scholarly journals Evolution of the Annealing Twin Density during δ-Supersolvus Grain Growth in the Nickel-Based Superalloy Inconel™ 718

Metals ◽  
2015 ◽  
Vol 6 (1) ◽  
pp. 5 ◽  
Author(s):  
Yuan Jin ◽  
Marc Bernacki ◽  
Andrea Agnoli ◽  
Brian Lin ◽  
Gregory Rohrer ◽  
...  
Keyword(s):  
Grain Growth ◽  
Annealing Twin ◽  
Twin Density ◽  
Nickel Based Superalloy

scholarly journals Formation of Annealing Twins during Recrystallization and Grain Growth in 304L Austenitic Stainless Steel

2013 ◽  
Vol 753 ◽  
pp. 113-116 ◽  
Author(s):  
Yuan Jin ◽  
M. Bernacki ◽  
G.S. Rohrer ◽  
Anthony D. Rollett ◽  
B. Lin ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Grain Boundary ◽  
Grain Growth ◽  
Boundary Migration ◽  
Annealing Twin ◽  
Strain Level ◽  
Grain Boundary Engineering ◽  
Twin Density ◽  
Annealing Twins

Understanding of the mechanisms of annealing twin formation is fundamental for grain boundary engineering. In this work, the formation of annealing twins in a 304L austenitic stainless steel is examined in relation to the thermo-mechanical history. The behaviour of annealing twins of various morphologies is analysed using an in-situ annealing device and EBSD. The results confirm that there is a synergistic effect of prior strain level on annealing twin density generated during recrystallization. The higher the prior strain level, the higher the velocity of grain boundary migration and the higher the annealing twin density in the recrystallized grains. This effect decreases as the recrystallization fraction increases. The existing mathematical models (Pande's model and Gleiter's model), which were established to predict annealing twin density in the grain growth regime, can not predict this phenomenon.

scholarly journals Multi-scale simulation of grain growth during laser beam welding of nickel-based superalloy

2020 ◽  
Vol 9 (6) ◽  
pp. 15034-15044
Author(s):  
Lei Wang ◽  
Yong Huang ◽  
Dongqing Yang ◽  
He Li ◽  
Yong Peng ◽  
...  
Keyword(s):  
Laser Beam ◽  
Grain Growth ◽  
Laser Beam Welding ◽  
Multi Scale ◽  
Nickel Based Superalloy

scholarly journals GPU-Accelerated Cellular Automaton Model for Grain Growth during Directional Solidification of Nickel-Based Superalloy

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 298
Author(s):  
Yongjia Zhang ◽  
Jianxin Zhou ◽  
Yajun Yin ◽  
Xu Shen ◽  
Taher A. Shehabeldeen ◽  
...  
Keyword(s):  
Cellular Automaton ◽  
Directional Solidification ◽  
Grain Growth ◽  
Large Scale ◽  
Solidification Process ◽  
Computing Platform ◽  
Nickel Based Superalloy ◽  
Parallel Performance ◽  
Ca Model ◽  
Columnar To Equiaxed Transition

To accelerate the large-scale cellular automaton (CA) simulation for grain growth, a parallel CA model for grain growth was developed. The model was implemented based on the compute unified device architecture (CUDA) parallel computing platform. The model was verified by the grain growth of a single crystal and the columnar-to-equiaxed transition (CET) of an Al-7wt% Si specimen of uniform undercooling with a constant cooling rate. The grid independence of the model was verified. The grain growth of a plate-like casting of nickel-based superalloy during directional solidification process was simulated and the obtained results of grain density at each section with different heights were compared with the experimental data. The CET transition of directional solidified Al-7wt% Si cylindrical ingot was simulated. The grain texture and cooling curves were in good agreement with experimental results from the literature. Finally, high parallel performance of the CA model was obtained and evaluated.

scholarly journals Annealing twin development during recrystallization and grain growth in pure nickel

2014 ◽  
Vol 597 ◽  
pp. 295-303 ◽  
Author(s):  
Y. Jin ◽  
B. Lin ◽  
M. Bernacki ◽  
G.S. Rohrer ◽  
A.D. Rollett ◽  
...  
Keyword(s):  
Grain Growth ◽  
Pure Nickel ◽  
Annealing Twin

scholarly journals Evolution of Annealing Twins in a Hot Deformed Nickel-Based Superalloy

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 7
Author(s):  
Xia-Yu Chi ◽  
Xiao-Min Chen ◽  
Yong-Cheng Lin ◽  
Xian-Zheng Lu
Keyword(s):  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Temperature ◽  
Annealing Twin ◽  
Electron Backscattered Diffraction ◽  
Flow Curves ◽  
Twin Boundaries ◽  
Deformation Degree ◽  
Nickel Based Superalloy ◽  
Annealing Twins

The hot deformation characteristics of a GH4169 superalloy are investigated at the temperature and strain rate ranges of 1193–1313 K and 0.01–1 s−1, respectively, through Gleeble-3500 simulator. The hot deformed microstructures are analyzed by optical microscopy (OM), transmission electron microscopy (TEM), and electron backscattered diffraction (EBSD) technology. The effects of deformation parameters on the features of flow curves and annealing twins are discussed in detail. It is found that the shapes of flow curves are greatly affected by the deformation temperature. Broad peaks appear at low deformation temperatures or high strain rates. In addition, the evolution of annealing twins is significantly sensitive to the deformation degree, temperature, and strain rate. The fraction of annealing twins first decreases and then rises with the added deformation degree. This is because the initial annealing twin characters disappear at the relatively small strains, while the annealing twins rapidly generate with the growth of dynamic recrystallized grains during the subsequent hot deformation. The fraction of annealing twins is relatively high when the deformation temperature is high or the strain rate is low. In addition, the important role of annealing twins on dynamic recrystallization (DRX) behaviors are elucidated. The obvious bulging at initial twin boundaries, and the coherency of annealing twin boundaries with dynamic recrystallized grain boundaries, indicates that annealing twins can motivate the DRX nucleation during the hot deformation.

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