| 李强,杜三才,缪煜清,李荣斌.气体氮化γ-TiAl合金的抗高温氧化性能研究[J].有色金属材料与工程,2024,45(5):26-32. |
| 气体氮化γ-TiAl合金的抗高温氧化性能研究 |
| Study on the high temperature oxidation resistance of gas nitrided γ-TiAl alloy |
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| DOI：10.13258/j.cnki.nmme.20240929001 |
| 中文关键词: γ-TiAl合金 气体氮化 显微组织 维氏硬度 高温氧化 |
| 英文关键词:γ-TiAl alloy gas nitriding microstructures Vickers hardness high-temperature oxidation |
| 基金项目:上海电机学院上海大件热制造工程技术研究中心开放基金（18DZ2253400） |
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| 摘要点击次数: 1871 |
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| 中文摘要: |
| γ-TiAl基合金抗高温氧化性较差限制了其在高温场景下的应用，提高其抗高温氧化性能对高温合金的研究与应用具有重要意义。以Ti-48Al-2Cr-2Nb合金为研究对象，将其置于管式炉中分别在800、900、1 000 ℃下进行气体氮化2 h。采用光学显微镜观察显微组织，采用X射线衍射仪分析物相组成，测试维氏硬度，分析900 ℃下的高温氧化行为。结果表明，随着氮化温度的升高，合金基体片层组织逐渐粗化，表面膜层增厚，维氏硬度升高。在空气中高温氧化128 h后，800 ℃和900 ℃氮化后样品的质量增加仅为未氮化样品的25.3%和28.9%，表明800 ℃和900 ℃氮化后的样品具有良好的抗氧化能力。由于1 000 ℃氮化样品因膜层存在裂纹，高温氧化时膜层和基体会与氧发生反应生成氧化物，导致质量增加显著。900 ℃下氮化处理能够显著提高Ti-48Al-2Cr-2Nb合金的表面维氏硬度，增强合金的抗氧化能力。 |
| 英文摘要: |
| The poor high-temperature oxidation resistance of γ-TiAl-based alloys limits their applications in high-temperature environments. Enhancing their oxidation resistance is of significant importance for the researches and applications of superalloys. Ti-48Al-2Cr-2Nb alloy was taken as the research object in this study, and subjected to gas nitriding in a tubular furnace at the temperatures of 800, 900, 1 000 ℃ for 2 hours, respectively. The microstructure was observed by optical microscopy, the phase composition was analyzed by X-ray diffractometer, the Vickers hardness was measured, and the high-temperature oxidation behavior at 900 ℃ was analyzed. The results indicate that with the increase of nitriding temperature, the lamella structure of the alloy matrix gradually coarsens, the surface layer thickens, and the Vickers hardness increases. After high-temperature oxidation in air for 128 hours, the weight gains of the samples nitrided at 800 ℃ and 900 ℃ were only 25.3% and 28.9% of that of sample without nitriding, indicating that the samples nitrided at 800 and 900 ℃ have good antioxidant capacity. Due to the presence of cracks in the film layer of the 1 000 ℃ nitrided sample, the film layer and substrate react with oxygen to form oxides during high-temperature oxidation, resulting in a significant increase in weight. Nitriding treatment at 900 ℃ can significantly improve the surface Vickers hardness of Ti-48Al-2Cr-2Nb alloy and enhance its oxidation resistance. |
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