High-Temperature Tempered Martensite Embrittlement in Quenched-and-Tempered Offshore Steels
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Quenched and Tempered Microstructure
3.2. Mechanical Properties of Offshore Steels
3.3. Analysis of Kernel Average Misorientation (KAM)
3.4. Investigations by Transmission Kikuchi Diffraction (TKD)
4. Discussion
- The level of martensite coalescence is higher in S690Q steel;
- Lenticular martensite forms as M/A phases in S690Q steel, whereas lath martensite forms as M/A phases in NiCu steel;
- M/A phases form primarily along prior austenite grain boundaries or packet boundaries in S690Q steel, whereas M/A phases primarily form along lath boundaries in NiCu steel;
- Copper particles form in NiCu steel.
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
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Fe | C | Si | Mn | Cr | Ni | Mo | Cu | Al | Ti + Nb | N | |
---|---|---|---|---|---|---|---|---|---|---|---|
S690Q 1 | Bal. | 0.08–0.16 | 0.20–0.40 | 0.90–1.00 | <0.65 | 0.80–1.00 | <0.50 | 0.10–0.40 | <0.08 | <0.04 | <0.009 |
Fe | C | Si | Mn | Cr | Ni | Mo | Cu | Al | Ti + Nb + V | N | |
NiCu 2 | Bal. | 0.04–0.08 | 0.20–0.40 | 0.90–1.00 | <0.65 | 2.5–3.5 | <0.50 | 1.0–2.0 | <0.08 | <0.06 | <0.009 |
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Yen, H.-W.; Chiang, M.-H.; Lin, Y.-C.; Chen, D.; Huang, C.-Y.; Lin, H.-C. High-Temperature Tempered Martensite Embrittlement in Quenched-and-Tempered Offshore Steels. Metals 2017, 7, 253. https://doi.org/10.3390/met7070253
Yen H-W, Chiang M-H, Lin Y-C, Chen D, Huang C-Y, Lin H-C. High-Temperature Tempered Martensite Embrittlement in Quenched-and-Tempered Offshore Steels. Metals. 2017; 7(7):253. https://doi.org/10.3390/met7070253
Chicago/Turabian StyleYen, Hung-Wei, Meng-Hsuan Chiang, Yu-Chen Lin, Delphic Chen, Ching-Yuan Huang, and Hsin-Chih Lin. 2017. "High-Temperature Tempered Martensite Embrittlement in Quenched-and-Tempered Offshore Steels" Metals 7, no. 7: 253. https://doi.org/10.3390/met7070253