Effect of Phosphating on Hydrogen Embrittlement of SA-540 B23 Steel for Nuclear Reactor Coolant Pump Bolt

doi:10.11902/1005.4537.2019.110

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (6): 539-544 DOI: 10.11902/1005.4537.2019.110

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Effect of Phosphating on Hydrogen Embrittlement of SA-540 B23 Steel for Nuclear Reactor Coolant Pump Bolt

ZHAO Dongyang¹, ZHOU Yu¹(

), WANG Dongying², NA Duo¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Nuclear Division, Shenyang Blower Works Group Co. , Ltd. , Shenyang 110869, China

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Abstract

The effect of phosphating on the fracture behavior of a domestic SA-540 B23 steel used for nuclear reactor coolant pump bolt is studied by scanning electron microscope (SEM), hydrogen content analysis and in-situ hydrogen charging slow strain rate test (SSRT). The result shows that phosphating treatment has no effect on the fracture properties of B23 steel. Hydrogen content analysis shows that hydrogen is mainly distributed in the phosphate coating instead of the substrate. Hydrogen embrittlement tests show that B23 has obvious hydrogen embrittlement susceptibility under the attack of hydrogen, and the fracture feature is intergranular cracking.

Key words: B23 bolt phosphate hydrogen embrittlement fracture toughness

Received: 19 July 2019

ZTFLH:

TG178

Corresponding Authors: ZHOU Yu E-mail: yzhou@imr.ac.cn

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Cite this article:

ZHAO Dongyang, ZHOU Yu, WANG Dongying, NA Duo. Effect of Phosphating on Hydrogen Embrittlement of SA-540 B23 Steel for Nuclear Reactor Coolant Pump Bolt. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 539-544.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.110 OR https://www.jcscp.org/EN/Y2020/V40/I6/539

Table 1 Chemical composition of B23 steel (mass fraction / %)

Fig.1 Dimensional drawings of tensile specimen (a) and fracture toughness specimen (b) and relational graph between fracture toughness K_IC and specimen thickness B (c) (unit: mm)

Fig.2 Microstructure of B23 steel

Fig.3 Comparison of stress-strain curves of untreated and phosphated B23 main bolt samples during slow strain rate tension test in air

Fig.4 Slow strain rate tension curves of B23 main bolt samples in 1 mol/L NaCl solution (10 mA/cm²) under electrochemical hydrogen charging

Fig.5 Fracture morphology of B23 steel after slow strain rate tension in air at room temperature (a) and the magnified image of the red circle area marked in Fig.5a (b)

Fig.6 Fracture morphology of B23 steel after slow strain rate tension under electrochemical hydrogen charging at 10 mA/cm² (a) and the magnified image of the red circle area marked in Fig.6a (b)

Table 2 Hydrogen contents of B23 main bolt specimens before and after phosphating and after removing the phosphating layer

Fig.7 P-V (a) and K-P (b) curves of untreated B23 main bolt during fracture toughness test

Fig.8 P-V (a) and K-P (b) curves of phosphated B23 main bolt during fracture toughness test

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