Role of Hydrogen-Charging on Nucleation and Growth of Ductile Damage in Austenitic Stainless Steels
Abstract
:1. Introduction
2. Materials And Methods
2.1. Materials
2.2. Methods
3. Results
3.1. EBSD
3.2. Hardening Curves from In Situ X-Ray Computed Tomography
3.3. Qualitative Damage Evolution
3.4. Quantitative Damage Evolution
Void Nucleation
3.5. Void Growth
3.6. Aspect Ratio of the Cavities
4. Discussion
5. Conclusions
- The ductility is reduced by Hydrogen charging, in a more important way for the AISI316 sample.
- In this material, cavities quickly transform into cracks perpendicular to the tensile axis leading to early fracture.
- By quantifying damage, we have also shown that both nucleation and growth, are not strongly affected by hydrogen charging. This means that the microscopic evolution of damage is not accelerated by the presence of hydrogen.
- The only noticeable difference, and the explanation for the reduction in ductility, is the aspect ratio of the cavities showing again a crack shape in the hydrogen-charged AISI316 leading to earlier macroscopic fracture.
Author Contributions
Acknowledgments
Conflicts of Interest
References
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C | Si | Mn | P | S | Cr | Mo | Ni | |
---|---|---|---|---|---|---|---|---|
AISI316 | 0.04 | 0.64 | 0.93 | 0.032 | 0.001 | 16.83 | 2.05 | 10.23 |
AISI316L | 0.018 | 0.50 | 0.84 | 0.021 | 0 | 17.45 | 2.05 | 12.09 |
Materials | 0.2% Proof Stress | Tensile Strength | Elongation (%) |
---|---|---|---|
(MPa) | (MPa) | (%) | |
AISI316 | 263 | 586 | 61.0 |
AISI316L | 229 | 528 | 66.0 |
Materials | Specimen Shape | Ductility | DDH: Decrease Due to Hydrogen Charging (%) | |
---|---|---|---|---|
Non-Charged | Hydrogen-Charged | |||
AISI316 | Smooth | 1.91 | 0.885 | 53.7 |
Notched | 1.66 | 0.62 | 62.7 | |
AISI316L | Smooth | 1.92 | 1.35 | 29.4 |
Notched | 1.9 | 1.08 | 42.9 |
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Maire, E.; Grabon, S.; Adrien, J.; Lorenzino, P.; Asanuma, Y.; Takakuwa, O.; Matsunaga, H. Role of Hydrogen-Charging on Nucleation and Growth of Ductile Damage in Austenitic Stainless Steels. Materials 2019, 12, 1426. https://doi.org/10.3390/ma12091426
Maire E, Grabon S, Adrien J, Lorenzino P, Asanuma Y, Takakuwa O, Matsunaga H. Role of Hydrogen-Charging on Nucleation and Growth of Ductile Damage in Austenitic Stainless Steels. Materials. 2019; 12(9):1426. https://doi.org/10.3390/ma12091426
Chicago/Turabian StyleMaire, Eric, Stanislas Grabon, Jérôme Adrien, Pablo Lorenzino, Yuki Asanuma, Osamu Takakuwa, and Hisao Matsunaga. 2019. "Role of Hydrogen-Charging on Nucleation and Growth of Ductile Damage in Austenitic Stainless Steels" Materials 12, no. 9: 1426. https://doi.org/10.3390/ma12091426