Effect of Heat Treatment Process on the Optimization of Grain Boundary Character Distribution in Heavy Gage Austenitic Stainless Steel
Abstract
:1. Introduction
2. Experimental Procedures
3. Results and Discussion
3.1. Evolution of GBCDs with Different Heat Treatment Processes
3.2. Proliferation Mechanism of Σ3n Boundaries during Heat Treatment Process
4. Conclusions
- The temperature and holding time during heat treatment process have a significant effect on the GBCDs of hot-rolled 316H ASS for nuclear power. The solution annealing with a long time period at lower temperature or short time period at higher temperature is conducive to obtaining optimized GBCDs, including large TRDs, abundant interconnected Σ3n boundaries and an interrupted topology network of RHAGBs in the microstructure.
- The fraction of Σ3n boundaries has no inevitable proportional relationship with their character distribution. It was worked out that the character distribution of Σ3n boundaries can be further optimized by modifying the solution annealing process even though their length fraction or number does not increase significantly, which provides an important route for realizing the optimization of GBCDs in special ASSs.
- It is easier to activate the new twinning mechanism by solution annealing at low temperature for a long time, leading to the formation of Σ3 boundaries with straight morphology and larger size. In addition, both the new twinning and Σ3 regeneration mechanisms exist in the annealing process for introducing the proliferation of Σ3n boundaries, and they basically maintain the balance with the increase of annealing time at higher temperature.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Wang, Z.; Zhang, W.; Ma, A.; Li, J.; Gao, F.; Li, C.; Liu, Z. Effect of Heat Treatment Process on the Optimization of Grain Boundary Character Distribution in Heavy Gage Austenitic Stainless Steel. Crystals 2023, 13, 89. https://doi.org/10.3390/cryst13010089
Wang Z, Zhang W, Ma A, Li J, Gao F, Li C, Liu Z. Effect of Heat Treatment Process on the Optimization of Grain Boundary Character Distribution in Heavy Gage Austenitic Stainless Steel. Crystals. 2023; 13(1):89. https://doi.org/10.3390/cryst13010089
Chicago/Turabian StyleWang, Zhiguo, Weina Zhang, Aoran Ma, Jianyuan Li, Fei Gao, Chengang Li, and Zhenyu Liu. 2023. "Effect of Heat Treatment Process on the Optimization of Grain Boundary Character Distribution in Heavy Gage Austenitic Stainless Steel" Crystals 13, no. 1: 89. https://doi.org/10.3390/cryst13010089
APA StyleWang, Z., Zhang, W., Ma, A., Li, J., Gao, F., Li, C., & Liu, Z. (2023). Effect of Heat Treatment Process on the Optimization of Grain Boundary Character Distribution in Heavy Gage Austenitic Stainless Steel. Crystals, 13(1), 89. https://doi.org/10.3390/cryst13010089