scholarly journals Effect of Stress on Creep Behavior of Single Crystal Alloy IC6SX at 980°C

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Liwu Jiang ◽  
Xuezheng Dou ◽  
Meiling Wu
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Steady State Creep Rate ◽  
Creep Life ◽  
Creep Experiment ◽  
Dislocation Glide ◽  
Single Crystal Alloy ◽  
Higher Temperature ◽  
And Diffusion ◽  
Mixed Mechanism

Ni3Al-based single crystal alloy IC6SX was prepared by seed crystal method. The effect of different stress conditions on creep behavior of this alloy at 980°C was investigated. The results showed that the creep life of this alloy at 980°C decreased significantly with the increase of stress. When the stress increased from 180 MPa to 230 MPa, the creep life dropped from 245.5 h to 69.3 h, and the steady-state creep rate increased slightly but not significantly. Meanwhile, the morphology of γ ′ phase and dislocation after creep were studied. The results showed that with the increase of stress, the density of dislocations in the γ ′ phase increased gradually, the strength of this alloy decreased gradually, so the creep life decreased significantly. The Y-NiMo phase resolved from the γ phase decreased gradually as the creep life decreased. The creep experiment of the alloy was carried out at 980°C. Due to the higher temperature, the diffusion of atoms in this alloy became faster. Deformation was not only caused by the slippage of dislocations in the crystal but also by the diffusion of atoms. Therefore, the creep mechanism of single crystal alloy IC6SX at this temperature is a mixed mechanism of dislocation glide and diffusion.

scholarly journals Study on the Creep Behavior of a Ni3Al-Based Single Crystal Alloy at 850°C/450 MPa

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Liwu Jiang ◽  
Yu Yang ◽  
Meiling Wu ◽  
Min Cai
Keyword(s):  
Fracture Surface ◽  
Single Crystal ◽  
Creep Behavior ◽  
Creep Deformation ◽  
Fracture Mechanism ◽  
Crystal Orientation ◽  
Fracture Morphology ◽  
Cutting Mechanism ◽  
Single Crystal Alloy ◽  
Fracture Morphologies

The creep behaviors of Ni3Al-based single crystal alloy IC6SX with [001] and [111] orientations under the condition of 850°C/450 MPa were investigated. The effect of crystal orientation on the creep lives, fracture morphology, fracture mechanism, and dislocation evolution of the alloys with different orientations was analyzed systematically. The results showed that the creep lives of the alloy were closely related to the crystal orientation under the condition of 850°C/450 MPa. The creep lives of the single crystal alloys with [001] and [111] orientations were 56.3 h and 126.9 h, respectively. Moreover, the fracture morphologies of the two alloys with [001] and [111] orientations were different. The results showed that some holes formed at the fracture surface of the alloy with [111] rather than [001] orientation. Furthermore, the surface near the fracture of the two alloys with [001] and [111] orientations was serrated. Therefore, the fracture mechanism of the single crystal alloys with [001] and [111] orientations was ductile fracture. In addition, a large number of dislocations cut into the γ ′ phase. Therefore, the cutting mechanism of dislocations in the alloys with [001] and [111] orientations was the creep deformation mechanism.

scholarly journals Influences of Holes Arrangement on Creep Characteristic of Nickel-Base Single Crystal Alloy Blade Cooling Holes

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Lei Li ◽  
Liangbo Ao ◽  
Gongnan Xie ◽  
Xinmei Wang ◽  
Gang Cao
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Film Cooling ◽  
Horizontal Distance ◽  
Blade Cooling ◽  
Single Crystal Alloy ◽  
Creep Time ◽  
Creep Characteristic ◽  
Cooling Technology ◽  
Nickel Base

Film cooling technology is developed to enhance the temperature resistant of nickel-base single crystal alloy blade. The shape, dimension, and arrangement of cooling holes impact the blade strength and life grievously. In this paper, the influences of holes arrangement on creep characteristic of cooling holes in the plate sample are investigated. The constitutive model for creep considering both cavitation and degradation damage is developed to predict the creep behavior of cooling holes. Results show that there are stress interferences among cooling holes. The distance and radius of the cooling holes impact the creep behavior of cooling holes seriously. Decreasing horizontal distance of the holes results in creep time reducing. On the contrary, increasing the vertical distance of the holes makes the creep time reduced.

