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Mechanical Properties and Microstructural Analysis of AISI 304 and Duplex 2550 Welded by GTAW and SMAW Techniques

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Abstract:

This study investigates the mechanical properties and microstructure of dissimilar welds between AISI 304 and Duplex 2550 using GTAW and SMAW processes with filler metals ER309 and E309-16. The weld joint exhibited a tensile strength of 508.7 MPa, lower than AISI 304's minimum of 515 MPa and Duplex 2550's 760 MPa, primarily due to the heat-affected zone (HAZ). Significant differences in hardness were observed, with the weld metal averaging 194.8 HV, compared to 181.9 HV and 229.9 HV for the HAZ of AISI 304 and Duplex 2550, respectively. Charpy tests indicated reduced impact energy and absorption in the weld metal and HAZ compared to the base metal. XRD analysis revealed the formation of intermetallic phases, including chi (χ), sigma (σ), and carbides in the weld metal, which compromised mechanical properties and corrosion resistance.

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Periodical:

Materials Science Forum (Volume 1195)

Pages:

23-32

DOI:

https://doi.org/10.4028/p-YxnQ87

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Online since:

June 2026

Authors:

Syukran Syukran*, Winarto Winarto, Muhammad Anis

Keywords:

AISI 304, Duplex 2550, GTAW, Intermetallic Phases, SMAW

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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