J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (10): 1781-1790.DOI: 10.1016/j.jmst.2018.03.021
• Orginal Article • Previous Articles Next Articles
Hao Fenga, Huabing Lia(), Xiaolei Wub(), Zhouhua Jianga, Si Zhaoa, Tao Zhangc, Dake Xuc, Shucai Zhanga, Hongchun Zhua, Binbin Zhanga, Muxin Yangb
Received:
2017-12-28
Revised:
2018-01-31
Accepted:
2018-03-06
Online:
2018-10-05
Published:
2018-11-01
Hao Feng, Huabing Li, Xiaolei Wu, Zhouhua Jiang, Si Zhao, Tao Zhang, Dake Xu, Shucai Zhang, Hongchun Zhu, Binbin Zhang, Muxin Yang. Effect of nitrogen on corrosion behaviour of a novel high nitrogen medium-entropy alloy CrCoNiN manufactured by pressurized metallurgy[J]. J. Mater. Sci. Technol., 2018, 34(10): 1781-1790.
Chemical composition | Mechanical properties (at 25 °C) | |||||||
---|---|---|---|---|---|---|---|---|
Alloys | Cr | Co | Ni | N | Yield strength (MPa) | Ultimate tensile strength (MPa) | Elongation (%) | |
CrCoNi | wt% | 30.58 | 34.71 | 34.71 | - | 205.6 | 638.6 | 68.9 |
at% | 33.25 | 33.31 | 33.44 | - | ||||
CrCoNiN | wt% | 30.45 | 34.56 | 34.55 | 0.44 | 374.4 | 1161.1 | 43.0 |
at% | 32.68 | 32.73 | 32.84 | 1.75 |
Table 1 Chemical compositions and mechanical properties of the investigated medium-entropy alloys.
Chemical composition | Mechanical properties (at 25 °C) | |||||||
---|---|---|---|---|---|---|---|---|
Alloys | Cr | Co | Ni | N | Yield strength (MPa) | Ultimate tensile strength (MPa) | Elongation (%) | |
CrCoNi | wt% | 30.58 | 34.71 | 34.71 | - | 205.6 | 638.6 | 68.9 |
at% | 33.25 | 33.31 | 33.44 | - | ||||
CrCoNiN | wt% | 30.45 | 34.56 | 34.55 | 0.44 | 374.4 | 1161.1 | 43.0 |
at% | 32.68 | 32.73 | 32.84 | 1.75 |
Alloys | Temperature (°C) | Potentiodynamic polarization | Cyclic polarization | |||
---|---|---|---|---|---|---|
Icorr × 107 (A/cm2) | Epit (mVSCE) | Epit (mVSCE) | Erp (mVSCE) | Imax (mA/cm2) | ||
CrCoNi | 30 | 1.40 ± 0.33 | 744.9 ± 2.6 | 762.8 ± 2.2 | Epit | 1.1 ± 0.0 |
50 | 2.85 ± 0.34 | 336.7 ± 24.6 | 421.3 ± 8.1 | 147.3 ± 19.2 | 3.4 ± 0.2 | |
70 | 3.18 ± 0.96 | 240.7 ± 16.1 | 270.0 ± 10.5 | 55.3 ± 6.8 | 3.6 ± 0.9 | |
CrCoNiN | 30 | 1.39 ± 0.35 | 782.4 ± 9.7 | 763.1 ± 1.3 | Epit | 1.0 ± 0.0 |
50 | 2.34 ± 0.44 | 712.0 ± 8.7 | 711.6 ± 4.0 | Epit | 1.0 ± 0.0 | |
70 | 2.75 ± 0.77 | 663.4 ± 35.1 | 660.9 ± 0.8 | Epit | 1.0 ± 0.0 |
Table 2 Potentiodynamic and cyclic polarization parameters of the investigated medium-entropy alloys.
