Effect of Re content on precipitation behaviour of secondary phases in a single-crystal Ni-based superalloy during high-temperature thermal exposure
The precipitation of secondary phases in single-crystal Ni-based superalloys with different contents of Re arc investigated using TEM and SEM.The results show that after full heat treatment, the size of secondary γphase decreases gradually with increasing Re content.During long-term thermal exposure at 1093℃, some needle-like and rod-like secondary phases precipitate from the y matrix.With increasing Re content and prolonging of the thermal exposure, the amounts of precipitated phases clearly increase.In the alloy with 2.5 wt-% Re, the needle-like phases are identified as M6C carbides.In the alloy with 3 wt-% Re, both M6C carbides and μ phase are found.In alloy with 3.5 wt% Re, the needle-like and rod-like precipitated phases are all identified as μ and P phases.Stacking fault was found in the P phase and that part was identified as μ phase by SAED;that is, there is intergrowth of P and μ phases.
single-crystal superalloy rhenium precipitated phase thermal exposure
L.R.Liu Y.F.Pu S.G.Tian Z.Y.Zhang T.Jin
Materials Science and Engineering School, Shenyang University of Technology, Shenyang, 110870, China Department of Superalloys, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
国际会议
长沙
英文
230-234
2016-10-16（万方平台首次上网日期，不代表论文的发表时间）