Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Corrosion-Resistant High Strength S20C Element Riveted Al5052-SPFC980Y Steel Joints by Resistance Element Spot Welding

S20C 리벳된 Al5052와 SPFC980Y 강철 resistance-element 점용접 접합부의 미세조직 발달 및 고강도-부식 저항 특성

  • Baek, Seung-Yeop (Multi-Material Research Center, Korea Automotive Technology Institute) ;
  • Song, Jong-Ho (Multi-Material Research Center, Korea Automotive Technology Institute) ;
  • Park, Seung-Youn (Multi-Material Research Center, Korea Automotive Technology Institute) ;
  • Song, Il-Jong (HyunDai Hi-Tec Ind. Co. Ltd.) ;
  • Lee, Hyun-Chul (Multi-Material Research Center, Korea Automotive Technology Institute)
  • 백승엽 (한국자동차연구원 소재융합연구센터) ;
  • 송종호 (한국자동차연구원 소재융합연구센터) ;
  • 박승연 (한국자동차연구원 소재융합연구센터) ;
  • 송일종 ((주)현대하이텍 기술연구소) ;
  • 이현철 (한국자동차연구원 소재융합연구센터)
  • Received : 2020.12.01
  • Accepted : 2021.02.05
  • Published : 2021.02.28
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Abstract

This study examined the mechanical strength and corrosion resistance of a dissimilar joint with an aluminum alloy and steel by resistance element spot welding. SPFC980 steels and Al5052 alloys were applied as the base materials. S20C steels were assembled on Al5052 for the riveting element before the electric resistance welding process. The SPFC980-S20C riveted Al5052 was welded at a 6.5 kA current and 250 kgf/㎠. As a result, the engraved S20C elements formed unstable nuggets after the spot welding processes. In contrast, in the embossed S20C elements, exceptional mechanical properties, such as robust corrosion resistance and fatigue resistance, were obtained by structurally sound joints. The correlation between the microstructure and mechanical properties were examined by microstructural investigations and FEM simulations. The corrosion reliability of element spot-welded SPFC980-Al5052 dissimilar joints was investigated systematically.

이 연구는 electric resistance element spot welding 프로세스를 도입하여 알루미늄 합금-강철의 이종 접합부의 기계적 강도 및 내식성을 향상시키기 위해 수행되었다. SPFC980Y 강철과 Al5052-H32가 각각 모재로써 적용되었고, S20C 강철은 리벳 element로써 음각과 양각의 형상으로 구분되며, Al5052-H32에 전기 저항 스폿 용접을 위해 리벳팅 되어 6.5 kA의 전류와 250 kgf/㎠의 가압력으로 접합되었다. 그 결과, 음각된 S20C element는 스폿 용접 공정 후 불안정한 너깃이 형성되는 반면, 양각된 S20C의 경우, 구조적으로 건전한 접합부로 건전한 내식성 및 탁월한 기계적 특성이 얻어졌다. FEM 시뮬레이션의 도입으로, 음각과 양각의 계면의 접합 특성이 수치적으로 밝혀졌으며, 시뮬레이션 결과는 미세조직 발달 양상을 수치적으로 뒷받침하였다. 이 연구는 element 스폿 용접된 H32-A5052 이종 접합부의 기계적 강도 및 부식 신뢰성에 대해 체계적으로 분석되었으며, 이 공정은 금속재료뿐만 아니라, 경량 비전도성 비철/비금속계 재료에도 적용 될 수 있기 때문에, 차세대 차체 경량화의 양산 기술로 확장 될 수 있다.

