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Characterization of Sigma Phase in Duplex Stainless Steels Using Non-destructive Ultrasonic Techniques

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Published/Copyright: August 22, 2013
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Abstract

Duplex stainless steels have wide applications in industry due to their high mechanical strength, excellent toughness, and high corrosion resistance regarding to other types of steels. However, these steels are susceptible to form brittle phases during heat treatment associated to manufacture or welding processes, in particular the negative effect of sigma-phase into ferrite-austenitic microstructure has to be pointed out. In this work, a study is carried out about the use of ultrasonic nondestructive technique to establish a relationship between sigma phase signal percentages in 2507 duplex stainless steel and more relevant features of the collected ultrasonic signal in an equation. Thus, a novel method is obtained to perform the inspection of these materials in-situ in order to avoid the loss of mechanical resistance and to increase the susceptibility to localized corrosion in service.

Abstract

Duplexstähle haben ein breites indus­trielles Anwendungsfeld aufgrund ihrer hohen mechanischen Festigkeit, exzellenten Zähigkeit und ihres hohen Korrosionswiderstandes im Vergleich zu anderen Stahlsorten. Dennoch sind diese Stähle anfällig für die Bildung spröder Phasen während der Wärmebehandlung bei Verarbeitungs- oder Schweißprozessen, wobei besonders der negative Effekt der Sigmaphase in der ferritisch-austenitischen Mikrostruktur betonen ist. Die diesem Beitrag zugrunde liegende Studie wurde durchgeführt, um die Verwendung von zerstörungsfreien Ultraschalltechniken prozentuale Abhängigkeiten zu untersuchen, ob damit in 2507 Duplexstahl von relevanten Kenndaten des Ultraschallsignales in einer Gleichung dargestellt werden können. Damit steht ein neuartiges Verfahren zur Verfügung, um diese Werkstoffe in-situ zu inspizieren und somit einen Verlust ihrer mechanischen Eigenschaften sowie eines Anstieges der Anfälligkeit für Lokalkorrosion im Betrieb zu vermeiden.

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Published Online: 2013-08-22
Published in Print: 2013-06-03

© 2013, Carl Hanser Verlag, München

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