Competitive grain growth mechanism in three dimensions during directional solidification of a nickel-based superalloy

2013 ◽  
Vol 578 ◽  
pp. 577-584 ◽  
Author(s):  
Chubin Yang ◽  
Lin Liu ◽  
Xinbao Zhao ◽  
Ning Wang ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Directional Solidification ◽  
Grain Growth ◽  
Growth Mechanism ◽  
Three Dimensions ◽  
Nickel Based Superalloy

Statistical Consideration of Grain Growth Mechanism of Multicrystalline Si by One-Directional Solidification Technique

2015 ◽  
Vol 242 ◽  
pp. 35-40
Author(s):  
Takashi Sekiguchi ◽  
Ronit R. Prakash ◽  
Karolin Jiptner ◽  
Xian Jia Luo ◽  
Jun Chen ◽  
...  
Keyword(s):  
Steady State ◽  
Grain Boundary ◽  
Directional Solidification ◽  
Grain Growth ◽  
Growth Mechanism ◽  
Grain Shape ◽  
The Other ◽  
Shape Evolution ◽  
Initial Stage ◽  
Statistical Consideration

The grain evolution of multicrystalline Si was studied using the ingot grown from microcrystalline template. The grain shape evolution and width increase are not monotonic but may have 3 stages. On the other hand, the grain boundary (GB) analysis suggests that there exit 2 reactions, namely random GB annihilation at the initial stage and Σ3 generation and annihilation at the steady state.

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.

High Temperature Rupture Life of Nickel-Based Superalloy under Directional Solidification with High Temperature Gradient

2017 ◽  
Vol 898 ◽  
pp. 422-429 ◽  
Author(s):  
Wei Guo Zhang ◽  
Zhi Jie Liu ◽  
Song Ke Feng ◽  
Fu Zeng Yang ◽  
Lin Liu
Keyword(s):  
High Temperature ◽  
Temperature Gradient ◽  
Directional Solidification ◽  
Temperature Stress ◽  
Solidification Rate ◽  
Rupture Life ◽  
Stress Rupture ◽  
High Temperature Stress ◽  
Stress Rupture Life ◽  
Nickel Based Superalloy

The stress rupture life of DZ125 nickel-based superalloy that was prepared by directional solidification process under the temperature gradient of 500 K/cm has been studied at 900°C and 235MPa. The results showed that with the increase of directional solidification rate from 50 μm/s to 800 μm/s, the primary dendrite arm spacing reduced from 94 μm to 35.8 μm and γ' precipitates reduced and more uniformed in size. The high temperature stress rupture life of as-cast sample increased firstly and then decreased and reached its maximum at the solidification rate of 500 μm/s. The dislocation configuration of sample with refine dendritic structure after stress rupture was investigated and discovered that the dislocations in different parts of sample had different morphology and density, which indicated that the deformation of as-cast samples were uneven during high temperature stress rupture. A lot of dislocations intertwined around carbides and at the interface of γ/γ', and the dislocation networks were destroyed and the dislocations entered γ' precipitate by the way of cutting.

Growth Mechanism During Directional Solidification on Y-System Superconductors

1992 ◽  
pp. 429-432 ◽  
Author(s):  
Teruo Izumi ◽  
Yuichi Nakamura ◽  
Tae Hyun Sung ◽  
Yuh Shiohara
Keyword(s):  
Directional Solidification ◽  
Growth Mechanism

scholarly journals Ice-wedge Ice, Mackenzie Delta-Tuktoyaktuk Peninsula Area, N.W.T., Canada

1978 ◽  
Vol 20 (84) ◽  
pp. 555-562 ◽  
Author(s):  
W. Alan Gell
Keyword(s):  
Stress Field ◽  
Grain Growth ◽  
Growth Mechanism ◽  
Crystal Size ◽  
Horizontal Stress ◽  
Crystal Shape ◽  
Mackenzie Delta ◽  
Ice Wedge

Abstract Petrologic analysis was performed on ice-wedge ice in order to investigate changes in fabric across wedges in relation to the growth mechanism. Crystal size increased from the centre outward and strongly preferred dimensional orientations developed parallel to the sides of wedges. c-axis orientations changed from a horizontal girdle at the wedge centre to a point maximum normal to the foliation at the boundary. These changes are related to recrystallization and grain growth associated with the horizontal stress field. In massive ice penetrated by an ice wedge, crystal size and complexity of crystal shape decreased toward the wedge, dimensional orientations tended to become parallel to the wedge, and c-axes formed a point maximum normal to the wedge boundary.

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