摘要
优化设计了4种不同Re含量的耐腐蚀定向镍基高温合金,含Re分别为0%,1%,2%和3%(质量分数)。对比了不同Re含量合金的铸态枝晶、γ'相形貌及持久性能试样的断口筏排化组织,测试了不同Re含量合金热处理态的980℃/200 MPa持久寿命,研究了Re对耐腐蚀镍基定向合金组织及持久寿命的影响。研究表明:随着Re含量的增加,合金的一次枝晶间距减小;γ'相尺寸减小,立方化程度增加;蠕变试样的筏排组织更加细化、完善与稳定,因此,合金持久寿命提高。
Four Ni-based superalloys with varying rhenium contents （0%, 1%, 2% and 3% （mass fraction）, respectively） were prepared to investigate the effects of Re content on the microstructure and the stress-rupture life of the superalloys. The as-cast primary dendritic arm spacing of the four alloys were compared, and the precipitates of as-cast and aged alloys were studied. The stress-rup- ture life at 980 ℃/200 MPa were tested and the rafting microstructure were analyzed with varying Re contents. The results showed that with the increase of Re contents, the primary dendritic arm spacing decreased; the size of the secondary y^1 precipitates decreased; and the morphology of y^1 precipitates became more cubic due to the enlargement of lattice misfit moreover, well rafting microstructure formed with larger driving force because of larger lattice misfit. As a result, the stress-rupture increased.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2012年第4期547-551,共5页
Chinese Journal of Rare Metals
基金
重点实验室基金项目(9140C4301050801)
国家自然科学基金项目(50801058)
国家航空基金项目(20085321009)
国家工信部科技专项基金项目(2009ZX04006-041)资助
关键词
耐腐蚀高温合金
RE
微观组织
持久寿命
corrosion resistant superalloy
rhenium
microstructure
stress-rupture life
