004).
  3. Yuh J. Chao, J. Mater. Eng. 125, 125 (2003). https://doi.org/10.1115/1.1555648
  4. T. B. Hilditch, J. G. Speer and D. K. Matlock, Materials & Design. 28, 2566 (2007). https://doi.org/10.1016/j.matdes.2006.10.019
  5. Marcio Milititsky and Eric Pakalnines, SAE technical paper series. 1, 0520 (2003).
  6. B Girvin, W Peterson, J Gould, American Iron and Steel Institute. 27, A10-A17 (2007).
  7. D. J. Radakovic and M. Tumuluru, American Welding Journal. 87, 96 (2008).
  8. Xin Sun, Elizabeth V. Stephens, Mohammad A.Khaleel, Engineering Failure analysis. 15, 356 (2008). https://doi.org/10.1016/j.engfailanal.2007.01.018
  9. M. Marya and X. Q. Gayden, American Welding Journal. 84, 172 (2005).
  10. K. C. Kim, J. H. Cha, H. S. Park, J. Mater. Res. 14-4, 239 (2004).