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51313-02583-Rapid Corrosion Test for Detecting Intermetallic Phases in Duplex Stainless Steels

Product Number: 51313-02583-SG
ISBN: 02583 2013 CP
Author: Troels Mathiesen
Publication Date: 2013
$0.00
$20.00
$20.00

Recent examples of improperly heat treated duplex fittings have created the need for rapid test methods for identification of sigma phase and other intermetallic phases. Several attempts have been made to simplify known methods in order to make them applicable for on-site testing. Yet metallographic examination is the only known technique that is reliable. It is sometimes combined with ferrite measurement for pre-screening. The possibilities for applying electrochemical techniques have been evaluated on duplex specimens representing different levels of sigma phase. The applied test methods include ASTM G150 for CPT determination as well as simpler approaches for measuring the resistance against localised corrosion quickly. The preliminary results of the ongoing study are promising. Distinguishing between sensitized and non-sensitized duplex steel was obtained within few minutes by performing a potentiostatic tests that may be suitable for on-site testing.

Recent examples of improperly heat treated duplex fittings have created the need for rapid test methods for identification of sigma phase and other intermetallic phases. Several attempts have been made to simplify known methods in order to make them applicable for on-site testing. Yet metallographic examination is the only known technique that is reliable. It is sometimes combined with ferrite measurement for pre-screening. The possibilities for applying electrochemical techniques have been evaluated on duplex specimens representing different levels of sigma phase. The applied test methods include ASTM G150 for CPT determination as well as simpler approaches for measuring the resistance against localised corrosion quickly. The preliminary results of the ongoing study are promising. Distinguishing between sensitized and non-sensitized duplex steel was obtained within few minutes by performing a potentiostatic tests that may be suitable for on-site testing.

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