Characterization of the Microstructure, Mechanical Properties, and Corrosion Resistance of a Friction-Stir-Welded Joint of Hyper Duplex Stainless Steel
Abstract
:1. Introduction
2. Materials & Experiment
3. Results and Discussion
3.1. Microstructural Evolution
3.2. Mechanical Characterization
3.3. Corrosion Resistance
4. Conclusions
- (1)
- A high-quality FSW joint without deleterious phases is obtained by rapidly cooling the samples. The welded joint microstructure contains fine equiaxed grains in the SZ. The grains are exceptionally pronounced in the austenite phase.
- (2)
- Failure of the tensile specimens is consistently located in the BM zone, suggesting that the welded joint overly matches the BM. Owing to their fine grains, the welded joints display a higher tensile strength than their BMs.
- (3)
- In the potentiodynamic polarization and impedance spectroscopy tests in NaCl solution, all SZs exhibit corrosion resistance superior to that of the BM.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Elements | C | N | Si | Mn | Cr | Ni | Co | Mo | Cu | Ce | Fe |
---|---|---|---|---|---|---|---|---|---|---|---|
Content (wt. %) | 0.02 | 0.47 | 0.42 | 1.00 | 27.07 | 6.71 | 0.99 | 4.66 | 0.85 | 0.03 | Bal. |
Area | Rs (Ω∙cm2) | Q1 (uF∙cm−2) | R1 (kΩ∙cm2) | n1 | R2 (kΩ∙cm2) | Q2 (uF∙cm−2) | n2 |
---|---|---|---|---|---|---|---|
BM | 30.53 | 19.10 | 0.51 | 0.98 | 262.50 | 16.50 | 0.77 |
SZ | 27.61 | 29.25 | 47.35 | 0.94 | 304.50 | 12.94 | 0.84 |
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Li, J.; Liu, X.; Li, G.; Han, P.; Liang, W. Characterization of the Microstructure, Mechanical Properties, and Corrosion Resistance of a Friction-Stir-Welded Joint of Hyper Duplex Stainless Steel. Metals 2017, 7, 138. https://doi.org/10.3390/met7040138
Li J, Liu X, Li G, Han P, Liang W. Characterization of the Microstructure, Mechanical Properties, and Corrosion Resistance of a Friction-Stir-Welded Joint of Hyper Duplex Stainless Steel. Metals. 2017; 7(4):138. https://doi.org/10.3390/met7040138
Chicago/Turabian StyleLi, Jianchun, Xinglong Liu, Guoping Li, Peide Han, and Wei Liang. 2017. "Characterization of the Microstructure, Mechanical Properties, and Corrosion Resistance of a Friction-Stir-Welded Joint of Hyper Duplex Stainless Steel" Metals 7, no. 4: 138. https://doi.org/10.3390/met7040138