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材料工程  2019, Vol. 47 Issue (2): 76-83    DOI: 10.11868/j.issn.1001-4381.2018.000767
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
微量Hf对大角度晶界含Re双晶合金高温持久性能的影响
赵云松1, 郭媛媛1, 赵敬轩2, 张晓铁3, 刘砚飞1, 杨岩1, 姜华1, 张剑1, 骆宇时1
1. 中国航发北京航空材料研究院 先进高温结构材料重点实验室, 北京 100095;
2. 北京科技大学 材料科学与工程学院, 北京 100083;
3. 北京航空航天大学 材料科学与工程学院, 北京 100191
Effects of minor Hf on high temperature stress rupture properties of high angle grain boundary in a Re-containing Ni-based bicrystal superalloy
ZHAO Yun-song1, GUO Yuan-yuan1, ZHAO Jing-xuan2, ZHANG Xiao-tie3, LIU Yan-fei1, YANG Yan1, JIANG Hua1, ZHANG Jian1, LUO Yu-shi1
1. Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3. School of Materials Science and Engineering, Beihang University, Beijing 100083, China
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摘要 采用籽晶法制备含有大角度晶界(约20°)的双晶试板,通过分析不同Hf含量(质量分数:0%,0.4%)的含Re合金晶界处析出相、γ/γ'组织、晶界成分及1100℃/100MPa横向持久性能,研究Hf对晶界组织及高温力学性能的影响。结果表明:Hf显著提高了铸态合金大角度晶界处共晶和碳化物体积分数;热处理后,Hf显著抑制了晶界胞状再结晶组织的形成,含Hf合金的1100℃/100MPa横向持久寿命均显著提高。晶界持久性能与晶界析出相种类、形貌、含量和成分密切相关,而Hf元素在晶界未发现显著的偏聚。本研究对先进镍基单晶合金中晶界缺陷的评价及Hf元素晶界强化作用机制的认识具有一定的指导意义。
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赵云松
郭媛媛
赵敬轩
张晓铁
刘砚飞
杨岩
姜华
张剑
骆宇时
关键词 单晶高温合金Hf晶界显微组织持久性能    
Abstract:Two bicrystal specimens containing high angle grain boundary (about 20 degrees) were prepared by seed crystal method. The effect of Hf on the as-cast, heat-treated grain boundary microstructure, composition and stress rupture properties under 1100℃/100MPa was investigated in Ni-based single crystal superalloy contained Re with different contents of Hf (mass fraction:0%, 0.4%). The results show that Hf addition results in the increase of the volume fraction of (γ+γ') eutectic and MC along the grain boundary. The volume fraction of cellular recrystallization microstructure is significantly decreased after heat treatment with Hf addition. The transverse stress rupture life is observed to increase significantly under 1100℃/100MPa in the Hf-containing alloy. The stress rupture properties are closely related to the type, morphology, content and composition of the precipitation phase along grain boundary, but the obvious segregation of Hf is not observed. This study can be helpful for the understanding of Hf's role of strengthening mechanism in grain boundary in advanced Ni-based single crystal superalloy.
Key wordssingle crystal superalloy    Hf    grain boundary    microstructure    stress rupture property
收稿日期: 2018-06-26      出版日期: 2019-02-21
中图分类号:  TG132.3+2  
通讯作者: 赵云松(1987-),男,工程师,博士,研究方向:铸造高温合金,联系地址:北京81信箱1分箱(100095),E-mail:yunsongzhao@163.com     E-mail: yunsongzhao@163.com
引用本文:   
赵云松, 郭媛媛, 赵敬轩, 张晓铁, 刘砚飞, 杨岩, 姜华, 张剑, 骆宇时. 微量Hf对大角度晶界含Re双晶合金高温持久性能的影响[J]. 材料工程, 2019, 47(2): 76-83.
ZHAO Yun-song, GUO Yuan-yuan, ZHAO Jing-xuan, ZHANG Xiao-tie, LIU Yan-fei, YANG Yan, JIANG Hua, ZHANG Jian, LUO Yu-shi. Effects of minor Hf on high temperature stress rupture properties of high angle grain boundary in a Re-containing Ni-based bicrystal superalloy. Journal of Materials Engineering, 2019, 47(2): 76-83.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000767      或      http://jme.biam.ac.cn/CN/Y2019/V47/I2/76
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