期刊
CORROSION SCIENCE
卷 52, 期 3, 页码 927-932出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.11.015
关键词
Nickel; Titanium; Polarization; Stress corrosion
资金
- Special Funds for the Major State Basic Research Projects [G2006CB605000]
Microchemistry and microstructure of TiN in Alloy 690TT were analyzed using SEM and TEM. Constant loading test was conducted on Alloy 690TT in 325 degrees C water to study effect of TiN on SCC initiation. It was found that TiN-inclusion stringers existed along the longitudinal axis. Numerous micron-size TiN with Al2O3 and/or MgO nuclei and submicron-size TiN existed in this alloy. After holding a constant load equal to 180% of the yield strength for 40 days, cracks about 1-3 mu m initiated at micron-size TiN and TiN-inclusion stringers in the near surface. The mechanisms of Alloy 690TT crack initiation at these TiN are discussed. (C) 2009 Elsevier Ltd. All rights reserved.
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