Investigation on Hydrogen-induced Cracking Behavior of 2205 Duplex Stainless Steel Used for Marine Structure

doi:10.11902/1005.4537.2017.212

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (2): 130-137 DOI: 10.11902/1005.4537.2017.212

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Investigation on Hydrogen-induced Cracking Behavior of 2205 Duplex Stainless Steel Used for Marine Structure

Haisheng TONG¹,Yanhui SUN²,Yanjing SU³,Xiaolu PANG¹,Kewei GAO^1,³(

)

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2. Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing, Beijing 100083, China
3. Key Laboratory for Environmental Fracture Ministry of Education, University of Technology Beijing, Beijing 100083, China

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Abstract

The hydrogen-induced cracking behavior of a new-designed duplex stainless steel 2205 (including its two-subtypes A-DSS and B-DSS) used for marine structures in artificial seawater was investigated by means of slow strain rate test (SSRT), mechanical test and scanning electron microscope. While the hydrogen permeation behavior of A-DSS and B-DSS was studied by Devanathan-Stachurski's hydrogen permeation technique. The results showed that the hydrogen diffusion coefficients for A-DSS and B-DSS were 2.36×10^-10 and 2.31×10^-10 cm²/s, respectively. A-DSS and B-DSS exhibited the lowest susceptibilities to environment induced fracture when the applied cathodic potentials were -800 and -700 mV (SCE), respectively. Correspondingly, SEM observations of the fracture surface of the above two steels showed that cracks initiated in ferrite phase, and were arrested by austenite phase or interface boundaries of ferrite/austenite.

Key words: 2205 duplex stainless steel cathodic polarized hydrogen embrittlement crack initiation

Received: 18 December 2017

ZTFLH:

TG174.1

Fund: National High Technology Research and Development Program of China(2015AA03A502);National Natural Science Foundation of China(51771026)

Corresponding Authors: Kewei GAO E-mail: kwgao@mater.ustb.edu.cn

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	Haisheng TONG
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Cite this article:

Haisheng TONG,Yanhui SUN,Yanjing SU,Xiaolu PANG,Kewei GAO. Investigation on Hydrogen-induced Cracking Behavior of 2205 Duplex Stainless Steel Used for Marine Structure. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 130-137.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.212 OR https://www.jcscp.org/EN/Y2019/V39/I2/130

Table 1 Chemical compositions of two duplex stainless steels

Fig.1 OM images of A-DSS (a) and B-DSS (b) steels

Fig.2 Stress-stain curves of A-DSS (a) and B-DSS (b) steels under different conditions

Table 2 Elongation values of A-DSS and B-DSS steels under different conditions

Fig.3 Tensile strengths of A-DSS (a) and B-DSS (b) steels under different tensile conditions

Fig.4 Variations of plasticities of A-DSS (a) and B-DSS (b) steels under different tensile conditions

Fig.5 Variations of environmental fracture susceptibilities of A-DSS (a) and B-DSS (b) steels with applied potential

Fig.6 Surface morphologies of A-DSS steel under different applied potentials: (a) open circuit potential, (b) -800 mV, (c) -850 mV, (d) -900 mV, (e) -1000 mV, (f) -1200 mV

Fig.7 Surface morphologies of B-DSS steel under different applied potentials: (a) open circuit potential, (b) -700 mV, (c) -750 mV, (d) -800 mV, (e) -1000 mV, (f) -1200 mV

Fig.8 Fracture surfaces of A-DSS steel under different conditions: (a) in air, (b) open circuit potential, (c) -800 mV, (d)-850 mV, (e) -900 mV, (f) -1000 mV, (g) -1200 mV

Fig.9 Fracture surfaces of B-DSS steel under different conditions: (a) in air, (b) open circuit potential, (c) -700mV, (d) -750 mV, (e) -800 mV, (f) -1000 mV, (g) -1200 mV

Fig.10 Morphologies of cracks near fracture surfaces of A-DSS (a) and B-DSS (b) steels

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