STRESS CORROSION CRACKING OF 316Ti IN 300℃ HIGH TEMPERATURE WATER CONTAINING CHLORIDE IONS

J Chin Soc Corr Pro

2012, Vol. 32

Issue (4): 291-295 DOI:

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STRESS CORROSION CRACKING OF 316Ti IN 300℃ HIGH TEMPERATURE WATER CONTAINING CHLORIDE IONS

TANG Zhanmei, HU Shilin, ZHANG Pingzhu

China Institute of Atomic Energy, Beijing 102413

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Abstract The stress corrosion cracking (SCC) of 316Ti stainless steel (SS) in 300℃ high temperature water containing chloride ions was investigated with slow strain rate tensile (SSRT) techniques. The results showed that the values of fracture time and extension ratio and fracture energy of specimens significantly decreased with the concentration of chloride content increased, while stress corrosion sensitive index would significantly increase with the concentration of chloride ions increased. 316Ti SS was not susceptible to SCC when the chloride content was below 5 mg/L while transgranular and partially intergranular cracked when the chloride content was above 5 mg/L in aerated water. Stress corrosion cracks generally initiated from slipping steps or pits, maybe from the secondary phase ferrite. In propagation into the base metal, the cracks would be arrested by the secondary phase ferrite, so as to improve the resistance of SCC for 316Ti SS. Oxygen played a crucial role in SCC initiation and propagation of 316Ti SS in high temperature water.

Key words: slow strain rate tension tests stress corrosion cracking crack initiation crack propagation

Received: 22 August 2011

ZTFLH:

TG172.82

Corresponding Authors: TANG Zhanmei E-mail: zhanmeitang@163.com

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Cite this article:

TANG Zhanmei, HU Shilin, ZHANG Pingzhu. STRESS CORROSION CRACKING OF 316Ti IN 300℃ HIGH TEMPERATURE WATER CONTAINING CHLORIDE IONS. J Chin Soc Corr Pro, 2012, 32(4): 291-295.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I4/291

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