Microstructure and Impact Toughness of Weld Metal in Multipass Welded Super Duplex Stainless Steel

다층용접한 슈퍼 듀플렉스 스테인리스강 용접금속의 조직 및 충격인성

Seo, Won-Chan;Park, Chan;Bang, Kook-Soo

  • Received : 2012.09.03
  • Accepted : 2012.12.11
  • Published : 2012.12.31


The effects of reheating during welding on the microstructure and impact toughness of weld metal in 25% Cr super duplex stainless steels were investigated. Using different heat inputs, weld metals with different reheated regions were obtained. This showed that, depending on the reheating temperature, the microstructure in the reheated region was quite different from that of the as-deposited microstructure. When reheated into the ${\gamma}+{\alpha}$ temperature range, fine intragranular austenite was formed in the as-deposited columnar structure. However, when reheated above the ${\alpha}$ solvus temperature range, most of the columnar structure disappeared and fine equiaxed austenite and ferrite were formed. Because of the larger amount of fine austenite in the reheated region, a higher impact toughness was obtained in the weld metal with a higher amount of reheated region.


Super duplex stainless steel;Weld metal;Toughness;Microstructure


  1. Atamert, S., Reed, R.C., King, J.E., 1991. Modelling of Multipass Duplex Stainless Steel Weld Deposit Microstructures, Proc. Duplex Stainless Steels 91, 1, 393-402.
  2. Atamert, S., King, J.E., Reed, R.C., 1992. Reheated Regions in Duplex Stainless Weldments, Proc. International Trends in Welding Science and Technology, 241-245.
  3. Bonnefois, B., Charles, J., Dupoiron, F., Soulignac, P., 1991. How to Predict Welding Properties of Duplex Stainless Steels?, Proc. Duplex Stainless Steels 91, 1, 347-361.
  4. Calliari, I., Zanesco, M., Ramous, E., 2006. Influence of Isot hermal Aging on Secondary Phases Precipitation and Toughness of a Duplex Stainless Steel SAF 2205, Journal of Materials Science, 41, 7643-7649.
  5. Gooch, T.G., 1983. Weldability of Duplex Ferritic-Austenitic Stainless Steels, Proc. Duplex Stainless Steels, 573-602,
  6. Gooch, T.G., 1991. Corrosion Resistance of Welds in Duplex Stainless Steels, Proc. Duplex Stainless Steels 91, 1, 325-335.
  7. Gunn, R.N., 1997a. Duplex Stainless Steels, Abington publishing, Cambridge, 24.
  8. Gunn, R.N., 1997b. Duplex Stainless Steels, Abington publishing, Cambridge, 135.
  9. Kotecki, D.J., 1997. Ferrite Determination in Stainless Steel Welds - Advances since 1974, Welding Journal, 76, 24s-37s.
  10. Nakade, K., Ohe, K., Kuroda, T., 2001. Precipitation Behavior of ${\sigma}$ Phase for Reheated Duplex Stainless Steel Weld Metal, Journal of the Japan Welding Society, 19(1), 92-99.
  11. Noble, D.N., Gooch, T.G., 1986. Factors Controlling the Ferrite/Austenite Balance in Arc Welded 22Cr/5Ni/2.5 Mo/N Duplex Stainless Steel, The Welding Institute Report. No 321/1986.
  12. Schubert, L.E., Kumar, A.S., Rosinski, S.T., Hamilton, M.L., 1995. Effect of Specimen Size on the Impact Properties of Neutron Irradiated A533B Steel, Journal of Nuclear Materials, 225, 231-237.
  13. Stekly, J.J.K., Scandella, J.-L., Salmon, K.A., 1991. Effects of Welding Techniques on the Properties of Super Duplex Stainless Steels, Proc. Duplex Stainless Steels 91, 1, 431-439.
  14. Zucato, I., Moreira, M.C., Machado, I.F., Lebrao, S.M.G., 2002. Microstructural Characterization and the Effect of Phase Transformations on Toughness of the UNS S31803 Duplex Stainless Steel Aged Treated at $850^{\circ}C$, Materials Research, 5(3), 385-413.