Hydrogen Trapping Behavior in Vanadium Microalloyed TRIP-Assisted Annealed Martensitic Steel
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Materials
2.2. Hydrogen Charging Method
2.3. Slow Strain Rate Tensile Tests (SSRT)
2.4. Hydrogen Analysis
3. Results
3.1. Microstructural
3.2. Hydrogen Permeation Test
3.3. SSRT Behaviors
3.4. TDA Results
4. Discussion
4.1. Nature of Hydrogen Trapping
4.2. Synergistic Effect of Hydrogen Trap and RA on Ductility Loss
5. Conclusions
- (1)
- Hydrogen trap sites of V-added steel with annealled martensite structure are estimated to be vanadium carbide.This vanadium carbide is acting as reversible hydrogen traps. The peak temperature for de-tapping of hydrogen approximates 170 °C for all three vanadium-added steels.
- (2)
- Apparent hydrogen diffusive index Da and total trapped hydrogen content increasig with vanadium addition. Da was 1.94 × 10−7/cm2·s−1 for 0.21 wt.%V steel, while the value was 8.05 × 10−7/cm2·s−1 for V-free steel. The total trapped hydrogen are 7 ppm, 8.6 ppm, and 11.25 ppm for 0.052%V, 0.098%V, and 0.21%V steels, respectively. And there is a clear linear relation between Htotal and vanadium addition.
- (3)
- High volume fraction of effective-size precipatites are the essential for acting as hydrogen trapping sites.
- (4)
- The hydrogen induced ductility loss ID was 76.2% for 0.21 wt.%V steel, compared with 86.5% for V-free steel. However, the 0.098%V addition can achieve balancedcombination of high strength and elongation with excellent resistance to hydrogen induced delayed fracture.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Elements | C | Si | Mn | P | S | V | Ti | N |
---|---|---|---|---|---|---|---|---|
TAM-V0 | 0.19 | 1.42 | 2.02 | 0.007 | 0.005 | - | 0.030 | 0.0037 |
TAM-V5 | 0.20 | 1.53 | 2.10 | 0.006 | 0.005 | 0.052 | 0.024 | 0.0036 |
TAM-V10 | 0.20 | 1.50 | 2.10 | 0.005 | 0.006 | 0.098 | 0.030 | 0.0039 |
TAM-V20 | 0.20 | 1.54 | 2.05 | 0.007 | 0.005 | 0.21 | 0.029 | 0.0045 |
Critical Points | TAM-V0 | TAM-V5 | TAM-V10 | TAM-V20 |
---|---|---|---|---|
Ac1 | 744 | 740 | 745 | 750 |
Ac3 | 865 | 870 | 875 | 878 |
MsC | 402 | 398 | 397 | 398 |
Steels | Sample Thickness L/mm | I∞/µA | 0.63I∞/µA | t0.63/s |
---|---|---|---|---|
TAM-V0 | 0.31 | 33.05 | 20.82 | 199 |
TAM-V5 | 0.31 | 34.81 | 21.93 | 357 |
TAM-V10 | 0.32 | 35.85 | 22.59 | 644 |
TAM-V20 | 0.31 | 36.5 | 23.00 | 826 |
Steels | Da × 10−7/cm2·s−1 | J∞ × 10−10/mol·cm−2·s−1 | |
---|---|---|---|
TAM-V0 | 8.05 | 4.36 | 1.68 |
TAM-V5 | 4.49 | 4.59 | 3.18 |
TAM-V10 | 2.65 | 4.73 | 5.72 |
TAM-V20 | 1.94 | 4.82 | 7.70 |
Steels | Charging Conditions | Rm/MPa | A/% | IT | ID |
---|---|---|---|---|---|
TAM-V0 | Uncharging | 1002 | 28.93 | 37.4 | 86.5 |
5 mA/cm2 | 760 | 3.87 | |||
TAM-V5 | Uncharging | 1106 | 25.70 | 29.8 | 83.4 |
5 mA/cm2 | 776 | 4.26 | |||
TAM-V10 | Uncharging | 1224 | 21.33 | 30.6 | 76.2 |
5 mA/cm2 | 850 | 5.08 | |||
TAM-V20 | Uncharging | 1191 | 18.67 | 31.2 | 76.2 |
5 mA/cm2 | 819 | 4.45 |
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Yang, X.; Yu, H.; Song, C.; Li, L. Hydrogen Trapping Behavior in Vanadium Microalloyed TRIP-Assisted Annealed Martensitic Steel. Metals 2019, 9, 741. https://doi.org/10.3390/met9070741
Yang X, Yu H, Song C, Li L. Hydrogen Trapping Behavior in Vanadium Microalloyed TRIP-Assisted Annealed Martensitic Steel. Metals. 2019; 9(7):741. https://doi.org/10.3390/met9070741
Chicago/Turabian StyleYang, Xiongfei, Hao Yu, Chenghao Song, and Lili Li. 2019. "Hydrogen Trapping Behavior in Vanadium Microalloyed TRIP-Assisted Annealed Martensitic Steel" Metals 9, no. 7: 741. https://doi.org/10.3390/met9070741