Microstructural Stability of a Single Crystal Superalloy DD8 during Thermal Exposure

材料科学技术（英文）, 2008, 24(1): 127-130.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.Superalloy Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;High Temperature Materials Group, KIMS, Changwon, Korea

2.Materials Test and Characterization Group, KIMS, Changwon, Korea

3.High Temperature Materials Group, KIMS, Changwon, Korea

4.High Temperature Materials Group, KIMS, Changwon, Korea

5.Superalloy Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

6.Superalloy Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

基金项目: Korean Ministry of Science & Technology(K20711000001-07A0100-00110)

Microstructural Stability of a Single Crystal Superalloy DD8 during Thermal Exposure

K.Y. Cheng ^1, , D.H. Kim ^2, , Y.S. Yoo ^3, , C.Y. Jo ^4, , T. Jin ^5, , Z.Q.Hu ^6,

1.Superalloy Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;High Temperature Materials Group, KIMS, Changwon, Korea

2.Materials Test and Characterization Group, KIMS, Changwon, Korea

3.High Temperature Materials Group, KIMS, Changwon, Korea

4.High Temperature Materials Group, KIMS, Changwon, Korea

5.Superalloy Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

6.Superalloy Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Keywords： DD-8

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 as α-Cr and formed due to the segregation of Cr under the as-cast condition.

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