STRESS CORROSION CRACKING BEHAVIORS FOR DIFFERENT NI-BASED WELDING MATERIALS IN HIGH TEMPERATURE AND HIGH PRESSURE WATER

J Chin Soc Corr Pro

2011, Vol. 31

Issue (6): 436-440 DOI:

Research Articles

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STRESS CORROSION CRACKING BEHAVIORS FOR DIFFERENT NI-BASED WELDING MATERIALS IN HIGH TEMPERATURE AND HIGH PRESSURE WATER

LI Xiaohui, WANG Jianqiu, HAN EnHou, KE Wei

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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Abstract U-bend immersion tests were used for studying the stress corrosion cracking behaviors for electroslag welding (ESW) Alloy 600, electroslag welding (ESW) Alloy 690 and submerged-arc welding (SAW) Alloy 690. Results showed that electroslag welding Alloy 600, electroslag welding Alloy 690 and submerged-arc welding Alloy 690 samples were immune to stress corrosion cracking in simulated primary water of pressurized water reactor (PWR) after being immersed for 1193 h, which contained 1.5×10^-3 B, 2.3×10^-6 Li, 2.5×10^-6 H₂ at 325 ℃, 15.8 MPa. However, stress corrosion cracks were observed in electroslag welding Alloy 600 after being immersed in 10 wt.% NaOH alkali solution for 720 h at 330℃, 11 MPa. The maximum crack length was 835 μm after 720 h immersion and further expanded to 1135 μm after 1440 h immersion with a typical intergranular stress corrosion cracking (IGSCC) characteristic. For electroslag welding Alloy 690, microcracks were initiated with the length of 0.3 μm to 1.15 μm and stress corrosion crack was not observed.

Key words: electroslag welding alloy 600 electroslag welding alloy 690 submerged-arc welding alloy 690 stress corrosion cracking

Received: 03 September 2010

ZTFLH:

TG172.8

Corresponding Authors: WANG Jianqiu E-mail: wangjianqiu@imr.ac.cn

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LI Xiaohui, WANG Jianqiu, HAN EnHou, KE Wei. STRESS CORROSION CRACKING BEHAVIORS FOR DIFFERENT NI-BASED WELDING MATERIALS IN HIGH TEMPERATURE AND HIGH PRESSURE WATER. J Chin Soc Corr Pro, 2011, 31(6): 436-440.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2011/V31/I6/436

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