Keywords

References

  1. R.K. SIDHU, O.A. OJO, and M.C. CHATURVEDI, "Microstructural analysis of laser-beam-welded directionally solidified INCONEL 738", Metallurgical and Materials Transactions A, Vol.38, No.4, pp.858-870, April. 2007. DOI: https://doi.org/10.1007/s11661-006-9063-8
  2. K. H. Song, Y. D. Chung, K.Nakata, "Investigation of microstructure and mechanical properties of friction stir lap jointed Monel 400 and Inconel 600", Met Mater Int, Vol.19, No.3, pp.571-576, May. 2013. DOI: https://doi.org/10.1007/s12540-013-3027-5
  3. H. Springer, A. Kostka, E.J. Payton, D. Raabe, A. Kaysser-Pyzalla et al., "On the formation and growth of intermetallic phases during interdiffusion between low-carbon steel and aluminium alloys", ACTA MATERIALIA, Vol.59, No.4, pp.1586-1600, May. 2010. DOI: https://doi.org/10.1016/j.actamat.2010.11.023
  4. H. Dehahanpour Baruj, A. Shadkam, M. Kazeminezhad, "Effect of severe plastic deformation on evolution of intermetallic layer and mechanical properties of cold roll bonded Al-Steel bilayer sheets", J MATER RES TECHNOL, Vol.9, No.5, pp.11497-11508, Aug. 2020. DOI: https://doi.org/10.1016/j.jmrt.2020.08.033
  5. Sigler DR, Carlson BE, Janiak P, "Improving aluminum resistance spot welding in automotive structures", Welding Jounal, pp.64-72, June. 2013.
  6. Chen J, Feng Z, Wang HP, Carlson BE, Brown T et al., "Multi-scale mechanical modeling of Al-steel resistance spot welds", Material Science and engineering A, Vol.735, pp.145-153, Aug, 2018. DOI: https://doi.org/10.1016/j.msea.2018.08.039
  7. Lu Y, Mayton E, Song H, Kimchi M, Zhang W, "Dissimilar metal joining of aluminum to steel by ultrasonic plus resistance spot welding - Microstructure and mechanical properties", Materials and Design, Vol.165, January. 2019. DOI: https://doi.org/10.1016/j.matdes.2019.107585
  8. A. Laurino, E. Andrieu, J.-P. Harouard, G.Odemer, J.-C. Salabura et al., "Effect of corrosion on the fatigue life and fracture mechanisms of 6101 aluminum alloy wires for car manufacturing applications", Materials and Design, Vol.53, pp.236-249, January. 2014. DOI: https://doi.org/10.1016/j.matdes.2013.06.079
  9. A A. Saeed, Zulfiqar A, Khan, M.H. Nazir, "Time dependent surface corrosion analysis and modelling of automotive steel under a simplistic model of variations in environmental parameters", Materials Chemistry and Physics, Vol.178, pp.65-73, Aug. 2016. DOI: https://dx.doi.org/10.1016/j.matchemphys.2016.04.068
  10. Mishra RS, Ma ZY, "Friction stir welding and processing" Materials Science Engineering R Reports, vol.50, pp.1-78, Aug, 2005. DOI: https://doi.org/10.1016/j.mser.2005.07.001
  11. Murr LE, Handbook of materials structures, properties, processing and performance, 2015. DOI: https://doi.org/10.1007/978-3-319-01815-7
  12. Das T, Das R, Paul J, "Resistance spot welding of dissimilar AISI-1008 steel/Al-1100 alloy lap joints with a graphene interlayer", Jounal of Manufacturing Process, Vol.53, pp.260-274, Feb. 2020. DOI: https://doi.org/10.1016/j.jmapro.2020.02.032
  13. Azhari-Saray H, Sarkari-Khorrami M, Nademi-Babahadi A, Kashani-Bozorg SF, "Dissimilar resistance spot welding of 6061-T6 aluminum alloy/St-12 carbon steel using a high entropy alloy interlaye", Intermetallics, Vol.124, June. 2020. DOI: https://doi.org/10.1016/j.intermet.2020.106876
  14. Yamagishi H, "High-productivity and high-strength Fe/Al dissimilar metal joining by spot forge welding", Materials Letters, Vol.278, July. 2020. DOI: https://doi.org/10.1016/j.matlet.2020.128412
  15. Zedan MJ, Doos QM, "New Method of Resistance Spot Welding for Dissimilar 1008 Low Carbon Steel-5052 Aluminum Alloy", Procedia Structual Integrity, Vol.9, pp.37-46, 2018. DOI: https://doi.org/10.1016/j.prostr.2018.06.008
  16. Chen C, Kong L, Wang M, Haselhuhn AS, Sigler DR et al., "The robustness of Al-steel resistance spot welding process", Jounal of Manufacturing Processes, Vol.43, pp.300-310, Feb. 2019. DOI: https://doi.org/10.1016/j.jmapro.2019.02.030
  17. Deng S, Yuan R, Tang X, Lu F, "Migration behavior of IMC layer in twin-spot laser welding-brazing of aluminum to steel", Materials and Design, Vol.188, January. 2020. DOI: https://doi.org/10.1016/j.matdes.2020.108489