Research on Microstructures and Properties of High-Strength Anticorrosion Twinning-Induced Plasticity Steels
Abstract
:1. Introduction
2. Experimental Procedures
3. Results and Discussion
3.1. Influence of Cr on the Stacking-Fault Energy (SFE) of Alloy
3.2. Influence of Cr on the Microstructures of Alloy
3.3. Influence of Cr on the Mechanical Properties of Alloys
3.4. Influence of Cr on the Corrosion Resistance of Alloy
4. Conclusions
- (1)
- The Fe–Mn–Cr–CN TWIP steels still had the stable single austenite phase before and after the tensile test, even with Cr contents as high as 12 and 18 wt.%;
- (2)
- Compared with the TWIP-ref steel, the Fe–Mn–Cr–CN TWIP steels have better mechanical properties and corrosion resistance. The strain-hardening rate of 12CrN steel is lower than that of the TWIP-ref steel because of the relatively late generation of high-density deformation twins, which resulted in less tensile strength increments during the tensile test. The yield strengths of the 12CrN and 18CrN samples are 496 and 512 MPa, respectively, which are much higher than that of the TWIP-ref sample (308 MPa). Moreover, the Fe–Mn–Cr–CN steels have more excellent anticorrosion properties. The Ecorr values of the 12CrN and 18CrN samples are −483 and −494 mV, respectively, which are more positive than that of the TWIP-ref sample (−845 mV), and the Icorr of the 12CrN sample (1.4707 × 10−6 A·cm−2) is significantly smaller than that of the TWIP-ref sample (2.9027 × 10−6 A·cm−2);
- (3)
- The higher Cr content of the 18CrN sample leads to the precipitation of M23C6, which is harmful to the ductility and corrosion resistance of Fe–Mn–Cr–CN TWIP steels. Therefore, compared to the 12CrN sample, the 18CrN sample has poor ductility and anticorrosion properties.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Notation | Mn | Cr | C | N | P | S | Si | Ni | Fe |
---|---|---|---|---|---|---|---|---|---|
TWIP-ref | 21.89 | 0.052 | 0.52 | - | 0.011 | 0.009 | 0.609 | 0.057 | Bal. |
12CrN | 26.16 | 12.38 | 0.32 | 0.31 | 0.009 | 0.001 | 0.001 | 0.081 | Bal. |
18CrN | 26.28 | 17.29 | 0.28 | 0.32 | 0.011 | 0.001 | 0.001 | 0.020 | Bal. |
Samples | σYS/MPa | σUTS/MPa | δ/% |
---|---|---|---|
TWIP-ref | 308 | 890 | 63.4 |
12CrN | 496 | 904 | 67.2 |
18CrN | 512 | 876 | 50.3 |
Samples | Ecorr/mV | Icorr/10−6 A·cm−2 |
---|---|---|
TWIP-ref | −845 | 2.9027 |
12CrN | −483 | 1.4707 |
18CrN | −494 | 2.3920 |
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Si, Y.; Wang, X.; Liang, J.; Han, F. Research on Microstructures and Properties of High-Strength Anticorrosion Twinning-Induced Plasticity Steels. Metals 2022, 12, 537. https://doi.org/10.3390/met12040537
Si Y, Wang X, Liang J, Han F. Research on Microstructures and Properties of High-Strength Anticorrosion Twinning-Induced Plasticity Steels. Metals. 2022; 12(4):537. https://doi.org/10.3390/met12040537
Chicago/Turabian StyleSi, Yongli, Xingfu Wang, Juhua Liang, and Fusheng Han. 2022. "Research on Microstructures and Properties of High-Strength Anticorrosion Twinning-Induced Plasticity Steels" Metals 12, no. 4: 537. https://doi.org/10.3390/met12040537