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金属学报  2014, Vol. 50 Issue (7): 854-862    DOI: 10.3724/SP.J.1037.2013.00790
  论文 本期目录 | 过刊浏览 |
C对单晶高温合金持久性能的影响*
余竹焕1), 刘林2)
1) 西安科技大学材料科学与工程学院, 西安 710054
2) 西北工业大学凝固技术国家重点实验室, 西安 710072
EFFECT OF C ON THE RUPTURE PROPERTIES OF SINGLE CRYSTAL SUPERALLOYS
YU Zhuhuan 1), LIU Lin 2)
1) Department of Materials Science and Engineering, Xi′an University of Science and Technology, Xi′an 710054
2) State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an 710072
全文: PDF(13024 KB)   HTML
摘要: 

研究了5种不同含量的C对单晶高温合金凝固组织及持久性能的影响. 结果表明, 随着C含量的增加, 共晶数量明显减少, 碳化物数量增多, 且碳化物主要分布在枝晶间区域, 当C含量较高时, 在枝晶干上也有少量碳化物出现. 经过热处理后, 合金的枝晶间粗大的g /g ′共晶基本消除, 枝晶间少量未被固溶掉的g /g ′共晶, 达到了较好的均匀化效果; 碳化物形貌比铸态更为简单, 尺寸明显减小, 体积分数减小, 且分布更加弥散, 碳化物类型更加丰富, 出现了粒状和链状的M23C6碳化物. 随C含量增加合金的高温持久寿命先增大后减小, 当C含量为0.045%时, 高温持久寿命最大. 引起持久性能变化的主要原因是由于合金中未消除的共晶、碳化物及缩松的存在, 未消除的共晶以及碳化物都是裂纹萌生的位置, 而共晶和碳化物的数量随着C含量的增大又呈相反的变化趋势, 因此C的加入要适量.

关键词 C单晶高温合金微观组织持久寿命    
Abstract:The effects of carbon addition on the solidification microstructure and rupture life were investigated in five different carbon level single crystal superalloys. With the increasing of carbon level, the volume fraction of eutectic decreased markedly and the volume fraction of carbide increased. The carbides mainly distributed in interdendrite zone, when the carbon level was high, there were little carbides in the dendrite core. After heat treatment, coarse g /g ′ eutectics in interdendrte zone mainly were dissolved, a little g /g ′ eutectic was not dissolved. Morphologies of carbide became much simpler, the size of carbide decreased, the volume fraction of carbide decreased, and the distribution of carbide became much more dispersion, and the type of carbide became much more variety. Grain and chainlike M23C6 appeared after heat treatment. With the increasing of carbon level, the rupture life of single crystal superalloy increased at first and then decreased, and the rupture life came up to the maximum when the carbon level was 0.045%. SEM observation indicates that the cracks of alloys mainly originate from shrinkage, carbides and eutectics. The change of rupture life was mainly because the un-dissolved eutectic and carbides of alloy which act as the source of cracks. The variation trend of carbide and eutectic was contrary with the increasing of carbon level; therefore, the carbon content should be controlled in the perfect level.
Key wordsC    single crystal superalloy    microstructure    rupture life
收稿日期: 2013-12-04     
ZTFLH:  TG146  
基金资助:* 国家自然科学基金项目51201130, 国家重点基础研究发展计划项目2010CB631201, 陕西省自然科学基金项目2012JQ6005, 西安科技大学博士启动金项目2011QDJ023和凝固技术国家重点实验室开放课题项目 SKLSP201226资助
Corresponding author: YU Zhuhuan, associate professor, Tel: (029)85587373,
E-mail: yzh0709qyy@163.com   
作者简介: 余竹焕, 女, 1978年生, 副教授

引用本文:

余竹焕, 刘林. C对单晶高温合金持久性能的影响*[J]. 金属学报, 2014, 50(7): 854-862.
YU Zhuhuan, LIU Lin. EFFECT OF C ON THE RUPTURE PROPERTIES OF SINGLE CRYSTAL SUPERALLOYS. Acta Metall Sin, 2014, 50(7): 854-862.

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00790      或      https://www.ams.org.cn/CN/Y2014/V50/I7/854

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