Microstructural stability of a nickel base single crystal alloy DD8 has been investigated.Standard heat treated specimen showed good microstructural stability at 950℃.While under the as-cast condition,a kind of rod-l...Microstructural stability of a nickel base single crystal alloy DD8 has been investigated.Standard heat treated specimen showed good microstructural stability at 950℃.While under the as-cast condition,a kind of rod-like phase precipitated in the interdendritic region of as-cast specimen during thermal exposure.The phase,which has bcc structure,was enriched with Cr.Thermo-calc also predicted precipitation of a bcc phase at around 950℃.The Cr-rich bcc phase was considered asα-Cr and formed due to the segregation of Cr under the as-cast condition.展开更多
文摘Microstructural stability of a nickel base single crystal alloy DD8 has been investigated.Standard heat treated specimen showed good microstructural stability at 950℃.While under the as-cast condition,a kind of rod-like phase precipitated in the interdendritic region of as-cast specimen during thermal exposure.The phase,which has bcc structure,was enriched with Cr.Thermo-calc also predicted precipitation of a bcc phase at around 950℃.The Cr-rich bcc phase was considered asα-Cr and formed due to the segregation of Cr under the as-cast condition.
