Phase transformation and mechanical behavior in annealed 2205 duplex stainless steel welds

Journal Article · Tue Apr 15 04:00:00 EDT 2008 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2007.03.004· OSTI ID:21062215

Badji, Riad ^[1]; Bouabdallah, Mabrouk ^[2]; Bacroix, Brigitte; Kahloun, Charlie ^[1]; Belkessa, Brahim; Maza, Halim ^[3]

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1. LPMTM-CNRS- Universite Paris 13, 99, av. J.B. Clement, 93430 Villetaneuse (France)
2. Ecole Nationale Polytechnique, 10, Avenue Hassan Badi, BP 182, El Harrach (Algeria)
3. Welding and NDT research Centre, B.P 64, Cheraga (Algeria)

The phase transformations and mechanical behaviour during welding and subsequent annealing treatment of 2205 duplex stainless steel have been investigated. Detailed microstructural examination showed the presence of higher ferrite amounts in the heat affected zone (HAZ), while higher amounts of austenite were recorded in the centre region of the weld metal. Annealing treatments in the temperature range of 800-1000 deg. C resulted in a precipitation of {sigma} phase and M{sub 23}C{sub 6} chromium carbides at the {gamma}/{delta} interfaces that were found to be preferential precipitation sites. Above 1050 deg. C, the volume fraction of {delta} ferrite increases with annealing temperature. The increase of {delta} ferrite occurs at a faster rate in the HAZ than in the base metal and fusion zone. Optimal mechanical properties and an acceptable ferrite/austenite ratio throughout the weld regions corresponds to annealing at 1050 deg. C. Fractographic examinations showed that the mode of failure changed from quasi-cleavage fracture to dimple rupture with an increase in the annealing temperature from 850 to 1050 deg. C.

• OSTI ID: 21062215
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 4 Vol. 59; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
AUSTENITE
CHROMIUM CARBIDES
CLEAVAGE
FERRITE
FRACTURES
HEAT AFFECTED ZONE
INTERFACES
MECHANICAL PROPERTIES
PHASE TRANSFORMATIONS
PRECIPITATION
STAINLESS STEELS
TEMPERATURE RANGE 1000-4000 K
WELDED JOINTS
WELDING