Stress Corrosion Crack Propagation Behavior of Elbow Pipe of Nuclear Grade 316LN Stainless Steel in High Temperature High Pressure Water

doi:10.11902/1005.4537.2017.006

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (1): 54-61 DOI: 10.11902/1005.4537.2017.006

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Stress Corrosion Crack Propagation Behavior of Elbow Pipe of Nuclear Grade 316LN Stainless Steel in High Temperature High Pressure Water

Ruolin ZHU^1,², Litao ZHANG¹, Jianqiu WANG¹(

), Zhiming ZHANG¹, En-Hou HAN¹

1 Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 China Nuclear Power Operation Technology Corporation, LTD, Wuhan 430223, China

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Abstract

The stress corrosion crack propagation behavior of the elbow pipe of nuclear grade 316LN stainless steel (SS) in high temperature high pressure water was studied by means of direct current potential drop (DCPD) method coupled with in-situ measuring the crack length of the compact tension (CT) specimen, as well as scanning electron microscope (SEM) and electron back scattering diffraction (EBSD) technique. Results indicated that the crack growth rate monotonically increased with the increase of temperature ranging from 270 ℃ to 330 ℃, and the crack growth rate at 330 ℃ was 1.7 fold of that at 270 ℃. The apparent activation energy (E_aae) for stress corrosion crack propagation of 316LN SS was 52 kJ/mol. The crack growth rate of 316LN SS was affected by the solution with dissolved 1500 mg/L B+2.3 mg/L Li in high temperature high pressure water and the influence extent depended on the pH of the solution. The results of the crack growth rates could provide data support for the plant safety evaluation and remnant life prediction. Intergranular stress corrosion cracking was observed for the fractured surface of 316LN stainless steel tested in pressurized high temperature water. The crack propagated along with the large angle grain boundaries instead of the coincidence site lattice (CSL) boundaries and lots of secondary cracks were observed. Moreover, the residual strain at the grain boundary was larger than that of the interior of grains.

Key words: austenite stainless steel high temperature high pressure water stress corrosion cracking crack growth rate

Received: 09 January 2017

ZTFLH:

TG172

Fund: Supported by National Key Research and Development Program (2017YFB0702100), National Natural Science Foundation (51771211), Key Research Program of Frontier Sciences, Chinese Academy of Sciences (QYZDY-SSWJSC012) and Key Program of the Chinese Academy of Sciences (ZDRW-CN-2017-1)

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	Ruolin ZHU
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	En-Hou HAN

Cite this article:

Ruolin ZHU, Litao ZHANG, Jianqiu WANG, Zhiming ZHANG, En-Hou HAN. Stress Corrosion Crack Propagation Behavior of Elbow Pipe of Nuclear Grade 316LN Stainless Steel in High Temperature High Pressure Water. Journal of Chinese Society for Corrosion and protection, 2018, 38(1): 54-61.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.006 OR https://www.jcscp.org/EN/Y2018/V38/I1/54

Fig.1 Schematic illustrations of the 316LN SS elbow pipe (a) and the location of the 1/2T CT specimen (b)

Fig.2 Dimensions of the 1/2T CT specimen

Table 1 Test conditions of the stress corrosion cracking and crack growth rates for 316LN SS in high temperature high pressure water at 270~330 ℃

Fig.3 Crack length vs time curve of 316LN SS during corrosion fatigue in high temperature high pressure water at 310 ℃

Fig.4 Curve of crack length vs time for 316LN SS during stress corrosion cracking in high temperature high pressure water at 270~310 ℃

Fig.5 Pourbaix diagram for nickel species in the ternary system of Fe-Cr-Ni at 300 ℃ and [Fe(aq)]_tot=[Cr(aq)]_tot=[Ni(aq)]_tot=10^-6 molal^[20]

Fig.6 Effect of temperature (270~310 ℃) on the crack growth rate of 316LN SS during SCC test

Fig.7 Optical microscope image of the fracture surface of 316LN SS after stress corrosion test in high temperature high pressure water at 270~310 ℃

Fig.8 SEM images of the fracture surface of 316LN SS tested in high temperature high pressure water at 270~310 ℃: (a) overall morphology; (b) initial morphology, showing the transformation from transgranular fatigue corrosion crack to intergranular stress corrosion crack; (c) typical intergranular stress corrosion crack

Fig.9 SEM image of the crack path of 316LN SS after stress corrosion test in high temperature high pressure water at 270~310 ℃

Fig.10 EBSD images of the crack paths of 316LN SS after stress corrosion test in high temperature high pressure water at 270~310 ℃: (a) SEM morphology, (b) grain boundary characters, (c) inverse pole figure, (d) Kernel average misorientation

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