期刊
MATERIALS CHARACTERIZATION
卷 144, 期 -, 页码 356-367出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.07.033
关键词
Nickel-aluminum bronze; Corrosion fatigue behavior; Environment effects; Loading frequency; Crack tip
类别
资金
- National Basics Research Program of China (973Program) [2014CB046701]
- Fund for Doctor of Shandong Province [ZR2018BEM005]
- Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents [2017RCJJ025]
Corrosion fatigue is one of the major forms for nickel-aluminum bronze alloy used in marine propeller. It is greatly important to understand the corrosion fatigue behavior of nickel-aluminum bronze alloy in seawater for the purpose of improving the service life of marine equipment. In this study, corrosion fatigue crack growth rate of nickel-aluminum bronze alloy in 3.5% NaCl solution was tested under various stress intensity factors, stress ratios and loading frequencies to reveal its corrosion fatigue mechanism. The results show that corrosion environment significantly accelerates the crack growth and decreases the corrosion fatigue threshold, which is attributed to the corrosion reactions between the metals of crack tip and corrosive medium. Among the various factors, loading frequency has more predominant influence on the corrosion fatigue crack growth rate of nickel-aluminum bronze alloy, which can be rationally explained by the hydrogen embrittlement mechanism. Additionally, in the process of corrosion fatigue crack growth, the acidification and the dealumination would occur at the crack tip, resulting in the corrosion dissolution of kappa phases and the deterioration in mechanical properties of crack tip.
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