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,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.]
Al、Ti含量对锻态Incoloy825合金组织和耐腐蚀性能的影响
投稿时间:2016-01-22  修订日期:2016-08-05
中文关键词:  锻态Incoloy825合金  Al、Ti含量  组织  耐腐蚀性能
基金项目: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
中文摘要:
      在热力学模拟Incoloy825合金成分范围内不同Al、Ti含量对合金析出相析出规律的基础上,采用光学显微镜(OM)、扫描电镜(SEM)观察了合金显微组织和腐蚀试样的表面形貌,采用电化学工作站和静态失重法测试了合金在1mol/L、3mol/L HCl溶液中的动电位极化曲线、电化学阻抗谱和腐蚀速率。结果表明,终锻温度下Incoloy825合金由基体γ相和少量Ti(C,N)析出相组成。随着Al、Ti含量提高,块状Ti(C,N)析出量增加,组织细化;锻态Incoloy825合金的腐蚀电流密度增大,耐蚀性下降,发生点蚀的倾向增大。合金的腐蚀优先从组织中块状Ti(C,N)部位出现点蚀。随着Al、Ti含量提高,合金表面的腐蚀产物逐渐由致密变得疏松多孔,对基体的保护作用下降。
The effect of varying Al, Ti contents on the microstructure and corrosion resistance property of as-forged Incoloy825 alloy
英文关键词:as-forged Incoloy825 alloy  Al, Ti contents  microstructure  corrosion resistance property
英文摘要:
      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.
作者单位E-mail
孙楠 南京航空航天大学 材料科学与技术学院 ytydbjs@163.com 
温宸 南京航空航天大学 材料科学与技术学院  
刘子利 南京航空航天大学 材料科学与技术学院 liuzili@nuaa.edu.cn 
刘希琴 南京航空航天大学 材料科学与技术学院  
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