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Transactions of the Indian Institute of Metals

, Volume 68, Issue 4, pp 501–511 | Cite as

Evaluation of Self-Healing Behaviour of AISI 304 Stainless Steel

  • Harshal AgrawalEmail author
  • Pranshu Sharma
  • Piyush Tiwari
  • R. V. Taiwade
  • R. K. Dayal
Technical Paper

Abstract

AISI 304 stainless steel (SS) is used in applications like automotive, oil, gas and the food industry due to its excellent combination of corrosion resistance and mechanical properties. However, due to sensitisation, its corrosion resistance reduces, rendering it more vulnerable to inter-granular corrosion. Prolonged ageing in the sensitisation temperature range (450–850 °C) shows signs of restoration of corrosion resistance. This self-healing behaviour can be attributed to subsequent reduction of the chromium-depleted zones. This work focuses on thermal ageing of AISI 304 stainless steel at 750 °C for various time durations up to 960 h. The extent of sensitisation and de-sensitisation were analysed, qualitatively by metallographic inspection and quantitatively by electrochemical techniques. The highest degree of sensitisation was 42.74 % for sample heat treated for 96 h, after which the initiation of restoration of corrosion resistance was observed. These results were further confirmed by electron probe micro-analyser studies.

Keywords

AISI 304 stainless steel Sensitisation Self-healing Chromium depleted zones Electro-chemical tests 

Notes

Acknowledgments

The authors would like to thank the Director, VNIT Nagpur for providing the necessary facilities for carrying out this investigation and for his constant encouragement to publish this work. The authors are grateful to Miss Adeeba Khan (research scholar, corrosion laboratory, MME), Mr. Shreedhar Gadge (technician, MME), Mrs. Varsha Patankar (technical staff, MME). The authors are grateful to Mr. VedPrakash Sabarwal, Emfab Engineers, MIDC, Nagpur for providing AISI 304 SS. The authors would also like to express their gratitude towards Mr. Jagdish Singh (scientific officer) at the Indian Institute of Technology, Roorkee for conducting EPMA line scans.

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Copyright information

© The Indian Institute of Metals - IIM 2014

Authors and Affiliations

  • Harshal Agrawal
    • 1
    Email author
  • Pranshu Sharma
    • 1
  • Piyush Tiwari
    • 1
  • R. V. Taiwade
    • 1
  • R. K. Dayal
    • 2
  1. 1.Department of Metallurgical and Materials EngineeringVisvesvaraya National Institute of TechnologyNagpurIndia
  2. 2.School of Mechanical and Building SciencesVIT UniversityChennaiIndia

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