Strain Amount Dependent Grain Size and Orientation Developments during Hot Compression of a Polycrystalline Nickel Based Superalloy
Abstract
:1. Introduction
2. Materials and Experimental Procedures
3. Results and Discussion
3.1. Pristine Microstructure
3.2. Deformation Modeling and Strain Distribution
3.3. Microstructure Developments Related to Strain Amount
3.4. Grain Boundaries Evolutions Related to Strain Amount
4. Conclusions
- Continuous variations of effective strain ranging from 0.23 to 1.65 across the whole sample were achieved after reaching a reduction of 70%. Gradients of microstructure and grain size were found to exist from the edge to the center of the specimen.
- Grain size was measured to be decreased with increase of effective strain form the edge to the center of specimen. The average grain size decreased dramatically at the initial deformation period and kept at a stable value by balancing the process of DRX and grain growth. The area fraction of fine grains was observed to increase all the way to the end of deformation due to successive DRX process.
- The grain boundaries are the first sites to produce misorientation, which is manifested as the formation of dislocation. Subgrains are proved to be further generated in the higher deformation regions near the grain boundaries, where new DRX grains are inclined to be generated.
Acknowledgments
Author Contributions
Conflicts of Interest
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Element | Co | Cr | Ti | W | Mo | Al | Nb | Hf | C | B | Zr | Ni |
---|---|---|---|---|---|---|---|---|---|---|---|---|
wt. % | 26 | 13 | 3.7 | 4 | 4 | 3.2 | 0.95 | 0.2 | 0.05 | 0.025 | 0.05 | Bal. |
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He, G.; Tan, L.; Liu, F.; Huang, L.; Huang, Z.; Jiang, L. Strain Amount Dependent Grain Size and Orientation Developments during Hot Compression of a Polycrystalline Nickel Based Superalloy. Materials 2017, 10, 161. https://doi.org/10.3390/ma10020161
He G, Tan L, Liu F, Huang L, Huang Z, Jiang L. Strain Amount Dependent Grain Size and Orientation Developments during Hot Compression of a Polycrystalline Nickel Based Superalloy. Materials. 2017; 10(2):161. https://doi.org/10.3390/ma10020161
Chicago/Turabian StyleHe, Guoai, Liming Tan, Feng Liu, Lan Huang, Zaiwang Huang, and Liang Jiang. 2017. "Strain Amount Dependent Grain Size and Orientation Developments during Hot Compression of a Polycrystalline Nickel Based Superalloy" Materials 10, no. 2: 161. https://doi.org/10.3390/ma10020161
APA StyleHe, G., Tan, L., Liu, F., Huang, L., Huang, Z., & Jiang, L. (2017). Strain Amount Dependent Grain Size and Orientation Developments during Hot Compression of a Polycrystalline Nickel Based Superalloy. Materials, 10(2), 161. https://doi.org/10.3390/ma10020161