重庆大学学报2017，Vol.40Issue(6)：1-7,7.DOI:10.11835/j.issn.1000-582X.2017.06.001
应力时效对镍基单晶合金DD11组织及持久性能的影响
Effect of stress aging on the microstructure and stress-rupture properties of a single crystal superalloy DD11
摘要
Abstract
The effect of uniaxial stress aging at 1 070 ℃/100 MPa on the microstructural evolution and the stress rupture properties of a single crystal supperalloy DD11 was investigated.The microstructure before and after the stress aging was observed with scanning electron microscope and transmission electron microscope,and the stress rupture properties before and after the stress aging were also tested.The experiment results show that the evolution of the microstructure can be divided into two stages,rafting (first 50 h) and coarsening (after the first 50 h) of the rafting microstructure.At the first stage,the vertical direction of the γ phase channels becomes narrow or disappears gradually,and the width of horizontal direction of the γ phase channels increases gradually.At the same time,the cuboidal γ'phase expands horizontally and gradually connects with each other.At the second stage,the dimension of the rafts coarsens slightly.However,the morphology of rafting keeps stable.The stress rupture properties of 1 070℃/140 MPa decrease slightly at first stage and degrade gradually at second stage.After stress aging for 500 h,the stress rupture properties decline from initial 360 h to 140 h.The results show that the key factors for the degeneration of the stress rupture properties are the coarsening of the matrix channels and the rafting of the microstructure.关键词
单晶高温合金/DD11/应力时效/筏排/持久寿命Key words
single crystal superalloy/DD11/stress aging/raft/stress rupture property分类
矿业与冶金引用本文复制引用
刘晨光,赵云松,唐定中,李春志,赵振业..应力时效对镍基单晶合金DD11组织及持久性能的影响[J].重庆大学学报,2017,40(6):1-7,7.基金项目
国家高技术研究发展计划资助项目(2012AA03A513).Supported by National High Technology Research and Development Program (2012AA03A513). （2012AA03A513）
