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温度对高铬二代镍基单晶高温合金 氧化行为的影响
Effect of Temperature on the Oxidation Behavior of Second Generation Nickel-Based Single Crystal Superalloy with High Cr Content
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- DOI:
- 作者:
- 常剑秀，张骁勇，王 浩，苏晓龙，贾红敏 ，沈思聪 ，申 毅 ，潘瑞娟
CHANG Jianxiu ， ZHANG Xiaoyong ， WANG Hao，SU Xiaolong ，JIA Hongmin ，SHEN Sicong ，SHEN Yi ，PAN Ruijua
- 作者单位:
- 西安石油大学 材料科学与工程学院，中国石油 长庆油田分公司 第一采气厂， 国家管网集团 西气东输公司 银川输气分公司
. College of Materials and Engineering, Xi'an Shiyou University,. College of Materials and Engineering, Xi'an Shiyou University,Yinchuan Gas Transmission Branch of West-East Gas Transmission Company, National Pipe Network Group
- 关键词:
- 单晶高温合金；恒温氧化；温度；内氮化
single crystal superalloy; isothermal oxidation; temperature; internal nitridation
- 摘要:
- 采用不连续增重法研究了一种燃机用高 Cr 二代镍基单晶高温合金在 1 000 ℃ 和 1 100 ℃ 的氧化行为，采用 XRD 和 SEM 对样品的氧化层组织形貌进行表征，分析了氧化机理及温度对合金氧化行为的影响。 研究表明，实验合金在 1 000 ℃ 的氧化动力学遵循抛物线规律，氧化 500 h 后仍具有较低的增重速率，外氧化层以 Cr 2 O 3 为主， TiO 2 呈 团 簇状分布在 Cr 2 O 3 外侧，内部有少量颗粒状 TiN ，整个氧化层完整致密，合金抗氧化性能优异。 温度升高至 1 100 ℃ 后，合金在氧化 100 h 后出现严重落，外氧化层疏松多孔，内氧化物呈网状向内部发展，内氮化物的数量明显增多，尺寸明显增大，合金抗氧化性能恶化。温度对合金氧化性能影响的机理为升温导致 Cr 2 O 3 挥发速率增大，破坏了 Cr 2 O 3 膜的致密性，增大了氧化膜的内应力，降低了氧化膜对氧、氮的抑制作用，合金的抗氧化性能降低。
The oxidation behavior of a second generation nickel-based single crystal superalloy with high Cr content at 1 000 ℃ and 1 100 ℃ was studied by the discontinuous weight gain method. The phase constituents and microstructure of the oxide layer of the alloy were characterized by XRD and SEM. The oxidation mechanism of the alloy and the difference in oxidation behavior at different temperatures were analysed, and the temperature sensitivity of the oxidation behavior of the alloy was clarified. The results show that the oxidation kinetics of the experimental alloy at 1 000 ℃ followed the parabolic law. The weight gain maintains a low level even after 500 h of oxidation. The outer oxide layer is Cr 2 O 3 with TiO 2 distributed in clusters outside the Cr2 O 3 layer and a small amount of TiN particles dispersed on the substrate. The whole oxide layer is complete and compact, and the alloy has excellent oxidation resistance. When the temperature rises to 1 100 ℃, spallation occurs after oxidation for 100 h. The outer oxide layer becomes loose and porous, the amounts and size of the inner nitrides increase significantly, and the oxidation resistance of the alloy deteriorates. The mechanism of the influence of temperature on the oxidation performance of the alloy is that the volatilization rate of Cr 2 O 3 increases with temperature. As the temperature increases to 1 100 ℃, the increased volatilization rate of Cr 2 O 3 increases the porosities of the oxide film, generates an impact on the oxide layer, and reduces the inhibition effect of oxygen and nitrogen, thus deteriorating the oxidation resistance.