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| MICROSTRUCTURE NEAR SCRATCH ON ALLOY 690TT AND STRESS CORROSION INDUCED BY SCRATCHING |
| MENG Fanjiang1), WANG Jianqiu1), HAN En-Hou1), SHOJI Testuo2), KE Wei1) |
1) State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2) Fracture and Reliability Research Institute, Tohoku University, Sendai 980-8579, Japan |
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Cite this article:
MENG Fanjiang WANG Jianqiu HAN En-Hou SHOJI Testuo KE Wei. MICROSTRUCTURE NEAR SCRATCH ON ALLOY 690TT AND STRESS CORROSION INDUCED BY SCRATCHING. Acta Metall Sin, 2011, 47(7): 839-846.
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Abstract The microstructure and stress corrosion cracking (SCC) behavior of scratched zone on alloy 690TT were studied by using microhardness, TEM, EBSD-OIM and immersion experiment in caustic solution. It was found that a deformed hardening layer with a dimension range of 100 $\mu$m was produced near the scratch. TEM and EBSD-OIM observations showed that the grains at shallow surface of scratch groove were refined to nano-size. SCC tests for scratched alloy 690TT were performed in caustic solution at high temperature with or without addition of lead oxides. The results showed that SCC cracks initiated and propagated at scratch banks and scratch grooves. Grain boundaries, twin boundaries deformed and microcracks produced during scratching process are preferential sites for SCC. The oxide films formed on scratch groove were loosed by lead. The SCC crack length increased with increase of lead content. Scratched alloy 690TT is susceptible to SCC.
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Received: 06 April 2011
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| Fund: Supported by National Basic Research Program of China (No.2006CB605000) |
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