scholarly journals Evaluation of Crack Initiation and Propagation Lives from Internal Defects and Lower Limit of Failure Life in High Temperature Fatigue on Ni-Based Single Crystal Superalloy.

2001 ◽  
Vol 50 (5) ◽  
pp. 510-515 ◽  
Author(s):  
Masato YAMAMOTO ◽  
Akito NITTA ◽  
Takashi OGATA
Keyword(s):  
High Temperature ◽  
Crack Initiation ◽  
Single Crystal ◽  
Lower Limit ◽  
Single Crystal Superalloy ◽  
Crack Initiation And Propagation ◽  
Internal Defects ◽  
High Temperature Fatigue ◽  
Initiation And Propagation ◽  
Failure Life

Creep Behavior of a 4.5% Re Nickel-Base Single Crystal Superalloy at High Temperature

2015 ◽  
Vol 750 ◽  
pp. 139-144 ◽  
Author(s):  
De Long Shu ◽  
Su Gui Tian ◽  
Xin Ding ◽  
Jing Wu ◽  
Qiu Yang Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Single Crystal ◽  
Deformation Mechanism ◽  
Creep Property ◽  
Single Crystal Superalloy ◽  
Micro Cracks ◽  
Initiation And Propagation ◽  
Temperature Ranges ◽  
Nickel Base

By means of heat treatment and creep property measurement, an investigation has made into the creep behaviors of a containing 4.5% Re nickel-base single crystal superalloy at high temperature. Results show that the elements W, Mo and Re are enriched in the dendrite arm regions, the elements Al, Ta, Cr and Co are enriched in the inter-dendrite region, and the segregation extent of the elements may be obviously reduced by means of heat treatment at high temperature. In the temperature ranges of 1070--1100 °C, the 4.5% Re single crystal nickel-based superallloy displays a better creep resistance and longer creep life. The deformation mechanism of the alloy during steady state creep is dislocations slipping in the γ matrix and climbing over the rafted γ′ phase. In the later stage of creep, the deformation mechanism of alloy is dislocations slipping in the γ matrix, and shearing into the rafted γ′ phase, which may promote the initiation and propagation of the micro-cracks at the interfaces of γ/γ′ phases up to the occurrence of creep fracture.

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