Effect of Electrochemical Hydrogen Charging on Hydrogen Embrittlement Sensitivity of Cr15 Ferritic and 304 Austenitic Stainless Steels

doi:10.11902/1005.4537.2020.099

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (2): 202-208 DOI: 10.11902/1005.4537.2020.099

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Effect of Electrochemical Hydrogen Charging on Hydrogen Embrittlement Sensitivity of Cr15 Ferritic and 304 Austenitic Stainless Steels

ZHANG Huiyun¹^,², ZHENG Liuwei¹^,³, MENG Xianming², LIANG Wei¹^,³(

)

^1.School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
^2.Department of Mecharical Marfacturing Engineering, Shanxi Engineering Vocational College, Taiyuan 030009, China
^3.Instrumental Analysis Center of Taiyuan University of Technology, Taiyuan 030024, China

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Abstract

The effect of the charging time and current density of the electrochemical hydrogen charging process, as well as the crystallographic structure of the steel on the hydrogen embrittlement sensitivity of stainless steels were assessed via slow strain rate tensile test. The results showed that for ferritic stainless steel, with the increase of hydrogen charging time and current density, the plasticity decreases significantly, and the sensitivity of hydrogen embrittlement increases greatly. The SEM observation results of the fracture morphology show that the fracture type changed from ductile fracture to brittle fracture. As a contrast, under the same conditions, the sensitivity of hydrogen embrittlement of austenitic stainless steel was lower, and the resistance of hydrogen embrittlement was higher. It was found that there was a large amount of hydrogen on the surface of the tested steel after hydrogen charging, and the hydrogen content gradually decreased with the depth of the sample. As hydrogen traps, grain boundaries may affect the hydrogen embrittlement sensitivity of steels.

Key words: electrochemical hydrogen charging ferritic stainless steel austenitic stainless steel hydrogen embrittlement sensitivity

Received: 10 June 2020

ZTFLH:

TG142.71

Fund: Shanxi Technology Innovation Project of Colleges and Universities(2019L0994);Key Project of;Shanxi Vocational College of Engineering(KYF-201903)

Corresponding Authors: LIANG Wei E-mail: liangwei@tyut.edu.cn

About author: LIANG Wei, E-mail: liangwei@tyut.edu.cn

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Cite this article:

ZHANG Huiyun, ZHENG Liuwei, MENG Xianming, LIANG Wei. Effect of Electrochemical Hydrogen Charging on Hydrogen Embrittlement Sensitivity of Cr15 Ferritic and 304 Austenitic Stainless Steels. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 202-208.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.099 OR https://www.jcscp.org/EN/Y2021/V41/I2/202

Table 1 Chemical compositions of two tested steels (mass fraction / %)

Fig.1 Dimentions of specimen for tensile test at room temperature (unit: mm)

Fig.2 Schematic diagram of electrochemical hydrogen charging

Fig.3 IPF maps of Cr15 (a) and 304 (b) stainless steels

Fig.4 XRD patterns of Cr15 (a) and 304 (b) stainless steels

Table 2 Tensile test results of Cr15 stainless steel before and after hydrogen charging

Fig.5 Effects of hydrogen-charging time (a) and current density (b) on strength and elongation of Cr15 stainless steel

Fig.6 Fracture morphologies of Cr15 stainless steel before (a) and after hydrogen charging at 10 mA/cm² for 24 h (b) and 48 h (c), and at 20 mA/cm² for 24 h (d)

Fig.7 Surface distribution of hydrogen on Cr15 stainless steel after hydrogen charging

Table 3 Tensile test results of 304 stainless steel before and after hydrogen charging

Fig.8 Fracture morphologies of Cr15 stainless steel after hydrogen charging: general view (a) and enlarged views in the corner (I) (b), transition zone (II) (c) and center (III) (d)

Fig.9 Fracture morphologies of 304 stainless steel after hydrogen charging: general view (a) and enlarged views in the corner (I) (b), transition zone (II) (c) and center (III) (d)

Fig.10 Hydrogen distribution in 304 stainless steel after electrochemical hydrogen charging: (a) mass spectrum of hydrogen, (b) mappings of the top surface, (c) mappings of cross section

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