Creep of Single Crystals of Nickel-Based Superalloys at Ultra-High Homologous Temperature

被引:26
作者
Epishin, Alexander [1 ]
Fedelich, Bernard [2 ]
Nolze, Gert [2 ]
Schriever, Sina [2 ]
Feldmann, Titus [2 ]
Ijaz, Muhammad Farzik [3 ]
Viguier, Bernard [3 ]
Poquillon, Dominique [3 ]
Le Bouar, Yann [4 ]
Ruffini, Antoine [4 ]
Finel, Alphonse [4 ]
机构
[1] Tech Univ Berlin, Berlin, Germany
[2] BAM Fed Inst Mat Res & Testing, Berlin, Germany
[3] Univ Toulouse, CIRIMAT, Toulouse, France
[4] Off Natl Etud & Rech Aerosp, CNRS, LEM, Chatillon, France
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2018年 / 49A卷 / 09期
关键词
ORIENTATION DEPENDENCE; PLASTICITY; DEFORMATION; MECHANISMS; CMSX-4; MODEL;
D O I
10.1007/s11661-018-4729-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The creep behavior of single crystals of the nickel-based superalloy CMSX-4 was investigated at 1288 degrees C, which is the temperature of the hot isostatic pressing treatment applied to this superalloy in the industry. It was found that at this super-solvus temperature, where no gamma'-strengthening occurs, the superalloy is very soft and rapidly deforms under stresses between 4 and 16 MPa. The creep resistance was found to be very anisotropic, e.g., the creep rate of [001] crystals was about 11 times higher than that of a [111] crystal. The specimens of different orientations also showed a very different necking behavior. The reduction of the cross-sectional area psi of [001] crystals reached nearly 100 pct, while for a [111] crystal psi = 62 pct. The EBSD analysis of deformed specimens showed that despite such a large local strain the [001] crystals did not recrystallize, while a less deformed [111] crystal totally recrystallized within the necking zone. The recrystallization degree was found to be correlated with deformation behavior as well as with dwell time at high temperature. From the analysis of the obtained results (creep anisotropy, stress dependence of the creep rate, traces of shear deformation, and TEM observations), it was concluded that the main strain contribution resulted from < 01 (1) over bar >{111} octahedral slip.
引用
收藏
页码:3973 / 3987
页数:15
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