Creep Properties and Microstructural Evolution at 760°C/785MPa of a Re-Containing Single Crystal Superalloy

2019 ◽  
Vol 944 ◽  
pp. 8-12
Author(s):  
Yun Song Zhao ◽  
Yan Fei Liu ◽  
Jing Xuan Zhao ◽  
Xiao Tie Zhang ◽  
Yan Yang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Single Crystal ◽  
Microstructural Evolution ◽  
Rupture Life ◽  
Turbine Blades ◽  
Creep Rupture ◽  
Single Crystal Superalloy ◽  
Creep Tests ◽  
Dislocation Configuration ◽  
Creep Properties

Intermediate temperature creep properties are considered a key indicator of single crystal superalloys used for turbine blades of aircraft engines. The interrupted and ruptured creep tests were carried out in a second generation single crystal superalloy under the conditions of 760°C/785MPa. The creep rupture life as well as minimum creep rate were also in the same level of those in CMSX-4 and PWA1484. The microstructural evolution at different creep stages were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed the γ’ phases kept the cuboid morphology mostly until the creep rupture, and super lattice stacking faults (SSFs) extended along [-1 1 0] and [-1-1 0] orientations within the γ’ precipitate were the typical dislocation configuration.

Effects of Surface Recrystallization on the Microstructures and Creep Properties of Single Crystal Superalloy DD6

2010 ◽  
Vol 638-642 ◽  
pp. 2279-2284
Author(s):  
Jia Rong Li ◽  
Feng Li Sun ◽  
Ji Chun Xiong ◽  
Shi Zhong Liu ◽  
Mei Han
Keyword(s):  
Single Crystal ◽  
Annealing Temperature ◽  
Low Cost ◽  
Rupture Life ◽  
Creep Rupture ◽  
Single Crystal Superalloy ◽  
Recrystallization Temperature ◽  
Creep Properties ◽  
Grit Blasting ◽  
Rupture Properties

This work assesses the effects of the surface recrystallization of the processing of water grit blasting, grit blasting and mechanically polishing on the microstructures and creep rupture properties of DD6 alloy, a low-cost second generation single crystal superalloy. The results demonstrate that the possibility and the depth of the surface recrystallization of DD6 show an increase as the annealing temperature increases from 1050°C to 1250°C. No surface recrystallization happens when the specimens of the alloy have been undergone at 1100°C for 4 hours after water grit blasting, but the surface recrystallization occurs at the annealing temperature above 1200°C for 4 hours after water grit blasting. The test indicates that the increasing pre-deformation decreases the surface recrystallization temperature. The creep rupture life of DD6 alloy without processing is 274.4 hours, 341.1 hours at the conditions of 980°C/250MPa, 1070°C/140MPa respectively. After annealing at 1100°C for 4 hours, the creep rupture life of the alloy with the processing of water grit blasting is equivalent to that of the alloy without processing. The surface recrystallization of the alloy happens with the processing of grit blasting after the annealing at 1100°C for 4 hours, and there is a reduction of the creep rupture life at the conditions as mentioned above. The creep properties of DD6 alloy meet the needs of blades and vanes of single crystal for advanced aeroengines when the surface recrystallization of the alloy occurs during manufacturing and processing.

Prediction of creep rupture life of a V-notched bar in DD6 Ni-based single crystal superalloy

2014 ◽  
Vol 615 ◽  
pp. 14-21 ◽  
Author(s):  
D.S. Liu ◽  
D.X. Zhang ◽  
J.W. Liang ◽  
Z.X. Wen ◽  
Z.F. Yue
Keyword(s):  
Single Crystal ◽  
Rupture Life ◽  
Creep Rupture ◽  
Single Crystal Superalloy

Effect of Squareness of Initial γ′ Precipitates on Creep-Rupture Life of a Ni-Base Single Crystal Superalloy at 760/982 °C

2018 ◽  
Vol 49 (7) ◽  
pp. 2929-2939
Author(s):  
Zhenbin Shi ◽  
Zhifang Peng ◽  
Yushi Luo ◽  
Hongji Xie ◽  
Haipeng Jin ◽  
...  
Keyword(s):  
Single Crystal ◽  
Rupture Life ◽  
Creep Rupture ◽  
Single Crystal Superalloy

