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Microstructure and Pitting Corrosion Characteristics of Tig Welded Joints of Super 304HCu Austenitic Stainless Steel

  • M. Vinoth Kumar

    Mari Vinoth Kumar is working as Associate Professor in Mechanical Engineering at Hindustan Institute of Technology and Science, Chennai, Tamil Nadu, India. He has done in B.E in Mechanical Engineering, M.E in Welding Technology, and Ph.D from Annamalai University. He has published more than 15 research articles in reputed journals and 13 years of experience in teaching and research. His research area are materials joining, corrosion, composites, tribology and additive manufacturing. He is member of IET and IWS.

         , C. Rajendran

    Chinnasamy Rajendran is working as an Associate Professor in Mechanical Engineering at Sri Krishna College of Engineering and Technology, Coimbatore, Tamil Nadu, India. He has completed his UG, PG, and PhD at Annamalai University in 1998, 2007, and 2017, respectively. He has published more than 40 research articles in peer reviewed international journals. His research areas are metal joining, corrosion, composite materials, tribology, and additive manufacturing

         and V. Balasubramanian
Published/Copyright: August 9, 2023
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Practical Metallography
From the journal Practical Metallography Volume 60 Issue 8

Abstract

Super 304HCu is an advanced ultra-super critical (A-USC) boiler grade austenitic stainless steel with the distinct addition of 3 wt.-% of Copper. A-USC power plants intended to operate in chloride rich environments (sea shore, feed water residues, etc.) are susceptible to chloride assisted corrosion failures. In this study, the pitting corrosion behaviour of the Super 304HCu parent material and tungsten inert gas weld joints was studied using a potentiodynamic cyclic polarization test in 3.5 % NaCl solution at three different pH levels (pH = 3, pH = 7, and pH = 11). The Epit values of the parent material is found to be much nobler than that of the weld joints. The micrographs of the pitted weld joints and the oxalic acid etched structure of Super 304HCu joints are presented. From the micrographs it is revealed that the heat affected zone is the most susceptible region to pitting corrosion.

Kurzfassung

Super 304HCu ist ein für Kraftwerke mit fortgeschrittener ultra-superkritischer Technologie (Advanced Ultra Supercritical, A-USC) geeigneter rostfreier austenitischer Kesselstahl, dem 3 Gew.-% Kupfer zugegeben wurden. Für einen Betrieb in einer chloridhaltigen Umgebung (Küste, Speisewasserrückstände etc.) vorgesehene A-USC-Kraftwerke, sind anfällig für unter Einwirkung von Chlorid entstehende Korrosionsschäden. In vorliegender Untersuchung wurde das Lochkorrosionsverhalten des Grundwerkstoffs Super 304HCu und der Wolfram-Inertgas-Schweißverbindungen mithilfe eines zyklischen potentiodynamischen Polarisationstests in 3,5 %iger NaCl-Lösung bei drei unterschiedlichen pH-Werten (pH 3, pH 7 und pH 11) untersucht. Dabei erweisen sich die ELochk.-Werte des Grundwerkstoffs als wesentlich besser als die der Schweißverbindungen. Gezeigt werden Mikroskopaufnahmen der Lochfraß aufweisenden Schweißverbindungen und des mittels Oxalsäure geätzten Gefüges von Verbindungen aus 304HCu. Aus den Aufnahmen geht hervor, dass die Wärmeeinflusszone der für Lochkorrosion anfälligste Bereich ist.

Keywords: Microstructure; polarization behaviour; oxalic acid etch test; 304HCu stainless steel; Pitting Corrosion
Schlagwörter: Gefüge; Polarisationsverhalten; Oxalsäure-Ätztest; rostfreier Stahl 304HCu; Lochkorrosion

About the authors

M. Vinoth Kumar

Mari Vinoth Kumar is working as Associate Professor in Mechanical Engineering at Hindustan Institute of Technology and Science, Chennai, Tamil Nadu, India. He has done in B.E in Mechanical Engineering, M.E in Welding Technology, and Ph.D from Annamalai University. He has published more than 15 research articles in reputed journals and 13 years of experience in teaching and research. His research area are materials joining, corrosion, composites, tribology and additive manufacturing. He is member of IET and IWS.

C. Rajendran

Chinnasamy Rajendran is working as an Associate Professor in Mechanical Engineering at Sri Krishna College of Engineering and Technology, Coimbatore, Tamil Nadu, India. He has completed his UG, PG, and PhD at Annamalai University in 1998, 2007, and 2017, respectively. He has published more than 40 research articles in peer reviewed international journals. His research areas are metal joining, corrosion, composite materials, tribology, and additive manufacturing

6

6 Acknowledgements

The authors wish to express their sincere thanks to M/s Mailam India Ltd, Puducherry, India for providing financial assistance to carry out this research work through the Mailam India Research (MIR) Fellowship and M/s Salzgitter Mannesmann Stainless Tubes Italia Srl of Italy for supplying the AISI 304HCu required to carry out this work.

6

6 Danksagung

Die Autoren möchten dem Unternehmen Mailam India Ltd, Puducherry, Indien, ihren aufrichtigen Dank für die Gewährung finanzieller Unterstützung für die Durchführung dieser Forschungsarbeit im Rahmen der Mailam India Research (MIR) Fellowship und dem Unternehmen Salzgitter Mannesmann Stainless Tubes Italia S.r.l. für die Bereitstellung des zur Durchführung dieser Untersuchung erforderlichen AISI 304HCu aussprechen.

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Received: 2022-11-08
Accepted: 2023-06-07
Published Online: 2023-08-09
Published in Print: 2023-07-30

© 2023 Walter de Gruyter GmbH, Berlin/Boston, Germany

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Investigation of Friction Welding Properties of Steels with Different Chemical and Mechanical Properties Used in the Oil and Gas Industry
  5. Microstructure and Pitting Corrosion Characteristics of Tig Welded Joints of Super 304HCu Austenitic Stainless Steel
  6. Failure Analysis
  7. SAGBO on Inner and Outer Surface of Large Alloy 800H Pipe
  8. Picture of the Month
  9. Picture of the Month
  10. News
  11. News
  12. Meeting Diary
  13. Meeting Diary
https://doi.org/10.1515/pm-2022-1034
Keywords for this article
Microstructure; polarization behaviour; oxalic acid etch test; 304HCu stainless steel; Pitting Corrosion

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Investigation of Friction Welding Properties of Steels with Different Chemical and Mechanical Properties Used in the Oil and Gas Industry
  5. Microstructure and Pitting Corrosion Characteristics of Tig Welded Joints of Super 304HCu Austenitic Stainless Steel
  6. Failure Analysis
  7. SAGBO on Inner and Outer Surface of Large Alloy 800H Pipe
  8. Picture of the Month
  9. Picture of the Month
  10. News
  11. News
  12. Meeting Diary
  13. Meeting Diary
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