| 引用本文: | 费孝顺,赵玉涛,梁向锋,徐维台.一种新型高温合金在900和1 100 ℃下200 h的氧化行为[J].材料科学与工艺,2018,26(5):59-65.DOI:10.11951/j.issn.1005-0299.20170453. |
| FEI Xiaoshun,ZHAO Yutao,LIANG Xiangfeng,XU Weitai.Study on oxidation behavior of a new single-crystal superalloy at 900 and 1 100 ℃ for 200 h[J].Materials Science and Technology,2018,26(5):59-65.DOI:10.11951/j.issn.1005-0299.20170453. |
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| 摘要: |
| 涡轮叶片工作温度的不断提高，使得制备叶片的镍基单晶高温合金的合金化程度越来越高，而涡轮叶片在高温下的氧化行为影响着叶片的工作寿命.为此，本文以一种新型镍基高温合金为研究对象，利用氧化动力学曲线、X射线衍射分析，扫描电镜和能谱仪研究其在900和1 100 ℃下200 h的高温氧化行，并探究新型合金的氧化机理.研究发现：新型合金在900 ℃氧化时，表面氧化膜未发生剥落，动力学曲线遵循抛物线规律；在1 100 ℃氧化时，合金增重迅速且表面氧化膜剥落严重，新型合金内部出现了多层不连续的Al2O3内氧化层.研究结果表明：900 ℃时，新型合金中Cr含量降低的同时没有增加Re和Ta等活性元素，导致新型合金不能在氧化初期通过选择性氧化迅速形成保护性Cr2O3氧化膜，因此，增重迅速；1 100 ℃时，由于外氧化层的碎裂剥落，合金内部氧通量再次升高，已生成的Al2O3保护性氧化膜被消耗突破，合金进一步氧化，直到氧通量随着氧化的进行再次降低至适合Al2O3保护性氧化膜生成为止.
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| 关键词: 镍基高温合金 恒温氧化 内氧化 单晶 氧化动力学 |
| DOI：10.11951/j.issn.1005-0299.20170453 |
| 分类号:TG171 |
| 文献标识码:A |
| 基金项目:江苏省工业支撑重点项目(BE2014007)；江苏省重大关键技术项目(苏发改［2013］2027号). |
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| Study on oxidation behavior of a new single-crystal superalloy at 900 and 1 100 ℃ for 200 h |
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FEI Xiaoshun,ZHAO Yutao,LIANG Xiangfeng,XU Weitai
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(School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212000 , China)
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| Abstract: |
| As the operating temperature of the turbine blade continues to increase, the degree of alloying of the nickel-based single crystal superalloy for the blades become higher and higher. The oxidation behavior of turbine blades at high temperatures affects the working life of the blades. To this end, this article uses a new nickel-base superalloy as the research object, using oxidation kinetic curves, X-ray diffraction analysis, scanning electron microscopy and energy dispersive spectroscopy to study its high-temperature oxidation behavior at 900 and 1 100 ℃ for 200 h and oxidation mechanism of new alloys. It was found that when the new alloy was oxidized at 900 ℃, and the surface oxide film did not peel off and the kinetic curve followed the parabolic law. At 1 100 ℃, the alloy gained weight quickly and the surface oxide film peeled off seriously. A multi-layer discontinuous Al2O3 inner oxide layer appeared inside the alloy. The results showed that: at 900 ℃, the content of Cr in the new alloy decreased without increasing the active elements such as Re and Ta. As a result, the new type of alloy could not rapidly form a protective Cr2O3 oxide film by selective oxidation at the initial stage of oxidation. Therefore, weight was rapidly gained. At 1 100 ℃, due to the spalling of the outer oxide layer, the oxygen flux that had been reduced to a suitable selective oxidation of Al element increased again. The oxide protective film formed was consumed excessively, and the internal oxidation region in the alloy was further expanded until the oxygen flux decreases with oxidation again to generate a protective Al2O3 film.
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| Key words: Ni-based superalloy thermostatic oxidation internal oxidation single crystal oxidation kinetics |
