Superior Creep Resistance and Remnant Strength of Novel Tempered Ferritic-Martensitic Steels Designed by Element Addition
Abstract
:1. Introduction
2. Experimental Procedures
3. Results
3.1. Creep Properties
3.2. Tensile Properties after Prior Creep
3.3. Optical Morphologies after Creep
3.4. TEM Microstructures after Creep
3.5. Distribution of Chemical Compositions after Creep
4. Discussion
4.1. Preferential Partitioning of Cr to Cementite/Carbides
4.2. Suppression of Carbide Coarsening
4.3. Enhanced Creep Resistance and Remnant Tensile Strength
5. Conclusions
- (1)
- Unlike the degraded remnant tensile strength in the 0Cr samples, prior creep history in the 1Cr samples enables subsequent tensile yield strength of around ~940 MPa without obvious degradation. When the addition of Cr element is further increased to 13 wt.%, prior creep history enhances remnant tensile strength from ~840 MPa to ~960 MPa with prolonged creep time from 0 h to 96 h.
- (2)
- The coarsening of cementite particles is remarkably retarded in the 1Cr samples after creep in comparison to that in the 0Cr samples. For the 13Cr samples, however, the microstructure undergoes precipitation of carbide particles without the occurrence of coarsening due to a much slower precipitation response.
- (3)
- Cr element is prone to be segregated into the precipitate particles. The cementite in the 0Cr samples is evolved to alloyed cementite when 1 wt.% Cr is added, whereas carbide particles are formed when the addition content is increased to 13 wt.%. The intrinsic thermal stability possessed by both alloyed cementite and carbides continuously favors a precipitation-strength effect, which synchronously slows down the creep rate and enhances remnant tensile strength.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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C | Si | Mn | P | S | Cr | Mo | Ni | Nb V Ti | Cu | Al | |
---|---|---|---|---|---|---|---|---|---|---|---|
0Cr | 0.26 | 0.24 | 1.27 | 0.015 | 0.0018 | 0.042 | 0.008 | 0.020 | ≤0.0079 | 0.053 | 0.016 |
1Cr | 0.17 | 0.24 | 0.98 | 0.011 | 0.0034 | 0.99 | 0.33 | 0.059 | 0.019/0.029/0.013 | 0.21 | 0.017 |
13Cr | 0.26 | 0.19 | 0.17 | 0.011 | 0.0002 | 12.4 | 2.04 | 5.6 | 0.0001/0.013/0.0002 | 0.06 | 0.033 |
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Wang, H.; Li, K.; Chen, W.; Han, L.; Feng, Y. Superior Creep Resistance and Remnant Strength of Novel Tempered Ferritic-Martensitic Steels Designed by Element Addition. Materials 2022, 15, 3327. https://doi.org/10.3390/ma15093327
Wang H, Li K, Chen W, Han L, Feng Y. Superior Creep Resistance and Remnant Strength of Novel Tempered Ferritic-Martensitic Steels Designed by Element Addition. Materials. 2022; 15(9):3327. https://doi.org/10.3390/ma15093327
Chicago/Turabian StyleWang, Hang, Keer Li, Wei Chen, Lihong Han, and Yaorong Feng. 2022. "Superior Creep Resistance and Remnant Strength of Novel Tempered Ferritic-Martensitic Steels Designed by Element Addition" Materials 15, no. 9: 3327. https://doi.org/10.3390/ma15093327