Effect of Aging on Microstructures and Localized Corrosion of Custom455 Martensitic Age-hardening Stainless Steel

doi:10.11902/1005.4537.2023.365

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (5): 1285-1294 DOI: 10.11902/1005.4537.2023.365

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Effect of Aging on Microstructures and Localized Corrosion of Custom455 Martensitic Age-hardening Stainless Steel

HONG Xiaomu¹, WANG Yongqiang¹(

), LI Na², TIAN Kai¹, DU Juan¹

1 School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243002, China
2 School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243002, China

Cite this article:

HONG Xiaomu, WANG Yongqiang, LI Na, TIAN Kai, DU Juan. Effect of Aging on Microstructures and Localized Corrosion of Custom455 Martensitic Age-hardening Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1285-1294.

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Abstract

The effect of aging treatment at 400-500^oC for different times on the microstructure and pitting resistance of Custom455 martensitic age-hardening stainless steel was investigated using OM, XRD, TEM and electrochemical methods. The results show that the microstructure of the ageing-treated steels consists of lath martensite and reversed austenite, and with the change of aging temperature and time, the second phase particles such as Cu-rich phases and Ni₃Ti with varying amount and size will be precipitated. For a given aging time, while the aging temperature increased, the amount of reversed austenite will also gradually increase, however the amount and size of Ni₃Ti, ε-Cu and other second-phase particles will not change obviously, so that the pitting corrosion resistance of the steel increased; when the aging temperature rises to 600^oC, a large number of the second-phase particles of Ni₃Ti, ε-Cu and others precipitate out, which leads to a decrease in the pitting corrosion resistance of the steel. When the aging temperature is consistent while the aging time rises to 3 h, the amount of reversed austenite in the steel does not change significantly, but the amount and size of Ni₃Ti, ε-Cu and other second-phase particles change significantly with the increasing aging time, which also leads to a decrease in the pitting corrosion resistance of the steel.

Key words: Martensitic aging stainless steel aging treatment pitting reversed austenite copper-rich precipitation phase

Received: 20 November 2023 32134.14.1005.4537.2023.365

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(52171059, 51971003)

Corresponding Authors: WANG Yongqiang, E-mail: yqwang@ahut.edu.cn

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	HONG Xiaomu
	WANG Yongqiang
	LI Na
	TIAN Kai
	DU Juan

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.365 OR https://www.jcscp.org/EN/Y2024/V44/I5/1285

Fig.1 Calculated phase diagram of Custom455 steel by JMatPro software

Fig.2 Metallographic structures of Custom455 steel after solid solution (a) and aging (b-i) heat treatments: (b) 400^oC/3 h, (c) 450^oC/3 h, (d) 500^oC/3 h, (e) 550^oC/3 h, (f) 600^oC/3 h, (g) 500^oC/1 h, (h) 550^oC/1 h, (i) 600^oC/1 h

Fig.3 XRD patterns of Custom455 steel after aging at different temperatures for 1 h (a) and 3 h (b)

Fig.4 Statistical values of the contents of reversed austenite in Custom455 steel aged at different temperatures

Fig.5 TEM images of Custom455 steel after aging treatments with different parameters: (a) 400^oC/3 h, (b) 500^oC/1 h, (c) 500^oC/3 h, (d) 600^oC/1 h, (e, f) 600^oC/3 h

Table 1 EDS results of the marked points in Fig.5f for the specimen aged at 600^oC for 3 h

Fig. 6 TEM images of Custom455 steel aged at 500^oC (a, b) and 600^oC (c, d) for 1 h (a, c) and 3 h (b, d), respectively

Fig.7 Precipitation phases of Custom455 steel after aging at 500^oC for 3 h: (a) Ni₃Ti, (b, c) ε-Cu

Fig.8 Polarization curves of Custom455 steel aged for 1 and 3 h at 400^oC (a), 450^oC (b), 500^oC (c), 550^oC (d) and 600^oC (e)

Fig.9 Polarization curves of Custom455 steel after aging treatments at different temperatures for 1 h (a) and 3 h (b)

Fig.10 Pitting potentials of Custom455 steel aged at different temperatures for 1 and 3 h

Fig.11 Equivalent circuit diagram for EIS fitting

Fig.12 Nyquist plots of Custom455 steel after aging treatments for 1 and 3 h at 400^oC (a), 450^oC (b), 500^oC (c), 550^oC (d) and 600^oC (e)

Fig.13 Nyquist plots of Custom455 steel after aging treatments at different temperatures for 1 h (a) and 3 h (b)

Fig.14 Bode plots of Custom455 steel after aging treatments at different temperatures for 1 h (a) and 3 h (b)

Table 2 Fitting electrochemical parameters of EIS of Custom455 stainless steel with 1 h aging in 3.5%NaCl solution

Table 3 Fitting electrochemical parameters of EIS of Custom455 stainless steel with 3 h aging in 3.5%NaCl solution

Fig.15 Pitting morphologies of Custom455 steel after solid solution (a) and aging treatments at 400^oC for 3 h (b), 500^oC for 3 h (c), 600^oC for 1 h (d) and 600^oC for 3 h (e)

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