Anisotropic Creep Rupture Properties of a Nickel-base Single Crystal Superalloy at High Temperature

材料科学技术（英文）, 2011, 27(2): 107-112.

^1, , ^2, , ^3,

1.Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

2.Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China

3.Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

基金项目: The project was sponsored by the National Basic Research Program of China(2010CB631201) the National Natural Science Foundation of China(50931004)

Anisotropic Creep Rupture Properties of a Nickel-base Single Crystal Superalloy at High Temperature

Shaohua Zhang ^1, , Jian Zhang ^2, , Langhong Lou ^3,

1.Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

3.Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Keywords： Nickel-base single crystal superalloy

The creep rupture properties of a single crystal superalloy were tested at 975℃/255 MPa as a function of the deviation degrees from [001].The misorientation of the specimens away from [001] distributed approximately along a line between [001]-[011] and [001]-[lll] boundaries in the triangle of the stereographic projection.Creep rupture lifetimes of the specimens were not sensitive to the misorientation until the deviation degree exceeded ～30 deg.Two steps of lattice rotation were found in all specimens during creep, first towards the [001]-[111] boundary, and then to [001] or [111] along the boundary.Single slip and strong asymmetric deformation were observed during the first stage of lattice rotation in specimens with large misorientation.The rotation mechanism was associated with the activated slip systems according to the calculated Schmid factors.The impact of lattice rotation on the rupture properties was also discussed.

参考文献

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[2]	N. MATAN;D.C. COX;P. CARTER .CREEP OF CMSX-4 SUPERALLOY SINGLE CRYSTALS: EFFECTS OF MISORIENTATION AND TEMPERATURE[J].Acta materialia,1999(5):1549-1563.
[3]	V. SASS;U. GLATZEL;M. FELLER-KNIEPMEIER .ANISOTROPIC CREEP PROPERTIES OF THE NICKEL-BASE SUPERALLOY CMSX-4[J].Acta materialia,1996(5):1967-1977.
[4]	L.-M. PAN;I. SCHEIBLI;M. B. HENDERSON;B. A. SHOLLOCK;M. McLEAN .ASYMMETRIC CREEP DEFORMATION OF A SINGLE CRYSTAL SUPERALLOY[J].Acta Metallurgica et Materialia,1995(4):1375-1384.

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Anisotropic Creep Rupture Properties of a Nickel-base Single Crystal Superalloy at High Temperature

参考文献