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金属学报  2014, Vol. 50 Issue (1): 11-18    
  论文 本期目录 | 过刊浏览 |
晶界角度对一种镍基双晶高温合金持久性能的影响*
曹 亮 周亦胄 金 涛 孙晓峰
(中国科学院金属研究所, 沈阳 110016)
EFFECT OF GRAIN BOUNDARY ANGLE ON STRESS RUPTURE PROPERTIES OF A Ni-BASED BICRYSTAL SUPERALLOY
CAO Liang, ZHOU Yizhou, JIN Tao, SUN Xiaofeng
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
全文: PDF(16445 KB)   HTML
摘要: 

研究了晶界角度对一种镍基双晶高温合金持久性能的影响. 结果表明, 双晶试样的持久性能低于单晶试样. 随着晶界角度的增加, 试样的持久性能降低, 断裂方式逐步由穿晶断裂向沿晶断裂过渡. 随着温度的升高, 由穿晶断裂过渡到沿晶断裂的临界晶界角度变小. 871 ℃, 552 MPa条件下, 12°晶界断口开始出现沿晶断裂特征; 1100 ℃, 120 MPa条件下, 4.5°晶界断口开始出现沿晶断裂特征.

关键词 镍基高温合金晶界角度持久性能    
Abstract

Bicrystal slabs with different grain boundary angles were cast to study the effect of varied grain boundary angle on stress rupture properties of a Ni-based bicrystal superalloy. It was found that the stress rupture lives of single crystal specimens were superior to those with grain boundaries. With the increase of grain boundary angle, the stress rupture life was decreased and the fracture type was transferred from trans-granular to inter-granular fracture. The reduced rupture properties was attributed to the inhabitation of grain boundary on slip deformation. With the rise of temperatures, the effect of grain boundaries on rupture properties was enhanced and the critical value of grain boundary angle from trans-granular to inter-granular fracture was decreased. Inter-granular fracture occurred from 12° grain boundary in the rupture test of 871 ℃ and 552 MPa, and it occurred from 4.5° grain boundary in the rupture test of 1100 ℃ and 120 MPa. Since the grain boundary became weaker at higher temperature, the angle of low-angle boundary in single crystal superalloys should be controlled strictly.

Key wordsNi-based superalloy    grain boundary angle    stress rupture property
收稿日期: 2013-06-24     
ZTFLH:  TG146  
Corresponding author: ZHOU Yizhou, professor, Tel: (024)83978068, E-mail: yzzhou@imr.ac.cn   

引用本文:

曹亮, 周亦胄, 金涛, 孙晓峰. 晶界角度对一种镍基双晶高温合金持久性能的影响*[J]. 金属学报, 2014, 50(1): 11-18.
CAO Liang, ZHOU Yizhou, JIN Tao, SUN Xiaofeng. EFFECT OF GRAIN BOUNDARY ANGLE ON STRESS RUPTURE PROPERTIES OF A Ni-BASED BICRYSTAL SUPERALLOY. Acta Metall Sin, 2014, 50(1): 11-18.

链接本文:

https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y2014/V50/I1/11

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