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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microstructure and corrosion resistance of radial friction welded supermartensitic stainless steels

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Author(s):
Carlos Alberto Della Rovere ; Celso Roberto Ribeiro ; Rodrigo da Silva ; Nelson Guedes de Alcântara ; Sebastião Elias Kuri
Total Authors: 5
Document type: Journal article
Source: Soldagem & Inspeção; v. 19, n. 3, p. -, Set. 2014.
Abstract

In this work, supermartensitic stainless steel pipes were radial friction (RF) welded and their corrosion behavior were studied based on potentiodynamic polarization and double loop - electrochemical potentiokinetic reactivation (DL-EPR) tests. Measurements were performed on samples taken from the base metal (BM), weld interface, and consumable ring (CR) of the RF weldment. The corrosion properties were discussed in terms of their resulting metallurgical microstructure. The precipitation of Cr carbides that takes place during the tempering treatment induces a substantial Cr depletion value (Ir/Ia = 54,22%). On the other hand, CR and weld interface regions, which had their microstructure transformed and their Cr carbide precipitates redissolved by the RF welding thermomechanical cycle, present a low level of Cr depletion (Ir/Ia < 1%). The AC microstructure, which is composed of a mixture of virgin martensite and stable retained austenite, presents an increase in pitting corrosion resistance compared to the tempered structure of the BM region. It was also observed that the &#948;-ferrite decreases the pitting resistance of the weld interface region. (AU)

FAPESP's process: 12/16113-6 - ELABORATION, CHARACTERIZATION AND CORROSION RESISTANCE OF SHAPE MEMORY STAINLESS STEELS
Grantee:Carlos Alberto Della Rovere
Support type: Scholarships in Brazil - Post-Doctorate