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Relationship between the martensite phase transition and pitting susceptibility of AISI-321 stainless steel in acidic solutions of NaCl

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Abstract

Specimens of AISI-321 (1Cr18Ni9Ti) stainless steel with various contents of austenite are stretched to different degrees at a temperature of -70°C. The X-ray diffraction method and the method of transmission electron microophotography are applied to study the phase and structural transformations. The potentiodynamic tests and electrochemical impedance spectroscopy are used to determine the susceptibility of steel to pitting formation in acidic solutions of NaCl. The experimental investigations demonstrate that the martensite phase consists mainly of α′-martensite and its content increases with the level of strains. The interphase electrochemical parameters demonstrate that if the content of the martensite phase is lower than 6% or higher than 22%, then the susceptibility of the material to pitting formation increases with the content of the martensite phase. However, within the range 6–22%, the indicated characteristic is a decreasing function of the content of martensite.

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Authors and Affiliations

  1. College of Material and Engineering, Beijing University of Chemical Technology, Beijing, China

    Xu Chunchun, Hu Gang & Wing-Yan Ng

  2. Department of Applied Biology & Chemical Technology, Hong Kong Polytechnic University, Hong Kong, China

    Xu Chunchun, Hu Gang & Wing-Yan Ng

Authors
  1. Xu Chunchun
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  2. Hu Gang
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  3. Wing-Yan Ng
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Additional information

Published in Fizyko-Khimichna Mekhanika Materialiv, Vol. 40, No. 2, pp. 83–89, March–April, 2004.

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Chunchun, X., Gang, H. & Ng, WY. Relationship between the martensite phase transition and pitting susceptibility of AISI-321 stainless steel in acidic solutions of NaCl. Mater Sci 40, 252–259 (2004). https://doi.org/10.1007/s11003-005-0052-7

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  • DOI: https://doi.org/10.1007/s11003-005-0052-7

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