Effect of Tempering Time on Carbide Evolution and Mechanical Properties of a Nb-V-Ti Micro-Alloyed Steel
Abstract
:1. Introduction
2. Experimental
3. Results and Discussion
3.1. Microstructure Evolution under Different Tempering Times
3.2. Precipitation Behavior of Carbide under Different Tempering Times
3.3. Mechanical Properties under Different Tempering Times
4. Conclusions
- The width of martensite laths increased and the retained austenite and dislocation decreased gradually with the prolongation of the tempering time.
- The evolution sequence of the carbides during tempering at 600 °C for the different times was identified as: M3C → M2C → M7C3 → M23C6. The other two kinds of MC carbides remained stable during the tempering process.
- The strength decreased and the Charpy impact toughness increased gradually with the prolongation of the tempering time. The Vickers hardness increased remarkably as the tempering time was extended to 1 h and then decreased sharply with a further increase in the tempering time up to 5 h. When the tempering time was between 5 and 100 h, the Vickers hardness values decreased gradually.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Tempering Time | YS, MPa | UTS, MPa | TE, % |
---|---|---|---|
10 min | 1138 ± 16 | 1231 ± 20 | 8.8 ± 0.3 |
30 min | 1112 ± 12 | 1193 ± 18 | 8.4 ± 0.2 |
5 h | 1055 ± 14 | 1132 ± 21 | 11.5 ± 0.5 |
100 h | 835 ± 11 | 896 ± 15 | 12.3 ± 0.6 |
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Zhao, Q.; Qiao, Z.; Dong, J. Effect of Tempering Time on Carbide Evolution and Mechanical Properties of a Nb-V-Ti Micro-Alloyed Steel. Metals 2023, 13, 1495. https://doi.org/10.3390/met13081495
Zhao Q, Qiao Z, Dong J. Effect of Tempering Time on Carbide Evolution and Mechanical Properties of a Nb-V-Ti Micro-Alloyed Steel. Metals. 2023; 13(8):1495. https://doi.org/10.3390/met13081495
Chicago/Turabian StyleZhao, Qian, Zhixia Qiao, and Ji Dong. 2023. "Effect of Tempering Time on Carbide Evolution and Mechanical Properties of a Nb-V-Ti Micro-Alloyed Steel" Metals 13, no. 8: 1495. https://doi.org/10.3390/met13081495