Alloys | Temperature (°C) | Potentiodynamic polarization | Cyclic polarization | |||
---|---|---|---|---|---|---|
Icorr × 107 (A/cm2) | Epit (mVSCE) | Epit (mVSCE) | Erp (mVSCE) | Imax (mA/cm2) | ||
CrCoNi | 30 | 1.40 ± 0.33 | 744.9 ± 2.6 | 762.8 ± 2.2 | Epit | 1.1 ± 0.0 |
50 | 2.85 ± 0.34 | 336.7 ± 24.6 | 421.3 ± 8.1 | 147.3 ± 19.2 | 3.4 ± 0.2 | |
70 | 3.18 ± 0.96 | 240.7 ± 16.1 | 270.0 ± 10.5 | 55.3 ± 6.8 | 3.6 ± 0.9 | |
CrCoNiN | 30 | 1.39 ± 0.35 | 782.4 ± 9.7 | 763.1 ± 1.3 | Epit | 1.0 ± 0.0 |
50 | 2.34 ± 0.44 | 712.0 ± 8.7 | 711.6 ± 4.0 | Epit | 1.0 ± 0.0 | |
70 | 2.75 ± 0.77 | 663.4 ± 35.1 | 660.9 ± 0.8 | Epit | 1.0 ± 0.0 |
Alloys | Contents of main alloying elements (wt%) | CPT (°C) | Testing solutions | |||
---|---|---|---|---|---|---|
Cr | Mo | N | Ni | |||
304 [ | 18 | / | / | 9 | 4.6 | 1 M NaCl |
316L [ | 17.13 | 2.15 | / | 12.7 | 17.2 | 3.5 wt% NaCl |
904L [ | 20.06 | 4.32 | / | 25.04 | 51.1 | 1 M NaCl |
2101DSS [ | 21.4 | 0.31 | 0.23 | 1.2 | 33 | 1 M NaCl |
2304DSS [ | 23.23 | 0.42 | 0.12 | 4.8 | 33 | 1 M NaCl |
Table 3 Main alloying element contents and CPT values of commercial stainless steels in literatures.
Alloys | Contents of main alloying elements (wt%) | CPT (°C) | Testing solutions | |||
---|---|---|---|---|---|---|
Cr | Mo | N | Ni | |||
304 [ | 18 | / | / | 9 | 4.6 | 1 M NaCl |
316L [ | 17.13 | 2.15 | / | 12.7 | 17.2 | 3.5 wt% NaCl |
904L [ | 20.06 | 4.32 | / | 25.04 | 51.1 | 1 M NaCl |
2101DSS [ | 21.4 | 0.31 | 0.23 | 1.2 | 33 | 1 M NaCl |
2304DSS [ | 23.23 | 0.42 | 0.12 | 4.8 | 33 | 1 M NaCl |
Fig. 7. XPS spectra of Cr 2p3/2, Co 2p3/2, Ni 2p3/2 and O 1 s recorded from the outmost surface of passive films on (a) CrCoNi and (b) CrCoNiN medium-entropy alloys.
Fig. 8. XPS spectra of N 1 s recorded from the sputtering surfaces for (a) 0 s, (b) 10 s, (c) 70 s and (d) 170 s of the passive film on CrCoNiN medium-entropy alloy.
Elements | Alloys | Etching time (s) | |||
---|---|---|---|---|---|
0 | 10 | 20 | 30 | ||
Ni | CrCoNi | 5.75 | 25.06 | 31.66 | 31.14 |
CrCoNiN | 7.74 | 17.28 | 26.49 | 32.53 | |
Co | CrCoNi | 4.51 | 21.85 | 29.26 | 33.92 |
CrCoNiN | 3.24 | 13.20 | 18.36 | 24.28 | |
Cr | CrCoNi | 8.24 | 21.02 | 18.03 | 16.36 |
CrCoNiN | 8.44 | 23.92 | 23.10 | 19.36 |
Table 4 Contents of Ni, Co and Cr elements in the passive films on medium-entropy alloys (at%).
Elements | Alloys | Etching time (s) | |||
---|---|---|---|---|---|
0 | 10 | 20 | 30 | ||
Ni | CrCoNi | 5.75 | 25.06 | 31.66 | 31.14 |
CrCoNiN | 7.74 | 17.28 | 26.49 | 32.53 | |
Co | CrCoNi | 4.51 | 21.85 | 29.26 | 33.92 |
CrCoNiN | 3.24 | 13.20 | 18.36 | 24.28 | |
Cr | CrCoNi | 8.24 | 21.02 | 18.03 | 16.36 |
CrCoNiN | 8.44 | 23.92 | 23.10 | 19.36 |
Fig. 9. Peak areas of species in (a) Cr 2p3/2 in the passive films on CrCoNi and CrCoNiN medium-entropy alloys and (b) N 1 s in the passive films on CrCoNiN alloy.
Fig. 10. Schematic diagram of physicochemical processes based on PDM model. m = metal atom, VMx′ = cation vacancy, MM = metal cation in cation site, Vm = vacancy in metal site, Mix+ = cation interstitial, VO¨ = oxygen vacancy, Mδ+ (aq) = metal cation in electrolyte, OO = oxygen ion in anion site, Cl- (aq) = chloride ion in electrolyte, Clo˙ = oxygen vacancy occupied by Cl-, N = nitrogen atom, N? = nitrogen ion.
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