Oxidation Behavior of TP439 Stainless Steel in Water Vapor at 800 ℃

doi:10.11902/1005.4537.2022.149

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 377-383 DOI: 10.11902/1005.4537.2022.149

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Oxidation Behavior of TP439 Stainless Steel in Water Vapor at 800 ℃

LIU Huanhuan¹, LIU Guangming¹(

), LI Futian¹, MENG Lingqi², XIAHOU Junzhao², GU Jialei²

^1.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.Shanghai Electric Nuclear Power Equipment Co. Ltd., Shanghai 201306, China

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Abstract

The oxidation behavior of TP439 stainless steel in water vapor was studied by means of intermittent weighing method, field emission scanning electron microscope (FE-SEM) and X-ray diffractometer. In the initial oxidation stage, the formed oxide scale of TP439 stainless steel is very thin, the oxidation rate is fast, the oxidation kinetics conforms to the linear oxidation law with a linear rate constant k_l of 5.214×10^-2, the oxidation process is controlled by the interface reaction; with the increase of oxidation time, the oxide scale gradually thickens, which hinders the inward diffusion of oxygen ions and the outward diffusion of metal ions, the control step of the oxidation process is changed from interface reaction control to diffusion control; the oxidation kinetics in the second stage follows a parabolic law with a parabolic rate constant k_p of 1.54×10^-3, the oxidation control step is diffusion control. The main components of TP439 stainless steel oxidation products are (Cr, Fe)₂O₃ and a small amount of Cr₂O₃, Fe₂O₃, FeCr₂O₄ spinel oxides. In the early stage of oxidation, there are more oxide particles distributed along the grain boundary on the surface of the steel. This is because the grain boundary is the fast diffusion channel of elements, therefore, network-like oxides along the grain boundary emerges on the steel surface.

Key words: TP439 stainless steel high temperature oxidation water vapor oxidation kinetics

Received: 13 May 2022 32134.14.1005.4537.2022.149

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51961028)

About author: LIU Guangming, E-mail: gemliu@126.com

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Cite this article:

LIU Huanhuan, LIU Guangming, LI Futian, MENG Lingqi, XIAHOU Junzhao, GU Jialei. Oxidation Behavior of TP439 Stainless Steel in Water Vapor at 800 ℃. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 377-383.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.149 OR https://www.jcscp.org/EN/Y2023/V43/I2/377

Fig.1 Oxidation kinetics of TP439 stainless steel in Ar-90%H₂O at 800 ℃ for 48 h (a) and 2 h (b)

Fig.2 Fitting results of oxidation kinetics of TP439 stainless steel in Ar-90%H₂O at 800 ℃ in the periods of 0-2 h (a) and 2-48 h (b)

Fig.3 XRD patterns of TP439 stainless steel after isothermal oxidation at 800 ℃ for 0-1.5 h (a) and 2-48 h (b)

Fig.4 Surface morphologies (a-h) and corresponding EDS results (i-l) of the samples oxidized at 800 ℃ for 15 min (a), 30 min (b), 45 min (c), 90 min (d), 120 min (e), 240 min (f), 480 min (g) and 720 min (h)

Fig.5 Surface morphologies of the samples oxidized at 800 ℃ for 15 min (a), 30 min (b), 480 min (c) and 720 min (d)

Fig.6 Contents of O, Cr and Fe after oxidation for different time

Fig.7 Schematic diagrams of the growth of oxides along the grain boundaries of TP439 stainless steel in high temperature water vapor: (a) oxides grow along bound aries, (b) netlike oxides, (c) neilike microstructure disappeared, (d) oxide film

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