Effect of Ti content on creep properties of Ni-base single crystal superalloys

被引：10
|
作者：
Choi, Baig Gyu [1 ]
Kim, In Soo [1 ]
Hong, Hyun Uk [2 ]
Do, Jeonghyeon [1 ]
Jung, Joong Eun [1 ]
Jo, Chang Yong [1 ]
机构：
[1] Korea Inst Mat Sci, High Temp Mat Dept, Chang Won 51508, South Korea
[2] Changwon Natl Univ, Dept Mat Sci & Engn, Chang Won 51140, South Korea
来源：
METALS AND MATERIALS INTERNATIONAL | 2017年 / 23卷 / 05期
关键词：
alloys; Ni-based superalloy; casting; creep; transmission electron microscopy (TEM); STACKING-FAULT ENERGY; TEMPERATURE-DEPENDENCE; MECHANISMS; GAMMA; INTERMEDIATE; RUTHENIUM; NI3AL; SHEAR;
D O I：
10.1007/s12540-017-7089-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of Ti content on the creep properties and microstructures of experimental Ni-base single crystal superalloys has been investigated. The experimental alloys were designed to provide better high temperature properties than the commercial single crystal alloy CMSX-4. The creep properties of the experimental alloys, Alloy 2 and Alloy 3, were superior to those of CMSX-4. Alloy 3 showed a longer creep life than Alloy 2 at 900 A degrees C and 950 A degrees C, while it has similar creep life with Alloy 2 at 982 A degrees C. Transmission electron microscopy micrographs of the experimental alloys after the creep test showed distinct deformation features as a function of temperature and Ti content. The dissociation of dislocations into partial dislocations with stacking faults in Alloy 3 was found to improve resistance to creep deformation at 950 A degrees C. The effect of Ti on the creep deformation mechanism was not evident at 982 A degrees C, which resulted in similar creep properties in both experimental alloys. The transition of the gamma' cutting mechanism from dislocations coupled with stacking faults to anti-phase boundary coupled pairs occurred both in Alloy 2 and Alloy 3. However, the transition temperature was higher in Alloy 3 than in Alloy 2 because of the difference in Ti contents.
引用
收藏
页码：877 / 883
页数：7
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