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孙楠,温宸,刘子利,刘希琴.Al、Ti含量对锻态Incoloy825合金组织和耐腐蚀性能的影响[J].稀有金属材料与工程(英文),2018,47(3):860~866.[Sun Nan,Wen Chen,Liu Zili,Liu Xiqin.The effect of varying Al, Ti contents on the microstructure and corrosion resistance property of as-forged Incoloy825 alloy[J].Rare Metal Materials and Engineering,2018,47(3):860~866.]
The effect of varying Al, Ti contents on the microstructure and corrosion resistance property of as-forged Incoloy825 alloy
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Received:January 22, 2016  Revised:August 05, 2016
DOI:
Key words: as-forged Incoloy825 alloy  Al, Ti contents  microstructure  corrosion resistance property
Foundation item:江苏省六大高峰人才项目(2014-XCL-005), 江苏高校优势学科建设工程资助项目
Author NameAffiliationE-mail
Sun Nan Institute of materials science and technology,Nanjing university of aeronautics and astronautics ytydbjs@163.com 
Wen Chen Institute of materials science and technology,Nanjing university of aeronautics and astronautics  
Liu Zili Institute of materials science and technology,Nanjing university of aeronautics and astronautics liuzili@nuaa.edu.cn 
Liu Xiqin Institute of materials science and technology,Nanjing university of aeronautics and astronautics  
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Abstract:
      In this work, the effect of varying Al and Ti contents of Incoloy825 alloy on the phase transformations that might occur in the material was simulated using a thermodynamic modelling tool. Employ optical microscope (OM), scanning electron microscope (SEM) to observe the microstructure as well as the corrosion morphology of the tested alloy. Potentiodynamic polarization curves, electrochemical impedance spectroscopy and corrosion rate of the tested alloy were investigated by electrochemical workstation and static weight-loss method in 1mol/L, 3mol/L HCl solutions. The results indicate that the microstructure of as-forged Incoloy825 is composed of γ substrate and a small quantity of Ti(C,N) at final forging temperature. With the improvement of Al, Ti contents, precipitation volume of blocky Ti(C,N) increased gradually, grain is refined; corrosion current density increased gradually, corrosion resistance decreased significantly, tendency to pitting of the tested alloy is increased. Large, faceted Ti(C,N) particles in Incoloy825 alloy provide preferred sites for pit initiation in the chloride environments. With the improvement of Al, Ti contents, corrosion products on the tested alloy surface became more porous, the protection to matrix is decreased.