Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Heat Treatment Effect on Pitting Corrosion of Super Duplex Stainless Steel UNS S32750 FCA Welds

슈퍼 듀플렉스 스테인리스강 UNS S32750의 FCA 용접 후 열처리가 공식에 미치는 영향

  • Jang, Bok-Su (Jeong-woo Industrial Machine Co., Ltd.) ;
  • Moon, In-June (School of Energy.Materials.Chemical, Korea University of Technology and Education) ;
  • Kim, Se-Cheol (School of Energy.Materials.Chemical, Korea University of Technology and Education) ;
  • Koh, Jin-Hyun (School of Energy.Materials.Chemical, Korea University of Technology and Education)
  • 장복수 (정우산기(주)) ;
  • 문인준 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 김세철 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 고진현 (한국기술교육대학교 에너지.신소재.화학공학부)
  • Received : 2013.05.12
  • Accepted : 2013.09.16
  • Published : 2013.10.31
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Abstract

This study was carried out to investigate the influence of a sigma phase precipitation on the pitting corrosion resistance and microstructural change of super duplex stainless steels(UNS S32750). The welds made by FCAW (Flux Cored Arc Welding) were heat treated ($930^{\circ}C$, $1080^{\circ}C$, $1230^{\circ}C$) and quenched. Based on the microstructural examination, it was found that the ${\sigma}$ phase was formed in base metals and welds heat treated at $930^{\circ}C$ while there were little ${\sigma}$phases formed in base metals and weld metal experienced the relatively fast cooling from $1080^{\circ}C$ and $1230^{\circ}C$. On the other hand, the most weight loss due to pitting corrosion occurred in base and weld metals heat treated at $930^{\circ}C$. It was confirmed that the pitting corrosion occurred in the phase boundaries of ferrite/sigma and austenite/sigma. The pitting corrosion resistance decreased owing to an increase in Cr, Mo depleted areas adjacent to the intermetallic phases such as ${\sigma}$phases. The hardness was greatly increased due to the precipitation ${\sigma}$phases.

Keywords

References

  1. P. Guha and C. A. Clark: "Properties and Application of Chromium Duplex Stainless Steels", Int. Conf. Proc. of Duplex Stainless Steels, 355-368, 1983 in korea
  2. G. Herbsleb and P.Schwaab, "Precipitation of Intermetallic Compounds, Nitrides and Carbides in AF 22 Duplex Steel and Their Influence on Corrosion Behavior in Acids", Int. Conf. Proc. of Duplex Stainless Steels, 15-38, 1983
  3. Hyo-Jong Kim and Sung-Keun Lee, "Low Temeprature Impact Toughness and Stress Corrosion Resistance in Duplex Stainless Steel Welds", Journal of Korean Society of Coastal and Ocean Engineers 17('95.6) 152-160
  4. Jong-Sub Lee and Sook Hwan Kim, A Study of Weld Fusion Zone Phenomena in Austenitic Stainless Steels(2) - Effect of Nitrogen on Microstructural Evolution and Hot Cracking Susceptibility of GTA Welds in STS 304 -, 18-1(2000), 59-69
  5. Chon-Ho Jee, Jun-Tae Choi and Dae-Soon Kim, Study on the optimum hot forming temperature and solution heat treatment temperature for the super duplex stainless steel weld, Journal of KWJS (2006), 137-139 in korea
  6. Charles J. Super duplex stainless steels: structure and properties. In: Charles J, Bernhardsson S, editors. Duplex Stainless Steels 91: Proceedings of the Third Internationl a Conference on Duplex Stainless steels, vol. 1. 3-48 Les editions de physique. (1991)
  7. H. D. Solomon and T. M. Devine, Proc. Conf. on Duplex Stainless Steels, (ed: R. A. Lula), p.693, ASTM, Metal Park, Ohil, USA (1983)
  8. J. Charles, Proc. Conf. on Duplex Stainless Steels, (eds: J. Charles and S. Bernhardsson), p.3, Beaune, France (1991)
  9. Seong-Kil Nam, Se-Jin Park, Hye-Sung Na and Chung-Yun Kang, Effect of Thermal Cycle on Microstructure and Pitting Corrosion Property of Multi-pass Weldment of Super-duplex Stainless Steel in korea
  10. K. Johansson, Pro. Conf. on Duplex Stainless Steels, (eds: J. Charles and S. Bernhardsson), p.13, Associazione Italiana Metallurgia, Venezia, Italy (2000)
  11. J.-O. Nilsson : "Super duplex stainless steels", Matereals Science and Technology, August 1992 Vol. 8, 685- 700 https://doi.org/10.1179/mst.1992.8.8.685
  12. Soon-Hyeok Jeon, Soon-Tae Kim, In-sung Lee, Ji-Soo, Kim, Kwang-Tae Kim and yong-Soo Park: "Effect of Aging Time on Resistance to Localized Corrosion of Hyper Duplex Stainless Steel, Corrosion Science and Technology, 9-5 (2010), 209-215 in korea
  13. ASTM G48-03, "Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution", West Conshohocken, PA: ASTM, 2007
  14. 대한용접․접합학회, "I철강 및 비철재료", 용접․접합 편람 (2008), 152, in korea
  15. T.G.GOOCH: "Corrosion Behavior of Welded Stainless Steel", Supplement To The Welding Journal, May 1996, 135s-154s in korea
  16. Yong-Soo Park, Soon-Tae Kim, In-Sung Lee and Chi-bok Shong: "Effects of Rare Earth Metals Addition and aging Treatment on the Corrosion Resistance and Mechanical Properties of Super Duplex Stainless Steels", METALS AND METERIALS International, 8-3(2002), 309-318 in korea https://doi.org/10.1007/BF03186101
  17. Gi-Hyoun Kwon, Young-Sang Na, Wee-Do Yoo, Jong-Hoon Lee and Yong-Ho Park, Effects of the Cooling Rate after Annealing Treatment on the Microstructure and the Mechanical properties of Super-Duplex Stainless Steel, Korean J. Met. Mater. 50-10, 735-743 in korea
  18. Chan-Jin Park, Hyuk-sang Kwon, and Hee-San Kim: "Effects of Sigma ($\sigma$) Phase on the Pitting Corrosion of 25% Cr Duplex stainless Steel; Investigations by means of Electrochemical Noise Measurement, Corrosion Science And Technology, 2-1(2003), 18-25 in korea

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  1. Variation of Mechanical Properties and Corrosion Properties with Mo Contents of Hyper Duplex Stainless-Steel Welds pp.2005-4149, 2018, https://doi.org/10.1007/s12540-018-0166-8