The effect of microstructure on the creep behavior of a low rhenium-containing single crystal nickel-based superalloy

被引：30
作者：
Sun, Nairong [1 ,2 ]
Zhang, Lanting [1 ,2 ,3 ]
Li, Zhigang [1 ,2 ]
Shan, Aidang [1 ,2 ,3 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Shanghai Key Lab High Temp Mat & Precis Forming, Shanghai 200240, Peoples R China
[3] Shanghai Jiao Tong Univ, Gas Turbine Res Inst, Shanghai 200240, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 606卷
关键词：
Nickel based superalloy; Microstructure; gamma' Precipitate; Rhenium; Creep; STRESS RUPTURE PROPERTIES; INTERFACIAL DISLOCATION NETWORKS; HEAT-TREATMENT; TMS-138; SUPERALLOY; TEMPERATURE CREEP; GAMMA'-PHASE; ALLOY; MECHANISM; DD6;
D O I：
10.1016/j.msea.2014.03.074
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A low rhenium-containing single crystal nickel-based superalloy designated DD6 with different gamma' morphologies induced by discrepant aging treatments crept at 1100 degrees C/137 MPa and 850 degrees C/660 MPa. The test results and TEM observations showed that creep mechanism varies with microstructure and test temperature. For creep at 1100 degrees C/137 MPa, the dislocation network on gamma/gamma' interface plays a key role in prolonging creep life. The sample with the lager cubical gamma' precipitate got the longest rupture life. For creep at 850 degrees C/660 MPa, the morphology of gamma' phase and the width of the gamma channels dominate the deformation behavior. The sample with smaller gamma' particles and narrower gamma channel exhibited the highest creep life due to the inhomogeneous activations of multiple < 112 > {111} slip systems. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：175 / 186
页数：12
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