Characterization of Microstructural Changes in a Duplex Stainless Steel Using Spectral Analysis and Conventional Ultrasonic Techniques

Edda Rodríguez; Jorge Stella; Augusto Ruiz; Gemma Fargas; Antonio Mateo

doi:10.3139/120.110264

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Characterization of Microstructural Changes in a Duplex Stainless Steel Using Spectral Analysis and Conventional Ultrasonic Techniques

Edda Rodríguez , Jorge Stella , Augusto Ruiz , Gemma Fargas und Antonio Mateo

Veröffentlicht/Copyright: 26. Mai 2013

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Aus der Zeitschrift Materials Testing Band 53 Heft 9

Abstract

In the present study, spectral analysis of ultrasonic signals and measurements of the velocity of longitudinal ultrasonic waves have been carried out on a duplex stainless steel type 2205. Specimens were annealed at 875°C in time periods between 1800 and 86400 s in order to promote microstructural changes associated to σ-phase formation. Transducers with frequencies of 5, 10 and 17 MHz were used to obtain power spectra. The spectra corresponding to long time treatments showed a high attenuation of the ultrasonic waves, which is attributed to the precipitation of σ-phase and secondary austenite. Furthermore, overall results suggest that spectra obtained at frequencies of 10 and 17 MHz allow, with acceptable accuracy, distinguishing the microstructural changes that take place in this duplex steel for prolonged aging times.

Kurzfassung

Für die diesem Beitrag zugrunde liegende Studie wurden an einem Duplexstahl des Typs 2205 Spektralanalysen der Ultraschallsignale und Geschwindigkeitsmessungen der Longitudinalwellen durchgeführt. Hierzu wurden Proben bei 875°C über Zeiträume von 1800 und 86400 s geglüht, um Gefügeveränderungen im Zusammenhang mit der σ-Phase hervorzurufen. Es wurden Empfänger mit den Frequenzen 5, 10 und 17 MHz verwendet, um die Leistungsspektren aufzunehmen. Die Spektren im Zusammenhang mit den Langzeitwärmebehandlungen zeigten eine große Abschwächung der Ultraschallwellen, die dem Ausscheiden der σ-Phase und Sekundäraustenits zugeordnet werden konnten. Darüber hinaus zeigen die Ergebnisse insgesamt, dass die Spektren, die bei 10 und 17 MHz aufgenommen wurden, mit akzeptabler Genauigkeit eine Unterscheidung der Gefügeveränderungen erlauben, die in diesem Duplexstahl bei langen Glühzeiten auftreten.

MSc. Edda Rodriguez received a degree in metallurgical engineering and a MSc from the Central University of Venezuela in Caracas. She is member of the Department of Materials Science at the Simon Bolivar University in Caracas, Venezuela. Her research involves evaluation of materials through conventional and non-conventional ultrasonic techniques.

Dr. Jorge Stella is materials engineer and received a MSc. from Simon Bolivar University (USB) in Caracas and a doctorate in engineering from the University of Bochum in Germany. He is currently member of the Materials Science Department at USB. His research is focused on characterization of metallic materials.

Dr. Augusto Ruiz is an emeritus professor from the Simon Bolivar University (USB) in Caracas. He is materials engineer from USB and received a PhD from the Case Western Reserve University, USA. His research has focused on materials characterization of metalic and ceramic materials with special emphasis in transmission electron microscopy.

Dr. Gemma Fargas received a degree in chemistry and a doctor degree in materials science from the Barcelona Tech University (UPC) in Spain. She joined the Materials Science Department at UPC. Her work focuses on mechanical behaviour and corrosion resistance of special steels.

Dr. Antonio Mateo is a titular professor at the Barcelona Tech University (UPC) in Spain. He received a degree in engineering and a doctor degree from the UPC. He has been involved in characterization of materials with special emphasis in duplex stainless steels.

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Published Online: 2013-05-26

Published in Print: 2011-09-01

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https://doi.org/10.3139/120.110264