The Mechanism of the High Resistance to Hydrogen-Induced Strength Loss in Ultra-High Strength High-Entropy Alloy
Abstract
:1. Introduction
2. Materials and Methods
3. Results
4. Discussion
5. Conclusions
- (1)
- Compared to high-strength martensite steel 22MnB5 with a similar strength level, Al0.5Cr0.9FeNi2.5V0.2 shows less strength loss after hydrogen charging and exhibits better resistance against hydrogen-induced strength loss.
- (2)
- The fracture surfaces of uncharged and hydrogen-charged Al0.5Cr0.9FeNi2.5V0.2 are characterized by dimples and no intergranular morphology is observed, mainly due to the HELP mechanism. The fracture mode of 22MnB5 steel changes from the dimple characteristic to the entire intergranular fracture feature after hydrogen charging, and the HEDE mechanism plays the predominant role in the fracture process.
- (3)
- Dispersed nano-structured precipitates and high-density dislocations hindered the aggregation of hydrogen, and this coupling effect effectively improves the resistance of Al0.5Cr0.9FeNi2.5V0.2 to hydrogen-induced strength loss.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Sample | Yield Strength (σs)/MPa | Tensile Strength (σb)/MPa | Total Elongation (δ)/% | Hydrogen Content (CH)/wppm |
---|---|---|---|---|
Hydrogen-Uncharged | 1630.8 | 2073.6 | 6.0 | 0.2 |
Hydrogen-Charged | 1554.7 | 1691.7 | 0.4 | 15.3 |
Sample | Yield Strength (σs)/MPa | Tensile Strength (σb)/MPa | Total Elongation (δ)/% | Hydrogen Content (CH)/wppm |
---|---|---|---|---|
Hydrogen-Uncharged | 1179.4 | 1582.5 | 9.0 | 0.1 |
Hydrogen-Charged | - | 732.8 | 0.2 | 1.8 |
Steels | Hydrogen Charging and SSRT Conditions | Tensile Stress (σb)/MPa | Tensile Strength Loss/% | Fracture Mode | Ref. | |||||
---|---|---|---|---|---|---|---|---|---|---|
Hydrogen-Charging Method | Charging Solution | Current Density (mA/cm2) or Cathodic Potential (V) | Time (h) | Strain Rate (s−1) | Hydrogen Content (wppm) | |||||
Screw-thread steel | Pre-charging | 0.5 mol/L H2SO4 + 1 g/L CH4N2S | 0.3 mA/cm2 | 24 | 2 × 10−5 | 23.0 | ~1500 | ~65.0 | Intergranular and quasi-cleavage | [21] |
18Ni (300) maraging steel | Pre-charging and dynamic hydrogen charging | 0.6 M NaCl | −1.2 VSCE (0.32 mA/cm2) | 24 | 1 × 10−6 | - | 1950 | 68.6 | Intergranular and quasi-cleavage | [23] |
TM210 maraging steel | Dynamic hydrogen charging | 0.2 mol/L NaOH + 0.22 g/L CH4N2S | 0.5 mA/cm2 | - | 1 × 10−7 | 1.16 | 1970 | 63.6 | Intergranular | [22] |
18Ni (300) maraging steel | Pre-charging and dynamic hydrogen charging | 0.6 M NaCl | −1.2 VSCE (0.32 mA/cm2) | 24 | 1 × 10−6 | - | 2180 | 61.5 | Intergranular and ductile transgranular | [24] |
Maraging steel (Marval 18) | Pre-charging | 3% NaCl + 0.3% NH4SCN | 0.2 mA/cm2 | 160 | 1 × 10−7 ~ 1 × 10−4 | 4.7 | 2030 | ~52.5 | Intergranular | [25] |
18Ni (300) maraging steel | Pre-charging | 0.6 M NaCl | −0.42 VSCE | 24 | 1 × 10−5 | - | 1873 | 50.4 | Intergranular and quasi-cleavage | [26] |
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Gao, Z.; Xue, Y.; Li, J.; Xu, L.; Qiao, L. The Mechanism of the High Resistance to Hydrogen-Induced Strength Loss in Ultra-High Strength High-Entropy Alloy. Metals 2022, 12, 971. https://doi.org/10.3390/met12060971
Gao Z, Xue Y, Li J, Xu L, Qiao L. The Mechanism of the High Resistance to Hydrogen-Induced Strength Loss in Ultra-High Strength High-Entropy Alloy. Metals. 2022; 12(6):971. https://doi.org/10.3390/met12060971
Chicago/Turabian StyleGao, Zhenhuan, Yunfei Xue, Jinxu Li, Lining Xu, and Lijie Qiao. 2022. "The Mechanism of the High Resistance to Hydrogen-Induced Strength Loss in Ultra-High Strength High-Entropy Alloy" Metals 12, no. 6: 971. https://doi.org/10.3390/met12060971