Simulation study and experiment verification of the creep mechanism of a nickel-based single crystal superalloy obtained from microstructural evolution

RSC Advances ◽  
2016 ◽  
Vol 6 (109) ◽  
pp. 107748-107758 ◽  
Author(s):  
Jingui Yu ◽  
Shiming Zhang ◽  
Qiaoxin Zhang ◽  
Rong Liu ◽  
Mingkai Tang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Single Crystal ◽  
Microstructural Evolution ◽  
Simulation Study ◽  
Md Simulations ◽  
Creep Mechanism ◽  
Single Crystal Superalloy ◽  
Creep Properties ◽  
Experiment Verification

Molecular dynamics (MD) simulations and experiments were used to understand the creep properties and microstructural evolution of a nickel-based single crystal superalloy.

Investigation on Creep Mechanism of a Ni3Al-Based Single Crystal Superalloy IC6SX under 760°C/540MPa

2013 ◽  
Vol 747-748 ◽  
pp. 804-809 ◽  
Author(s):  
Li Wu Jiang ◽  
Shu Suo Li ◽  
Mei Ling Wu
Keyword(s):  
Electron Microscopy ◽  
Single Crystal ◽  
Creep Mechanism ◽  
Single Crystal Superalloy ◽  
Creep Process ◽  
Dislocation Configuration ◽  
Creep Stage ◽  
Dislocation Glide ◽  
Accelerated Creep ◽  
Testing Condition

The creep behaviors of a Ni3Al-base single crystal superalloy IC6SX prepared by spiral grain selection method was studied systematically under the testing condition of 760/540MPa. The microstructure evolution, movement of dislocations, formation of the dislocation networks and dislocation configuration during the creep process were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the creep performance of the single crystal alloy IC6SX is excellent under 760/540MPa. The experimental results showed that the creep curve of the Ni3Al-base single crystal superalloy IC6SX was divided into three stages, including decelerating creep stage, steady-state creep stage and accelerated creep stage. The microstructure and the dislocation configuration were different at different stage during the creep and the raft microstructure has not been formed. The creep mechanism was main slipping characterized by dislocation glide mechanism.

Effects of microstructure and lattice misfit on creep life of Ni-based single crystal superalloy during long-term thermal exposure

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wenyan Gan ◽  
Hangshan Gao ◽  
Haiqing Pei ◽  
Zhixun Wen
Keyword(s):  
Single Crystal ◽  
Rupture Life ◽  
Precipitation Amount ◽  
Lattice Misfit ◽  
Thermal Exposure ◽  
Phase Evolution ◽  
Creep Rupture ◽  
Simultaneous Increase ◽  
Creep Life ◽  
The Matrix

Abstract According to the microstructural evolution during longterm thermal exposure at 1100 °C, the creep rupture life of Ni-based single crystal superalloys at 980 °C/270 MPa was evaluated. The microstructure was characterized by means of scanning electron microscopy, X-ray diffraction and related image processing methods. The size of γ’ precipitates and the precipitation amount of topologically close-packed increased with the increase in thermal exposure time, and coarsening of the γ’ precipitates led to the simultaneous increase of the matrix channel width. The relationship between the creep rupture life and the lattice misfit of γ/γ’, the coarsening of γ’ precipitate and the precipitation of TCP phase are systematically discussed. In addition, according to the correlation between γ’ phase evolution and creep characteristics during thermal exposure, a physical model is established to predict the remaining creep life.

scholarly journals Effect of long-term thermal exposure on microstructure and creep properties of DD5 single crystal superalloy

China Foundry ◽  
2021 ◽  
Vol 18 (3) ◽  
pp. 185-191
Author(s):  
Xu-dong Wang ◽  
Zhong Yang ◽  
Qiang Gao ◽  
Li-rong Liu
Keyword(s):  
Single Crystal ◽  
Thermal Exposure ◽  
Single Crystal Superalloy ◽  
Creep Properties
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