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W对第三代单晶高温合金抗氧化性能的影响
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北京航空材料研究院先进高温结构材料重点实验室,北京航空材料研究院先进高温结构材料重点实验室,北京航空材料研究院先进高温结构材料重点实验室,北京航空材料研究院先进高温结构材料重点实验室,北京航空材料研究院先进高温结构材料重点实验室

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TGl32.3 2

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国防基础科研计划资助(A2220110003);兵总预研项目(00404010302)


Effect of W content on oxidation resistance of experimental third generation single crystal superalloy
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Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials

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    摘要:

    采用X射线衍射(XRD),扫描电镜(SEM)及能谱(EDX)等方法研究了不同W含量的3种试验单晶高温合金在1100℃的恒温氧化行为。结果表明: 8%W合金氧化增重最大,6%与7%W的增重量相当,3种合金氧化动力学曲线近似遵从抛物线规律。试验合金氧化100h后氧化膜剥落严重,8%W含量试验合金表面氧化膜剥落较6%与7%W合金严重,氧化膜由3层构成:最外层主要为(Ni,Co)O;中间层主要为氧化物和尖晶石相;最内层是连续的A12O3层。在合金基体形成了γ''贫化层。在本合金体系下,随W元素含量变化,改变了试验合金1100℃氧化机制,在合金设计时,兼顾合金高温强度与抗氧化性能,应选择W含量不超过7%为宜。

    Abstract:

    The isothermal oxidation behaviors of three kinds of experimental third generation single crystal superalloys with different tungsten contents were investigated at 1100℃ in air by X-ray diffraction (XRD), scanning election microscopy (SEM) and energy disperse X-ray analysis (EDX). The experimental results showed that three kinds of alloys approximately obeyed subparabolic rate law during oxidation of 100h at 1100℃. The mass gains of 8wt. % W-containing alloy remained higher than the mass gains of 6 wt.% and 7wt.% W-containing alloys. The oxide scale exposed at 1100℃ was consist of three layers: an outer Ni(Co)O layer, an intermediate layer mainly composed of oxides and spinels, and an inner Al2O3 layer. The γ′-free layer was formed in the base alloy. In the current alloy system, the transition of oxidation mechanism happened with increasing W content at 1100℃, therefore, it was found that the alloys with a W content less 7% exhibited relative balance between oxidation resistance and solution strength.

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王效光,李嘉荣,史振学,刘世忠,岳晓岱. W对第三代单晶高温合金抗氧化性能的影响[J].稀有金属材料与工程,2017,46(9):2493~2498.[WANG Xiaoguang, LI Jiarong, SHI Zhenxue, LIU Shizhong, YUE Xiaodai. Effect of W content on oxidation resistance of experimental third generation single crystal superalloy[J]. Rare Metal Materials and Engineering,2017,46(9):2493~2498.]
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  • 收稿日期:2015-05-11
  • 最后修改日期:2016-01-15
  • 录用日期:2016-02-24
  • 在线发布日期: 2017-11-29
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