Microstructural Transformation in the Root Pass of Superduplex Stainless Steel Multipass Welding

Abstract This work focuses on the identification of secondary phases in a superduplex stainless steel multipass welding performed by means of the GMAW process using two filler metals, one of the duplex type and the other of the superduplex type. To identify the secondary phases in the welding metal...

Full description

Saved in:
Bibliographic Details
Published inIngeniería, investigación y tecnología Vol. 18; no. 2; pp. 193 - 198
Main Authors Villalobos-Vera, Doris Ivette, Mendoza-Bravo, Ivan
Format Journal Article
LanguagePortuguese
Published Facultad de Ingeniería, UNAM 01.06.2017
Subjects
Engineering, Multidisciplinary
soldadura
welding
heat affected zone
thermal cycle
ciclo térmico
welding metal
acero inoxidable superdúplex
metal de soldadura
zona afectada térmicamente
sigma phase
superduplex stainless steel
fase sigma
GMAW
Online AccessGet full text

Cover

More Information
Summary:Abstract This work focuses on the identification of secondary phases in a superduplex stainless steel multipass welding performed by means of the GMAW process using two filler metals, one of the duplex type and the other of the superduplex type. To identify the secondary phases in the welding metal and the heat affected zone, the samples were analyzed by optical microscopy. The results showed a considerable formation of sigma phase in the welding metal in both samples, making evident the total consumption of ferrite. On the other hand, the heat affected zone corresponding to the superduplex-type filler metal, presents a remarkable sensitization, probably due to the occurrence of chromium nitrides in the center of the ferrite grains while the heat affected zone corresponding to the duplex-type filler metal depicts a more balanced microstructure of ferrite, austenite and secondary austenite.
ISSN:1405-7743