The Influence of Thermal Exposure on the Microstructure Evolution of a Nickel-Base Single Crystal Superalloy

2011 ◽  
Vol 418-420 ◽  
pp. 265-269
Author(s):  
Yu Xian Jia ◽  
Tao Jin ◽  
Jin Lai Liu
Keyword(s):  
Single Crystal ◽  
Exposure Time ◽  
Microstructure Evolution ◽  
Thermal Exposure ◽  
Single Crystal Superalloy ◽  
Matrix Channel ◽  
Oriented Samples ◽  
Tcp Phase ◽  
Nickel Base ◽  
Sem Studies

Microstructure evolution of a nickel-base single crystal superalloy on the [001], [011] and [111] orientation during thermal exposure at 1000°C was investigated. The SEM studies revealed that the size of γ' phase increased and some of which linked together with the elongation of the exposure time. After 1100h the cubic γ' phase hardly is observed, and the rafting structure becomes perfect. With growing and linking of γ' phase the γ matrix channel is widening gradually, and the direction of γ' rafts is not along one define orientation. The TCP phase is not found in the three oriented samples during the thermal exposure.

The Microstructure Evolution of a Nickel-Base Single Crystal Superalloy after Long-Term Aging

2015 ◽  
Vol 1088 ◽  
pp. 217-220 ◽  
Author(s):  
Yu Xian Jia
Keyword(s):  
Single Crystal ◽  
Exposure Time ◽  
Microstructure Evolution ◽  
Ageing Time ◽  
Thermal Exposure ◽  
Single Crystal Superalloy ◽  
Phase Precipitation ◽  
Tcp Phase ◽  
Nickel Base

Microstructure evolution of a nickel-base single crystal superalloy during thermal exposure at 982°C was investigated. The SEM studies revealed that the size of γ' phase increased and some of which linked together with the elongation of the exposure time. There is acicular phase precipitation after the long-term ageing treatment. The TCP phase is not increased by the increment of ageing time after reaching a certain amount. There are skeleton shape carbides precipitate after 100h and 300h. The amount of precipitated carbides decreases by the elongation of ageing time.

Microstructure Evolution of a Single Crystal Superalloy after Tensile Fracture at Different Temperature

2013 ◽  
Vol 721 ◽  
pp. 262-265
Author(s):  
Zhen Xue Shi ◽  
Shi Zhong Liu ◽  
J. Yu ◽  
M. Han ◽  
J.R. Li
Keyword(s):  
Single Crystal ◽  
Microstructure Evolution ◽  
Stacking Faults ◽  
Single Crystal Superalloy ◽  
Tensile Fracture ◽  
Matrix Channel ◽  
Stress Orientation ◽  
Transmission Electron ◽  
Strength Behavior ◽  
The Matrix

The tensile property tests of DD6 single crystal superalloy were performed at 25°C, 760°C and 980°C in air. Detailed microstructure evolution was carried out on the alloy to illuminate the γ phase and dislocation structure after tensile fracture by scanning electron microscope and transmission electron microscopy. The results show that the alloy has the maximum tensile strength and the minimum plasticity at 760°C. DD6 alloy has the same anomalous yield strength behavior with other single crystal superalloys. The γ phase hasve a little extension in the stress orientation after tensile fracture at 25°C. The γ phase morphology still maintains cubic after tensile fracture at 760°C. The γ phase is no longer cubic and changes into rectangular solid in the specimen tensile ruptured at 980°C. The vertical γ matrix becomes thinner and horizontal γ matrix becomes thicker slightly. The γ phase is no longer cubic and changes into rectangular solid. High density dislocations are present in the matrix channels and a lot of superlattice stacking faults are seen within γ phases in the sample tested at 25°C. A large quantities of superlattice stacking faults within γ phase and a lot of dislocations tangling in matrix channel are all present in the sample tested at 760°C. The dislocation networks have homogeneously formed at γ/γ interface in the sample tested at 980°C.

Numerical simulation of γ/γ′ microstructural evolutions induced by TCP-phase in the MC2 nickel base single crystal superalloy

2011 ◽  
Vol 528 (6) ◽  
pp. 2620-2634 ◽  
Author(s):  
J.-B. le Graverend ◽  
J. Cormier ◽  
P. Caron ◽  
S. Kruch ◽  
F. Gallerneau ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Single Crystal ◽  
Single Crystal Superalloy ◽  
Tcp Phase ◽  
Nickel Base

Microstructure evolution of a pre-compression nickel-base single crystal superalloy during tensile creep

2009 ◽  
Vol 506 (1-2) ◽  
pp. 80-86 ◽  
Author(s):  
Yu Xingfu ◽  
Tian Sugui ◽  
Du Hongqiang ◽  
Yu Huichen ◽  
Wang Minggang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Microstructure Evolution ◽  
Single Crystal Superalloy ◽  
Tensile Creep ◽  
Nickel Base

Microstructural Stability of a Single Crystal Superalloy DD10 under Stressed and Un-Stressed Thermal Exposure at 980 °C

2013 ◽  
Vol 721 ◽  
pp. 3-7 ◽  
Author(s):  
Jing Yang Chen ◽  
Li Jun Liu ◽  
Xiang Hui Li ◽  
Ming Xue ◽  
La Mei Cao
Keyword(s):  
Tensile Stress ◽  
Single Crystal ◽  
Lattice Misfit ◽  
Thermal Exposure ◽  
Single Crystal Superalloy ◽  
Microstructural Stability ◽  
Misfit Stress ◽  
Topologically Close Packed ◽  
Tcp Phase ◽  
Applied Tensile Stress

The effects of applied tensile stress on the microstructural stability of a third generation single crystal superalloy DD10 have been investigated under stressed and un-stressed thermal exposure at 980 °C. The results indicated that μ phase precipitated in the dendrite core after both stressed and un-stressed thermal exposure at 980 °C for 450 h. The μ phase formation, γ′ coarsening and rafting processes were promoted by the applied tensile stress. However, the precipitation of μ phase was not sensitive to the magnitude of applied tensile stress. Meanwhile, the applied tensile stress did not affect the type and morphology of the topologically close packed (TCP) phase. It is suggested that the interaction of the applied tensile stress and the misfit stress decreased the lattice misfit between μ phase and γ matrix and promoted the formation of μ phase.

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