晶界角度对一种镍基双晶高温合金持久性能的影响*
收稿日期: 2013-06-24
修回日期: 2013-06-24
网络出版日期: 2014-01-11
基金资助
* 国家自然科学基金项目U1037601, 51271186 和51001103, 国家重点基础研究发展计划项目2010CB631206 及中国科学院百人计划项目资助
EFFECT OF GRAIN BOUNDARY ANGLE ON STRESS RUPTURE PROPERTIES OF A Ni-BASED BICRYSTAL SUPERALLOY
曹亮, 女, 1981 年生, 博士生
Received date: 2013-06-24
Revised date: 2013-06-24
Online published: 2014-01-11
Supported by
Supported by National Natural Science Foundation of China (Nos.U1037601, 51271186 and 51001103), National Basic Research Program of China (No.2010CB631206) and Program of “One Hundred Talented People” of the Chinese Academy of Sciences
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 . DOI: 10.3724/SP.J.1037.2013.00342
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.
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