Abstract
In the case of welding for duplex stainless steel, the welds change in the morphology and ferrite/austenite phase ratio due to the welding conditions and the alloy composition of the material itself. Especially when using the laser beam welding what has the ultra-high heat input and rapid cooling, the change in the welds is much pronounced. Therefore, in this study, after etching the welds of the samples with 10% KOH solution, we have observed the microstructure changes of three different duplex stainless steels under different welding conditions. The results of the experiment of duplex stainless steels, super duplex, and lean-alloy duplex showed that the structure of the welds was significantly different between the steel grades; it was found that the increase in welding velocity significantly reduced the formation of the austenite phase. To counterbalance the ratio of ferrite/austenite phase by using the laser surface treatment after welding, it has become possible to promote a part of the content of the austenite phase even in the welds. In addition, these results could become a basis and verification for the simulation of the duplex stainless steels’ welds microstructure in the future.
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References
Ogawa T, Koseki T (1988) Welding technology trend of duplex stainless in oil and gas industry applications. J Jpn Weld Soc 57(2):92–105
Omura T, Kushida T, Komizo Y (2000) Microstructural features and corrosion properties in laser welded duplex stainless steels. Weld Int 14(4):257–260
Todorov RP, Khristov KhG (2004) Widmanstatten structure of carbon steels. Met Sci Heat Treat 46(1):49–53. https://doi.org/10.1023/B:MSAT.0000029601.58461.bd
Yin J, Hillert M, Borgenstam A (2017) Morphology of proeutectoid ferrite. Metall Mater Trans A 48(3):1425–1443. https://doi.org/10.1007/s11661-016-3903-y
Kokawa H, Okada J, Kuwana T (1993) Nitrogen absorption and microstructure of duplex stainless steel weld metal. Weld Int 7(5):384–389
Fukui F (1981) Weldability duplux stainless steel. J Jpn Weld Soc 50(3):235–240. https://doi.org/10.2207/qjjws1943.50.235
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© 2020 The Minerals, Metals & Materials Society
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Xia, Y., Zhang, X., Miyasaka, F., Mori, H. (2020). Effects of Welding Conditions and Post-Weld Heat Treatment on Precipitation of Widmanstätten-Austenite of Duplex Stainless Steels. In: Lee, J., Wagstaff, S., Lambotte, G., Allanore, A., Tesfaye, F. (eds) Materials Processing Fundamentals 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36556-1_19
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DOI: https://doi.org/10.1007/978-3-030-36556-1_19
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