Effect of melting temperature on the microstructure stability of a Ni-based single crystal superalloy
The single crystal superalloy with 001 orientation were prepared by screw selecting method in the directionally solidified furnace.Three different melting temperature 1570℃,1620℃ and 1670℃ were used in the melting process,respectively.The long term aging of the specimens after full heat treatment were performed at 1100℃ for 800h.The effect of melting temperature on the microstructure stability of the alloy was investigated.The results showed that the primary dendrite arm spacing of alloy decreased with the increasing of melting temperature.The size of γ′ phase particles in these two regions decreases and cubic shape of those turns a little regular with increasing of melting temperature.The difference of γ′ size between the dendrite core and the interdendritic region reduces.The size of γ′ phase particles after heat treatment decreases with increasing of melting temperature.The extent of elements segregation decreases with increasing of melting temperature.The needle shaped TCP phases have already been observed in all of specimens and the amount of TCP phases decreases with increasing of melting temperature.Increase melting temperature of the single crystal superalloy with high refractory content can increase high temperature phase stability.
single crystal superalloy melting temperature microstructure stability TCP phase
Zhen-xue Shi Shi-zhong Liu Xiao-guang Wang Xiao-dai Yue Jia-rong Li
Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China
国际会议
2014 Asia-Pacific International Symposium on Aerospace Technology(2014亚太航空航天技术学术会议)
上海
英文
1-6
2014-09-24（万方平台首次上网日期，不代表论文的发表时间）