Proceedings of the International Conference Recent Advances in Materials, Processes and Technology for Sustainability (RAMPTS 2025)

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Pitting Corrosion Studies of Laser Beam Welded Hot and Cold Rolled Nb-Stabilized 5A Duplex Stainless Steel

Authors
V. Prajeesh Raj1, *, U. Sudeep1, P. Aneesh Kumar1, P. Rinchu2
1Department of Mechanical Engineering, NSS College of Engineering, APJ Abdul Kalam Technological University, Palakkad, India, 678008
2Department of Aeronautical Engineering, Jawaharlal College of Engineering Technology, Mangalam (PO), Palakkad, India
*Corresponding author. Email: rajprajeesh@gmail.com
Corresponding Author
V. Prajeesh Raj
Available Online 25 December 2025.
DOI
10.2991/978-94-6463-922-3_42How to use a DOI?
Keywords
Duplex stainless steel; Laser beam welding; Hot rolling; Cold rolling; Pitting corrosion
Abstract

This study investigates the pitting corrosion behaviors of hot and cold rolled, laser beam welded (LBW) niobium-stabilized 5A duplex stainless steel (DSS). The welded joints were produced using the laser parameters of 3.5 kW power and 4.0 m/min speed to achieve full penetration and minimal heat-affected zones (HAZ). Rolled specimen were characterized using optical microscopy, microhardness and Charpy impact strength. Hot-rolled specimens exhibited partially recrystallized microstructures with moderate hardness (180–200 HV) and superior impact toughness (70–90 J), while cold-rolled specimens showed work-hardened structures with higher hardness (220–250 HV) but lower toughness (40–60 J). Higher critical pitting temperature (CPT) values in hot-rolled joints (up to 52℃) compared to that of cold-rolled (35℃), attributed to the differences in phase balance and dislocation density. The findings highlight the influence of prior thermomechanical processing on weld performance, which is critical for structural integrity in applications involving duplex stainless steels.

Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the International Conference Recent Advances in Materials, Processes and Technology for Sustainability (RAMPTS 2025)
Series
Atlantis Highlights in Material Sciences and Technology
Publication Date
25 December 2025
ISBN
978-94-6463-922-3
ISSN
2590-3217
DOI
10.2991/978-94-6463-922-3_42How to use a DOI?
Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - V. Prajeesh Raj
AU  - U. Sudeep
AU  - P. Aneesh Kumar
AU  - P. Rinchu
PY  - 2025
DA  - 2025/12/25
TI  - Pitting Corrosion Studies of Laser Beam Welded Hot and Cold Rolled Nb-Stabilized 5A Duplex Stainless Steel
BT  - Proceedings of the International Conference Recent Advances in Materials, Processes and Technology for Sustainability (RAMPTS 2025)
PB  - Atlantis Press
SP  - 634
EP  - 651
SN  - 2590-3217
UR  - https://doi.org/10.2991/978-94-6463-922-3_42
DO  - 10.2991/978-94-6463-922-3_42
ID  - Raj2025
ER  -