| 姚罡,付明杰.TNW700高温钛合金热过程中的相组织变化分析[J].材料导报,2018,32(20):3584-3589 |
| TNW700高温钛合金热过程中的相组织变化分析 |
| Analysis of Phase Change in the Thermal Process of TNW700 High-temperature Titanium Alloy |
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| DOI：10.11896/j.issn.1005-023X.2018.20.016 |
| 中文关键词: TNW700 高温钛合金 原位XRD 相转变 |
| 英文关键词: TNW700, high-temperature titanium alloy, in-situ X-ray diffraction, phase transition |
| 基金项目:航空基金(KH361508116) |
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| 摘要点击次数: 1808 |
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| 中文摘要: |
| 本工作利用EPMA、SEM、EDS等测试手段分析了TNW700高温钛合金的相组织形态和元素分布,并利用原位X射线衍射(XRD)测试技术对该合金升温过程和热暴露过程中发生的相转变和表面氧化物进行了分析。结果表明TNW700高温钛合金是一种高铝当量合金,通过硅化物和α2的析出强化共同提高其抗蠕变持久性能。在升温过程中,600 ℃时Zr元素开始固溶至Ti中,并在900 ℃达到饱和；从880 ℃开始TiC、Ti3Al相随着温度升高而增多；700 ℃热暴露实验表明TNW700钛合金表面生成的氧化物以Ti6O、Ti3O为主,氧化物增加缓慢,没有大量的TiO2和Al2O3出现,合金短时内有良好的抗表面氧化性能。 |
| 英文摘要: |
| In this paper, the phase and element distribution of TNW700 titanium alloys were analyzed by means of EPMA (Electron probe microanalysis), SEM, EDS, etc. The phase transition and surface oxides of the alloy during heating process and thermal exposure were analyzed by using in-situ X-ray diffraction (XRD) technique. The result showed that the TNW700 titanium alloy is a high aluminum-equivalent alloy whose creep durability can be improved by the synergistic effect of precipitation strengthening of silicon and α2 phase. During the heating process, zirconium begins to dissolve into titanium forming solid solution at 600 ℃, and reaches saturation at 900 ℃ saturated. TiC and Ti3Al phases increase with the rising temperature exceeding 880 ℃. 700 ℃thermal exposure test confirmed that the generated surface oxides are mainly Ti6O and Ti3O with a low increment rate and only a little TiO2 and Al2O3 generated. It seems that the TNW700 alloy exhibits a satisfactory short-term resistance to high-temperature surface oxidation. |
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