Study on the Microstructure Evolution and Tungsten Content Optimization of 9Cr-3W-3Co Steel
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Heat Treatments
2.2. Creep Tests and Microstructure Observations
3. Results
3.1. Precipitation Evolution of 9Cr-3W-3Co Steel
3.2. Lath Substructure Evolution of 9Cr-3W-3Co Steel
4. Discussion
4.1. Dislocations, Accelerated Coarsening and Recovery Process
4.2. Thermodynamic Calculation and Improvement of Creep-Rupture Strength
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Heat | C | Si | Mn | P | S | Cr | W | Co | V | Nb | N | B | Cu |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
N# | 0.080 | 0.36 | 0.58 | 0.0025 | 0.0016 | 9.03 | 2.96 | 3.02 | 0.20 | 0.058 | 0.0049 | 0.015 | 0.90 |
LW2# | 0.088 | 0.23 | 0.52 | 0.0023 | 0.0017 | 8.88 | 2.63 | 3.02 | 0.20 | 0.051 | 0.0088 | 0.015 | 0.91 |
LW1# | 0.082 | 0.20 | 0.53 | 0.0027 | 0.0013 | 8.81 | 2.32 | 3.00 | 0.20 | 0.050 | 0.0097 | 0.012 | 1.03 |
Stress, MPa | Creep Rupture Time, h | ||
---|---|---|---|
N | LW1 | LW2 | |
200 | 134 | 100 | 36 |
180 | 837 | 659 | 420 |
160 | 3037 | 4082 | 2243 |
140 | 6667 | 8791 | 8635 |
120 | 18,551 | >14,000 | >14,000 |
100 | >35,000 | – | – |
Tensile Property | N# (2.96% W) | LW1 (2.63% W) | LW2 (2.32% W) |
---|---|---|---|
Yield strength (Rp0.2), MPa | 366 | 335 | 340 |
Ultimate strength (Rm), MPa | 391 | 387 | 385 |
Area reduction (Z), % | 27.5 | 28 | 35 |
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Ma, L.; Wang, Y.; Di, G. Study on the Microstructure Evolution and Tungsten Content Optimization of 9Cr-3W-3Co Steel. Materials 2018, 11, 2080. https://doi.org/10.3390/ma11112080
Ma L, Wang Y, Di G. Study on the Microstructure Evolution and Tungsten Content Optimization of 9Cr-3W-3Co Steel. Materials. 2018; 11(11):2080. https://doi.org/10.3390/ma11112080
Chicago/Turabian StyleMa, Longteng, Yanfeng Wang, and Guobiao Di. 2018. "Study on the Microstructure Evolution and Tungsten Content Optimization of 9Cr-3W-3Co Steel" Materials 11, no. 11: 2080. https://doi.org/10.3390/ma11112080