Thermoelectric Power Measurements on Duplex Stainless Steel Weldments
In our research bead-on-plate autogenous TIG welds were prepared on 2 mm thick UNS S32205 (EN 1.4462) duplex stainless steel sheets using different shielding gases: argon, and argon+nitrogen shielding with +2 vol. % N2, +5 vol. % N2 and +10 vol. % N2 nitrogen content beside argon. The welds were reheated in argon atmosphere up to 1250 °C peak temperature, using Gleeble® 1500 thermomechanical simulator. Both in the as-welded and reheated state the austenite fraction, total nitrogen content and thermoelectric power (TEP) values were measured. Correlation was found between the austenite content in the weld metal, the total nitrogen content in the wed metal and the TEP value as a function of the used shielding gases and the subsequent reheating thermal cycle. We also attempted to differentiate between the total dissolved nitrogen and interstitial atomic nitrogen. This work is a part of an extended project in order to understand the sometimes controversial effects of nitrogen on duplex stainless steel welding.
KeywordsDuplex stainless steel Nitrogen in shielding gas Thermoelectric power
This paper has been supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences grant number: BO/00196/16/6 and by the National Research, Development and Innovation Office - NKFIH, OTKA PD 120865 (K. Májlinger).
- 2.Kalácska, E., Májlinger, K., Varbai, B.: Gas tungsten arc welding of different high strength austenitic stainless steel grades. In: YPIC 2017: 3rd Young Welding Professionals International Conference, pp. 20–26, 120 p. (2017)Google Scholar
- 7.Balogh, A., Török, I., Gáspár, M., Juhász, D.: Present state and future of advanced high strength steels. Prod. Process. Syst. 5, 79–90 (2012)Google Scholar
- 8.ASTM A262-15 standard practices for detecting susceptibility to intergranular corrosion in austenitic stainless steels (2015)Google Scholar
- 9.Toit, M., Pistorius, P.: Nitrogen control during autogenous arc welding of stainless steel- part 1: experimental observations. Weld. J. 47, 219–224 (2003)Google Scholar
- 13.Westin, E.: Microstructure and properties of welds in the lean duplex stainless steel LDX 2101 (2010)Google Scholar
- 22.Damian, J.K.: Some pitfalls in welding of duplex stainless steels. Soldag. Inspeção. 15, 336–343 (2010)Google Scholar
- 32.Pettersson, R., Johansson, M., Westin, E.M.: Corrosion performance of welds in duplex, superduplex and lean duplex stainless steels corrosion performance of welds in duplex, superduplex and lean duplex stainless steels. Corros. Manag. Appl. Eng. 1, 1–8 (2014)Google Scholar
- 34.Kleber, X., Verdu, C., Cazottes, S., Dobranszky, J., Ginsztler, J., Cedex, V.: Aging behaviour of lean duplex steel using thermoelectric power measurements. In: 8th Duplex Stainl. Steels Conference 2101 (2010)Google Scholar