超超临界电站用镍铁基高温合金TCP相和碳化物相析出的热力学计算
Thermodynamic Calculations of Precipitation of TCP Phase and Carbide Phase of Ni-Fe Base Superalloys for Ultra-supercritical Power Plants
查看参考文献22篇
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文摘
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利用材料相图与性能模拟计算软件JMatPro,研究了难熔元素W,Mo,Nb和Fe含量的变化对一种新型镍铁基高温合金拓扑密排相(TCP)和碳化物相析出及高温性能的影响。结果表明:新型镍铁基高温合金晶内强化相为γ′相,晶界为M_(23)C_6碳化物;在合金中添加Mo,W,Nb均可提高合金的持久强度和屈服强度;增加合金中Mo,Nb,Fe的含量会提高Laves相和σ相的析出温度;为避免在长期服役过程中合金析出较多的TCP相,在合金中添加不超过0.6%(质量分数,下同)的Nb或不超过1%的Mo和W,以使TCP相的析出温度尽可能低于使役温度。 |
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其他语种文摘
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Thermodynamic calculations for studying the influence of elements W, Mo, Nb and Fe on precipitation of topologically close-packed phases(TCP) and carbide phases,high temperature mechanical properties of a new Ni-Fe base superalloy were carried out using material phase diagrams and by JMatPro thermodynamic software. The results show that the main strengthening phases are γ′ and M_(23)C_6 at inner grain and grain boundaries, respectively. The additions of Mo,W and Nb into the superalloy are beneficial to improve the high temperature creep rupture life and yield strength. Meanwhile, the increments of Mo, Nb and Fe could promote the precipitation tendency of Laves and σ phase. Therefore, in order to avoid the appearance of TCP phases in this superalloy, the addition of Nb mass fraction should be less than 0.6%, and the additions of Mo and W should be no more than 1.0%. |
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来源
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材料工程
,2015,43(5):38-43 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2015.05.007
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关键词
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超超临界
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镍铁基高温合金
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热力学计算
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析出相
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地址
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1.
西安热工研究院有限公司, 西安, 710032
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中国科学院金属研究所, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:5429467
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