Influence of Heat Treatment Process on Microstructure and Corrosion Resistance of Ultrafine Bainite Steel

doi:10.11902/1005.4537.2020.220

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (5): 602-608 DOI: 10.11902/1005.4537.2020.220

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Influence of Heat Treatment Process on Microstructure and Corrosion Resistance of Ultrafine Bainite Steel

FENG Yanpeng¹, ZHANG Xian², WU Kaiming², YANG Miao¹(

)

^1.School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China
^2.Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, China

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Abstract

A medium carbon steel was heat treated by one-step bainite isothermal, two-step bainite isothermal- and quenching-treatment respectively, and the microstructure, phase distribution, corrosion performance and electrochemical properties of the different heat treated steels were characterized. The results show that compared with the one-step bainite isothermal- and quenching-treated steels, the ultrafine bainite steel after the two-step bainite isothermal treatment has a more uniform structure with smaller proportion of retained austenite. The bainite ferrite phase in the ultrafine bainite steel is selectively dissolved due to the micro-galvanic effect between bainite ferrite and massive retained austenite, resulting in the initiation and propagation of pitting corrosion along the lath direction. However, uniformly distributed film-like retained austenite hinders the further development of corrosion. The electrochemical test results show that the two-step bainite isothermal treated steel has the best corrosion resistance, and the martensitic steel has the worst corrosion resistance.

Key words: ultra-fine bainite steel heat treatment process microstructure corrosion resistance

Received: 02 November 2020

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51601138);Foundation of the State Key Laboratory of Refractories and Metallurgy(2018QN18)

Corresponding Authors: YANG Miao E-mail: yangmiao@whut.edu.cn

About author: YANG Miao, E-mail: yangmiao@whut.edu.cn

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Cite this article:

FENG Yanpeng, ZHANG Xian, WU Kaiming, YANG Miao. Influence of Heat Treatment Process on Microstructure and Corrosion Resistance of Ultrafine Bainite Steel. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 602-608.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.220 OR https://www.jcscp.org/EN/Y2021/V41/I5/602

Fig.1 OM images (a~c) and SEM images (d~f) for one-step bainite steel (a, d), two-step bainite steel (b, e), and martensitic steel (c, f)

Fig.2 XRD patterns of the experimental steels

Fig.3 In-situ morphologies of one-step bainite steel (a, d), two-step bainite steel (b, e) and martensitic steel (c, f) after corrosion for 10 min (a~c) and 60 min (d~f)

Fig.4 Potentiodynamic polarization plots of the experimental steels

Table 1 Potential polarization Tafel fitting values of the experimental steels

Fig.5 Nyquist (a) and Bode (b, c) plots curves of the experimental steels

Table 2 Fitting values of AC impedance circuit of the experimental steels

Fig.6 Initial corrosion mechanism diagram of one-step bainite steel (a, d), two-step bainite steel (b, e) and martensitic steel (c, f)

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