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金属学报  2017, Vol. 53 Issue (4): 423-432    DOI: 10.11900/0412.1961.2016.00291
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中国科学院金属研究所 沈阳 110016
Effect of Ru on the Solidification Microstructure of a Ni-Based Single Crystal Superalloy with High Cr Content
Likui NING(),Jian TONG,Enze LIU,Zheng TAN,Huisi JI,Zhi ZHENG
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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关键词 单晶高温合金Ruβ-NiAl相逆分配偏析    

Ni-based single crystal superalloys have been widely used in manufacturing the critical components of aero-engines, such as turbine blades and vanes. Improvements in phase stability on the addition of Ru are well known in the field of Ni-based superalloy development. Cr is beneficial to hot co-rrosion resistance of Ni-based superalloys. Generally, superalloys which used under easy corrosion conditions should contain high levels of Cr. Early researches about the influence of Ru on solidification microstructures in Ni-based single crystal alloys are mostly focused on low-Cr systerms (<6%). Since Cr has complex interactions with Ru, it is meanful to study the effects of Ru on solidification microstructures in high-Cr (>10%) Ni-based single crystal superalloy systems. The materials used in this work are Ni-based single crystal superalloy with high Cr content. Three superalloys by changing Ru addition (0, 1.5%, 3%, mass fraction) were designed. By observing the as-cast structure, the effect of Ru on the elements distribution and the precipitation characters of different phases in these alloys were studied. It is found that as the Ru content increases, the primary and secondary dendrite arm spacings decrease gradually; the volume fraction of (γ+γ′) eutectic increases firstly and then decreases; the γ′ size is reduced progressively. The addition of 3%Ru leads to the formation of β-NiAl phase, which contain a certain amount of Cr, Co and Ru except the basic elements Ni and Al. The typical "reverse partitioning" of other alloying elements is exhibited with the addition of Ru, while the formation of β-NiAl phase can reduce the "reverse partitioning" of other alloying elements. The addition of Ru could enhance the segregation of positive segregation elements Ta, Al and negative segregation element Re while reduce the segregation of positive segregation elements Mo and Cr.

Key wordssingle crystal superalloy    Ru    β-NiAl phase    reverse partitioning    segregation
收稿日期: 2016-07-08      出版日期: 2017-04-07
基金资助:国家自然科学基金项目 No.51501193


宁礼奎,佟健,刘恩泽,谭政,纪慧思,郑志. Ru对一种高Cr镍基单晶高温合金凝固组织的影响[J]. 金属学报, 2017, 53(4): 423-432.
Likui NING,Jian TONG,Enze LIU,Zheng TAN,Huisi JI,Zhi ZHENG. Effect of Ru on the Solidification Microstructure of a Ni-Based Single Crystal Superalloy with High Cr Content. Acta Metall Sin, 2017, 53(4): 423-432.

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图1  3种不同Ru含量合金的铸态组织
图2  Ru含量与枝晶间距的关系
图3  3种不同含Ru量合金的升温DSC曲线
图4  3种不同含Ru量合金的典型铸态SEM像
图5  1.5Ru合金中板状共晶形貌及EDS分析
图6  3Ru合金中新相的形貌及其EDS分析
图7  3Ru合金中新相TEM像和SAED谱
Alloy TS TL ΔT0
0Ru 1334 1381 47
1.5Ru 1336 1381 45
3Ru 1335 1380 45
表1  3种不同Ru含量的合金在DSC升温曲线上获得的相变温度
图8  3Ru合金中β-NiAl相的SEM像及元素面分布
图9  3种不同Ru含量合金的铸态γ'相形貌
Alloy Eutectic β-NiAl Eutectic+β-NiAl
0Ru 0.45 - 0.45
1.5Ru 0.75 - 0.75
3Ru 0.39 0.99 1.38
表2  3种不同Ru含量合金中(γ+γ')共晶和β-NiAl相的体积分数
Alloy Re Mo Ru W Cr Co Al Ta Ni
0Ru 0.260 0.574 - 2.073 6.378 6.698 7.889 10.371 65.757
1.5Ru 0.361 0.640 1.264 2.208 5.619 6.663 7.667 11.937 63.641
3Ru 0.576 0.951 2.507 2.623 8.238 7.442 6.883 10.966 59.814
表3  3种合金中(γ+γ')共晶相成分的比较
图10  3种不同Ru含量合金中各元素在γ /γ'相中的分配比
图11  3种不同Ru含量合金中各元素的偏析系数K
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