Abstract
The aim of the present study is to investigate the effect of welding parameters both on the electrochemical corrosion behavior and tensile strength of pre- and post-electrochemical corrosion of friction welded dissimilar steels. The microstructural changes of AISI 1040/AISI 304L friction welded couples and also parent materials were analyzed by using scanning electron microscopy. The electrochemical behaviors of AISI1040/AISI304L joints were comparatively investigated by potentiodynamic polarization curve test and by electrochemical impedance spectra. Moreover, tensile strength experiments were carried out determining the behavior of friction welded joints of pre- and post-electrochemical corrosion and results indicated that the maximum tensile test value of the dissimilar welded pre-electrochemical corrosion was higher than those of post-electrochemical corrosion and was also very close to AISI 1040 parent material value.
Kurzfassung
Das Ziel der diesem Beitrag zugrunde liegenden Studie bestand darin, die Auswirkung der Schweißparameter (Rotationsgeschwindigkeit und Reibzeit) auf das elektrochemische Korrosionsverhalten und die Zugfestigkeit von Schweißverbindungen aus einem Kohlenstoffstahl AISI 1040 und einem hochlegierten austenitischen Stahl AISI 304L zu untersuchen. Die Mikrostruktur der Rührreibschweißungen AISI 1040/AISI 304L und der Grundwerkstoffe wurde mittels Rasterelektronenmikroskopie untersucht. Das elektrochemische Verhalten der AISI1040/AISI304L-Verbindungen wurde vergleichsweise untersucht, in dem potentiodynamische Polarisationskurven und elektrochemische Impedanzspektren aufgenommen wurden. Darüber hinaus wurde die Zugfestigkeit der Rührreibschweißverbindungen vor und nach elektrochemischer Korrosion geprüft. Die Ergebnisse deuten darauf hin, dass für bestimmte Schweißparameter der Mischschweißverbindungen die Zugfestigkeit vor elektrochemischer Korrosion höher als nach elektrochemischer Korrosion war und nahe der des Grundwerkstoffes AISI 1040 liegt.
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