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金属学报  2020, Vol. 56 Issue (7): 969-978    DOI: 10.11900/0412.1961.2019.00396
  本期目录 | 过刊浏览 |
张小丽1, 冯丽2, 杨彦红3, 周亦胄3, 刘贵群1()
1.北方民族大学材料科学与工程学院 银川 750021
2.沈阳职业技术学院电气工程学院 沈阳 110045
3.中国科学院金属研究所 沈阳 110016
Influence of Secondary Orientation on Competitive Grain Growth of Nickel-Based Superalloys
ZHANG Xiaoli1, FENG Li2, YANG Yanhong3, ZHOU Yizhou3, LIU Guiqun1()
1. School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China
2. Electrical Engineering, Shengyang Polytechnic College, Shenyang 110045, China
3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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关键词 镍基高温合金定向凝固晶粒竞争生长二次枝晶取向    

Directional solidification (DS) has been widely used to produce aero-engine and gas turbine blades of nickel-based superalloys. The preferred crystallographic orientation of nickel-based superalloys is [001], so the [001] columnar-grain structure can form after DS. Due to the low Young's modulus and the elimination of transverse grain boundaries, the [001] columnar-grain structure has beneficial mechanical behavior. The competitive grain growth dominates the production of columnar grains. There are two views about competitive grain growth, which are consistent for diverging grains but not consistent for converging grains. In the case of convergence of the first view, the grain boundary (GB) was parallel to the favorably aligned dendrites, which indicates that the favorably aligned grain cannot be eliminated. For converging grains of the second view, not only the favorably aligned dendrites could block unfavorably aligned ones, but also the unfavorably aligned dendrites could block favorably aligned ones. Thus, the converging grain boundary moved from unfavorably aligned grain to favorably aligned grain. Finally, the favorably aligned grain may be eliminated. The study about the two views was carried out in the case of the same secondary orientation but did not taken into account the secondary orientation. Up to now, the literatures about the effect of secondary dendrite orientation on competitive growth is rarely and their views contradict with each other. In this work, the bi-crystal and ter-crystal plates with different secondary orientations were produced to study the influence of secondary orientation on competitive grain growth. For the bi-crystal with the same primary orientation, as the secondary GB angle increased, the GB was nearly at the middle of the plate sample, which indicated that the competitive grain growth was weak and could be neglected. For the ter-crystal with different primary orientations, not the secondary orientation but the primary orientation could obviously affect competitive grain growth. In the case of converging grains, the change of secondary dendrite orientation had no effect on the competitive growth behavior and grain growth rate; the favorably and unfavorably aligned dendrites could block each other, which disagreed with Walton-Chalmers model and in good agreement with the results of Zhou. In the case of diverging grains, the result agreed with Walton-Chalmers model and Zhou's result.

Key wordsNi-based superalloys    directional solidification    competitive grain growth    secondary orientation
收稿日期: 2019-11-20     
ZTFLH:  TG132.3,TG21  
通讯作者: 刘贵群     E-mail:
Corresponding author: LIU Guiqun     E-mail:
作者简介: 张小丽,女,1984年生,博士


张小丽, 冯丽, 杨彦红, 周亦胄, 刘贵群. 二次枝晶取向对镍基高温合金晶粒竞争生长行为的影响[J]. 金属学报, 2020, 56(7): 969-978.
Xiaoli ZHANG, Li FENG, Yanhong YANG, Yizhou ZHOU, Guiqun LIU. Influence of Secondary Orientation on Competitive Grain Growth of Nickel-Based Superalloys. Acta Metall Sin, 2020, 56(7): 969-978.

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图 1  定向凝固过程中晶粒竞争生长机制示意图
图2  籽晶放置方式示意图
Seed patternExp.[001]orientation[010]/[010]orientation

Withdrawal speed


θA1 / (o)θB / (o)θA2 / (o)θA1 / (o)θB / (o)θA2 / (o)
表1  试样的结构特征和铸造条件
图3  一次枝晶取向相同时双晶的纵截面和横截面组织
图4  晶界偏离度(θGB)随二次晶界角的变化规律
图5  二次枝晶取向相同时三晶纵截面上的组织演化
图6  二次枝晶取向不同时三晶纵截面组织演化
图7  θGB随二次晶界角的变化规律
图8  定向凝固过程中枝晶的消失和再生
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