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Investigating the Mechanical Properties and Pitting Potential of Heat-Treated AISI 4340 Steel in Various Corrosive Environments

  • Shailendra Singh BhadauriaEmail author
  • Varun Sharma
  • Ajay Gupta
Conference paper
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Part of the Lecture Notes on Multidisciplinary Industrial Engineering book series (LNMUINEN)

Abstract

The corrosion and electrochemical behavior of high-strength steel AISI 4340 with or without nitrocarburizing heat-treated conditions was studied using salt spray test under 5% NaCl for 24 hours. Electrochemical experiments were also carried out under corrosive environment of a 1N H2SO4. Without heat-treated results obtained by electrochemical test between potential and log of ampere, it yields the value of corrosion potential to 269.2 mV, and in case of heat-treated sample, value obtained is to be −431.918 mV. For heat-treated samples, the rate of corrosion (Icorr) shows a continuous shifting of graph toward a positive direction, whereas in case of without heat-treated sample, the rate of corrosion (Icorr) for HT sample is higher. In salt spray test, the more corrosion product was found to be deposited on surface of heat-treated specimen. Surface morphology of the salt spray specimen is observed under SEM and optical microscope. It reveals large numbers of corrosion pits, with heavily corroded surface. It was caused due to the decrement of the chromium content in high-strength steel with an increase of nitrocarburizing heat treatment temperature. It was observed that with an increase in heat treatment time, Vickers hardness values of 4340 steel increases from 310.8 to 468.2 HV due to increase of nitrogen (N) content over the compound layer.

Keywords

Ultra-high-strength steel Corrosion rate Electrochemical behavior 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  • Shailendra Singh Bhadauria
    • 1
    Email author
  • Varun Sharma
    • 1
  • Ajay Gupta
    • 1
  1. 1.Department of Industrial and Production EngineeringDr B R Ambedkar National Institute of Technology JalandharJalandharIndia

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