Finite Element Analysis of 2205 Duplex Stainless Steel Welds*

Alptekin Kisasoz; Ahmet Karaaslan

doi:10.3139/120.110633

Article

Finite Element Analysis of 2205 Duplex Stainless Steel Welds*

Alptekin Kisasoz and Ahmet Karaaslan

Published/Copyright: October 11, 2014

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From the journal Materials Testing Volume 56 Issue 10

Abstract

Duplex stainless steels are sensitive to high temperature exposure. The microstructure of the duplex stainless steels changes at high process temperatures. Such microstructural changes might affect the mechanical properties and corrosion resistance of duplex stainless steel. Therefore, the microstructural properties of 2205 duplex stainless steel welds were studied and respective microstructural changes during the welding process have been investigated by finite element analysis before fabrication process. 2205 duplex stainless steels were welded using the TIG process. The heat distribution along the cross section of weldments according to the TIG welding parameters was calculated by finite element analysis using ANSYS software. After metallographic preparation of the weldments, each sample was etched by electro-chemical method and the ferrite-austenite ratio was examined by light microscopy. The finite element analyses and microscopic results were compared and the mechanical properties of the weldments were investigated using hardness tests.

Kurzfassung

Duplexstähle sind gegenüber hohen Temperaturen empfindlich, da sich ihr Gefüge verändert. Solche Gefügeänderungen können die mechanischen Eigenschaften und Korrosionseigenschaften verändern. Deshalb wurden für den vorliegenden Beitrag die mikrostrukturellen Eigenschaften von Duplexstahlschweißungen untersucht und entsprechende Gefügeveränderungen während des Schweißprozesses mittels Finite-Elemente-Analysen vor dem Fertigungsprozess bestimmt. Hierzu wurde ein 2205 Duplexstahl mittels WIG-Verfahrens geschweißt. Die Wärmeverteilung im Querschnitt der Schweißungen entsprechend der WIG-Schweißparamter wurde mittels Finite-Elemente-Analyse unter Verwendung der Software ANSYS berechnet. Nach metallographischer Präparation der Schweißungen wurde jede Probe elektrochemisch geätzt und das Ferrit-Austenit-Verhältnis mittels Lichtmikroskopie untersucht. Die Ergebnisse der Finite-Elemente-Analysen und der Mikroskopie wurden verglichen und die mechanischen Eigenschaften der Schweißungen mittels Härtemessungen untersucht.

**Correspondence Address Alptekin Kisasoz, Yildiz Technical University, Department of Metallurgy and Materials Engineering, Davutpasa Campus, TR 34210, Esenler, Istanbul, Turkey, E-mail: akisasoz@gmail.com

Alptekin Kisasoz, born in 1985, received his BS degree in Metallurgical and Materials Engineering from Yildiz Technical University, Istanbul, Turkey, in 2008. He has been employed at the Department of Metallurgical and Materials Engineering at Yildiz Technical University as a research assistant since 2009. He received his MSc degree from the same department in 2010. He is working on welding metallurgy, heat treatment, metal matrix composites and tool steels.

Prof. Dr. mont. Dipl.-Ing. Ahmet Karaaslan, born in 1968, studied Metallurgy and Materials Engineering from 1986 to 1990 at Yildiz Technical University, Istanbul, Turkey, and received his doctoral degree in 1999 from the Institute for Metals Science and Materials Testing at the Montan-University in Loeben, Austria. Since 1999, he is in the section Materials Engineering at Yildiz Technical University.

Presented during the 3^rd International Conference on Welding Technologies and Exhibition (ICWET'14) in Manisa, Turkey

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Published Online: 2014-10-11

Published in Print: 2014-10-01

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https://doi.org/10.3139/120.110633