Effect of Spherical θ Precipitation in 1.5 GPa Grade Tempered Martensitic Steel on the Occurrence of Delayed Fracture
Abstract
:1. Introduction
2. Methods
2.1. Specimen
2.2. Evaluation Method of Delayed Fracture Characteristics
2.3. Observation of Microstructure around Spherical θ
2.4. Analysis of Hydrogen in Steel Sheets
2.5. Observation of Fracture Surface
3. Results
3.1. Material Properties
3.2. Delayed Fracture Conditions
3.3. Microstructure around Spherical θ
3.4. Thermal Desorption Curves
3.5. Fracture Surface of Steel with Spherical θ
4. Discussion
4.1. Local Deformation around Spherical θ after 30%-Rolling
4.2. Hydrogen State before and after 30%-Rolling
4.3. Promoted Void Generation around Spherical θ by Hydrogen
4.4. Crack Initiation from Spherical θ
5. Conclusions
- At 30% strain, 1 GPa stress, and hydrogen charging by the cathodic charging method, the steel sheets fractured at a current density of 0.6 A·m−2 or higher, but the steel sheets without spherical θ did not fracture even at a current density of 50 A·m−2.
- The GN dislocation density around spherical θ increased by 3.05 × 1014 m−2 after 30%-rolling compared to the entire matrix.
- In the hydrogen desorption curves, the 30%-rolling caused a peak around 250 °C. The amount of hydrogen in the 250 °C-peak was 0.87 mass ppm, while that in the steel without spherical θ was 0.29 mass ppm.
- The value of activation energy required for hydrogen desorption at the 250 °C-peak was 109.2 kJ·mol−1, which was close to the activation energy of 64~93 kJ·mol−1 for the θ/α disordered interface produced by wire drawing in the previous research.
- Voids and cracks were formed around the spherical θ near the fracture surface of the CLT specimen. The fracture surface was parallel to the {011}M crystal plane.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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C | Si | Mn | P | S | Cr | |
---|---|---|---|---|---|---|
Steel with spherical θ | 1.03 | 0.2 | 0.3 | 0.005 | ≤0.0007 | 0.14 |
Steel without spherical θ | 0.76 | 0.2 | 0.3 | 0.008 | ≤0.0007 | 0.14 |
Defects | Activation Energy (Eb)/kJ·mol−1 |
---|---|
Helical dislocation [32] | 20~30 |
Dislocation core [32] | 56.8 |
Atomic vacancy [21] | 51 |
Grain boundary (martensite) [25] | 50 |
θ interface in pearlite [23] | 19~ |
Spherical θ in pearlite [23] | 23 |
θ interface in martensite [25] | 41.5 |
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Ikegawa, J.; Wang, S.; Saito, K.; Kato, S.; Yamazaki, K.; Suzuki, S. Effect of Spherical θ Precipitation in 1.5 GPa Grade Tempered Martensitic Steel on the Occurrence of Delayed Fracture. Metals 2024, 14, 999. https://doi.org/10.3390/met14090999
Ikegawa J, Wang S, Saito K, Kato S, Yamazaki K, Suzuki S. Effect of Spherical θ Precipitation in 1.5 GPa Grade Tempered Martensitic Steel on the Occurrence of Delayed Fracture. Metals. 2024; 14(9):999. https://doi.org/10.3390/met14090999
Chicago/Turabian StyleIkegawa, Jin, Shiyu Wang, Ken Saito, Shinichi Kato, Kazuhiko Yamazaki, and Shinsuke Suzuki. 2024. "Effect of Spherical θ Precipitation in 1.5 GPa Grade Tempered Martensitic Steel on the Occurrence of Delayed Fracture" Metals 14, no. 9: 999. https://doi.org/10.3390/met14090999