Influence of Withdrawal Rate on Tensile and Stress Rupture Properties of the Single Crystal Superalloy DD9
The third generation single crystal superalloy DD9 was processed with different withdrawal rates and the effect of withdrawal rate on the tensile and stress rupture properties of the alloy was investigated.The relation between the mechanical properties and microstructure of the alloy with different withdrawal rates was discussed.The results showed that the withdrawal rate had a little effect on the tensile properties at 25℃ of the alloy.The tensile strength at 980℃ and stress rupture life at 1120℃/140MPa of DD9 alloy all increased with the increasing of withdrawal rate.The γ′ precipitates of specimen tensile at 25℃ had a little extension in the stress orientation.The extension of γ′ precipitates in the stress orientation at 980℃ was much more than that at 25℃.The vertical γ matrix at 980℃ became thinner and horizontal γ matrix became thicker slightly.The γ′ precipitates of those had rafted in a direction transverse to the applied stress.
DD9:Single crystal superalloy:Withdrawal Rate:Mechanical properties
Z.X.Shi J.R.Li S.Z.Liu
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
625-628
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）