Influence of long-term isothermal aging on microstructure and creep rupture properties of Ni-base superalloy M4706长期等温时效对镍基高温合金M4706 组织和持久蠕变性能的影响

被引：0
作者：
Yu-hao Duan
Peng Zhang
Jiao Li
Bo Li
Xiao-long Song
Xiu-fang Gong
Gong-xian Yang
机构：
[1] Xi’an Jiaotong University,State Key Laboratory for Mechanical Behavior of Materials
[2] Xi’an Thermal Power Research Institute Co.,Instrumental Analysis Center
[3] Ltd.,State Key Laboratory for Long
[4] Xi’an Jiaotong University,life High Temperature Materials
[5] Dongfang Turbine Co.,undefined
[6] Ltd.,undefined
来源：
Journal of Central South University | 2020年 / 27卷
关键词：
Ni-base superalloy; isothermal aging; microstructure; creep rupture properties; 镍基高温合金; 等温时效; 微观组织结构; 持久蠕变性能;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
After a standard heat treatment, the microstructural evolution with time during isothermal aging at 850 °C and its effect on the creep rupture properties of the Ni-base superalloy M4706 at 870 °C and 370 MPa are investigated. It is found that as the aging time increases from 0 to 5000 h, the average diameter of coarse γ’ increases from 241 to 484 nm, and the distribution of the carbides at grain boundaries changes from discontinuous to continuous. Moreover, experimental observations on the microstructures of all the crept specimens reveal that dislocation bypassing controls the creep deformation. Thus, it is concluded that the transitions in the microstructures result in the degeneration of the creep rupture properties of the experimental alloy with aging time.
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页码：325 / 333
页数：8
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