| 引用本文: | 王岩,曾莉,苗华军,李亮,郝文慧.700 ℃超超临界锅炉材料GH4700镍基合金Al2O3+TiN复合析出行为研究[J].材料科学与工艺,2013,21(3):122-128.DOI:10.11951/j.issn.1005-0299.20130319. |
| WANG Yan,ZENG Li,MIAO Hua-jun,LI Liang,HAO Wen-hui
.Research on the precipitation behaviors of Al2O3+TiN in the GH4700 nickel-base superalloy for 700 ℃ ultra-supercritical boilers[J].Materials Science and Technology,2013,21(3):122-128.DOI:10.11951/j.issn.1005-0299.20130319. |
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| 摘要: |
| 运用金相、扫描、热力学与动力学计算的方法,对真空感应冶炼GH4700镍基高温合金中Al2O3+TiN复合析出行为进行研究,结果表明：Ti、N、O的偏析因子对冷速不敏感；合金中以Al2O3+TiN复合夹杂为主；纯TiN只能在固相分数大于95%的两相区开始生成,尺寸约为4.5~5μm,与实际观察的尺寸基本吻合,而对于Al2O3+TiN复合夹杂物,尺寸及分布范围较纯TiN析出物要宽. |
| 关键词: 超超临界 TiN 热力学 动力学 |
| DOI：10.11951/j.issn.1005-0299.20130319 |
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| Research on the precipitation behaviors of Al2O3+TiN in the GH4700 nickel-base superalloy for 700 ℃ ultra-supercritical boilers |
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WANG Yan, ZENG Li, MIAO Hua-jun, LI Liang, HAO Wen-hui
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(State Key Laboratory of Advanced Stainless Steel, Taiyuan iron and Steel Group Company Limited,Taiyuan 030003, China)
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| Abstract: |
| The precipitation behaviors of Al2O3+TiN in the GH4700 nickel-base superalloy were researched by using optical microscope, scanning electron microscopy, thermodynamic and kinetic calculation. The results show that: The segregation factor of Ti, N and O is not sensitive to the cooling rate; The mainly inclusion in the superalloy is Al2O3+TiN compound inclusion; The pure TiN is generated in the two phase region in the condition of solid fraction is more than 95%, the size of TiN is about 4.5~5μm, in agreement with that measured results in the experiment, but for the Al2O3+TiN compound inclusion, the size distribution scope is larger than pure TiN precipitates. |
| Key words: advanced ultra-supercritical TiN thermodynamics kinetics |