scholarly journals Creep behavior of a novel Co-Al-W-base single crystal alloy containing Ta and Ti at 982∘C

2014 ◽  
Vol 14 ◽  
pp. 15002 ◽  
Author(s):  
Fei Xue ◽  
Haijing Zhou ◽  
Xuhua Chen ◽  
Qianying Shi ◽  
Hai Chang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Single Crystal Alloy

Creep Behavior of SiC-Reinforced XDTM MoSi2 Composite

1992 ◽  
Vol 273 ◽  
Author(s):  
M. Suzuki ◽  
S. R. Nutt ◽  
M. Aikin
Keyword(s):  
Activation Energy ◽  
Creep Behavior ◽  
Base Alloy ◽  
Creep Damage ◽  
Threshold Temperature ◽  
Atmospheric Effect ◽  
Dislocation Glide ◽  
Higher Temperature ◽  
Mosi2 Composite

ABSTRACTThe compressive creep behavior of MoSi2 reinforced with 30v/o SiC fabricated by in situ XDTM process was investigated at 1050°C–1300°C in anaerobic and aerobic test ambients. Creep experiments performed with the composite in dry nitrogen and in air showed power-law type constitutive behavior and a stress exponent of ∼3.5. Creep deformation occurred by dislocation glide accompanied by cavitation, and the apparent activation energy for creep at 1100°C–1300°C was bi-vaiued with a threshold temperature of ∼1170°C. Microstrucural observations by TEM indicated that the rate-controlling process changed from dislocation glide to dislocation climb at higher temperature, corresponding to the change in activation energy. Creep damage occurred by cavitation at SiC-matrix interfaces and at grain boundaries within polycrystalline SiC particles. This process was apparently facilitated by the accumulation of glassy phase at these sites during creep. Creep experiments in air showed there was no appreciable atmospheric effect on the response of the composite, while an increased strain rate was observed in the base alloy due to an increase in glass phase resulting from thermal oxidation.

Creep behavior in a γ′ strengthened Co–Al–W–Ta–Ti single-crystal alloy at 1000 °C

2015 ◽  
Vol 97 ◽  
pp. 37-40 ◽  
Author(s):  
F. Xue ◽  
H.J. Zhou ◽  
Q.Y. Shi ◽  
X.H. Chen ◽  
H. Chang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Single Crystal Alloy

CMSX-2

Alloy Digest ◽  
1992 ◽  
Vol 41 (11) ◽  
Keyword(s):  
Physical Properties ◽  
Single Crystal ◽  
Alloy Development ◽  
Single Crystal Alloy ◽  
High Level

Abstract CMSX-2 is a single crystal alloy development of Cannon-Muskegon Corporation designed to achieve a high level of balanced properties. This datasheet provides information on composition, physical properties, as well ascreep and fatigue. Filing Code: Ni-417. Producer or source: Cannon-Muskegon Corporation.

scholarly journals Creep Damage Repair of a Nickel-Based Single Crystal Superalloy Based on Heat Treatment

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 623
Author(s):  
Xiaoyan Wang ◽  
Meng Li ◽  
Yuansheng Wang ◽  
Chengjiang Zhang ◽  
Zhixun Wen
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Creep Damage ◽  
Primary Creep ◽  
Single Crystal Superalloy ◽  
Secondary Creep ◽  
Creep Life ◽  
Phase Coarsening ◽  
Damage Repair ◽  
Creep Time

Taking nickel-based single crystal superalloy DD6 as the research object, different degrees of creep damage were prefabricated by creep interruption tests, and then the creep damage was repaired by the restoration heat treatment system of solid solution heat treatment and two-stage aging heat treatment. The results show that with the creep time increasing, the alloy underwent microstructure evolution including γ′ phase coarsening, N-type rafting and de-rafting. After the restoration heat treatment, the coarse rafted γ′ phase of creep damaged specimens dissolved, precipitated, grew up, and became cubic again. Except for the specimens with creep interruption of 100 h, the γ′ phase can basically achieve the same arrangement as the γ′ phase of the original sample. The comparison of the secondary creep test shows that the steady-state creep stage of the test piece after the restoration heat treatment is relatively increased, and the total creep life can reach the same level as the primary creep life. The high temperature creep properties of the tested alloy are basically recovered, and the restoration heat treatment effect is good.

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