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Corrosion behavior of cold-rolled and post heat-treated 316L stainless steel in 0.9% NaCl solution

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  • Received: 14 February 2020Revised: 31 March 2020Accepted: 1 April 2020Available online: 3 April 2020
  • The effect of cold rolling and post-rolling heat-treatment on the microstructural and electrochemical properties of the 316L stainless steel is investigated. The two passes and four passes cold-rolled stainless steel specimens were heat-treated by annealing at 900 ⁰C followed by quenching in water. The microstructure of the as-rolled specimens transformed from austenite to strain-induced α'-martensite due to the significant plastic deformation that also resulted in significant grain elongation (~28 to ~54 µm). The hardness of the heat-treated specimens decreased from 190 to 146 HV due to the recovery and recrystallization of the austenite grain structure. The cyclic polarization scans of the as-rolled and heat-treated specimens were obtained in 0.9% NaCl solution. The pitting potential of the four passes rolled specimen was significantly increased to 930.5 mV from 322.3 mV after post-rolling heat treatment. The beneficial effect of the heat treatment process was evident from ~10 times lower corrosion current density and two orders of magnitude lower passive current density of the heat-treated specimens compared to as-rolled specimens. Similarly, appreciably lower corrosion rate (0.013 mpy) and higher pitting resistance (1115.5 mV) was exhibited by the post-rolled heat-treated specimens compared to as-rolled 316L stainless steel specimens.
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Corrosion behavior of cold-rolled and post heat-treated 316L stainless steel in 0.9% NaCl solution

  • Corresponding author:

    K.M. Deen    E-mail: kmdeen.ceet@pu.edu.pk; deen@mail.ubc.ca

  • 1. Corrosion Control Research Cell, Department of Metallurgy and Materials Engineering, University of the Punjab, Lahore, Pakistan
  • 2. Department of Materials Engineering, The University of British Columbia, Vancouver, V6T 1Z4, BC, Canada

Abstract: The effect of cold rolling and post-rolling heat-treatment on the microstructural and electrochemical properties of the 316L stainless steel is investigated. The two passes and four passes cold-rolled stainless steel specimens were heat-treated by annealing at 900 ⁰C followed by quenching in water. The microstructure of the as-rolled specimens transformed from austenite to strain-induced α'-martensite due to the significant plastic deformation that also resulted in significant grain elongation (~28 to ~54 µm). The hardness of the heat-treated specimens decreased from 190 to 146 HV due to the recovery and recrystallization of the austenite grain structure. The cyclic polarization scans of the as-rolled and heat-treated specimens were obtained in 0.9% NaCl solution. The pitting potential of the four passes rolled specimen was significantly increased to 930.5 mV from 322.3 mV after post-rolling heat treatment. The beneficial effect of the heat treatment process was evident from ~10 times lower corrosion current density and two orders of magnitude lower passive current density of the heat-treated specimens compared to as-rolled specimens. Similarly, appreciably lower corrosion rate (0.013 mpy) and higher pitting resistance (1115.5 mV) was exhibited by the post-rolled heat-treated specimens compared to as-rolled 316L stainless steel specimens.

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