Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal
Abstract
:1. Introduction
2. Experimental
2.1. Materials and Welding Patameters
2.2. Thermal Expansion Experiment
2.3. Procedure for Post-Weld Heat Treatment (PWHT)
2.4. Charpy Impact Toughness Experiment
2.5. Microstructural Analyses
2.6. In Situ Observation of Microstructure Evolution
3. Experimental Results
3.1. The Microstructure of the Weld Metals
3.2. Mechanical Properties of the Weld Metals
3.3. Fracture Surface of the Impact Specimens
3.4. Effective Microstructure for Determining Impact Toughness
3.5. In Situ Observation of Microstructure Evolution
3.6. Improving the Low-Temperature Toughness of the Weld Metals
4. Discussion
4.1. The Effect of Type of the Microstructure on Mechanical Properties of the Weld Metals
4.2. The Effect of Ferrite Grain Size on Impact Toughness of the Weld Metals
4.3. The Effect of Prior Austenite on Low-Temperature Impact Toughness of the Weld Metals
4.4. The Effect of Mn Content and Inclusions on the Low-Temperature Impact Toughness of the Weld Metals
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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C | Mn | Si + Cr + Mo + Ni + V | S + P |
---|---|---|---|
0.094 | 1.04 | 3.9 | 0.0101 |
Specimens | YS(MPa) | UTS(MPa) | Ψ(%) | Charpy Impact Energy (J) |
---|---|---|---|---|
As-welded | 709 | 965 | 64% | 6, 6, 7 (−30 °C) |
PWHT | 581 | 695 | 71% | 24, 32, 36 (−30 °C) |
Standard (BM) | ≥ 415 | 585–760 | ≥ 45 | ≥54 (−18 °C) |
As-Welded | Impact Toughness (−30 °C) (J) | xf (μm) | SCL (μm) | SZW (μm) | Xf (μm) |
---|---|---|---|---|---|
1 | 6 | 188.6 | 31.1 | 47.7 | 267.4 |
2 | 6 | 258 | 29 | 31.1 | 318.1 |
3 | 7 | 185.8 | 37.3 | 65.3 | 288.4 |
PWHT | Impact toughness (−30 °C) (J) | xf (μm) | SCL (μm) | SZW (μm) | Xf (μm) |
1 | 30 | 587.7 | 365 | 117.5 | 1070.2 |
2 | 32 | 458 | 432 | 267.7 | 1157.7 |
3 | 36 | 504.4 | 511 | 286.4 | 1301.8 |
HM(Mn1.27wt%) | Impact toughness (−30 °C) (J) | xf (μm) | SCL (μm) | SZW (μm) | Xf (μm) |
1 | 95 | 571 | 1119.2 | 340.4 | 2030.6 |
2 | 132 | 830 | 2267.3 | 271.2 | 3368.5 |
3 | 157 | 629.2 | 3160.9 | 219.5 | 4009.6 |
O | Mn | Si | C | Al | Fe | V | Al | Mo |
---|---|---|---|---|---|---|---|---|
41.73 | 21.92 | 16.79 | 6.11 | 3.58 | 4.03 | 3.92 | 3.58 | 1.82 |
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Wu, K.; Yan, Y.; Cao, R.; Li, X.; Jiang, Y.; Yang, F.; Jia, X.; Chen, J. Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal. Materials 2020, 13, 3013. https://doi.org/10.3390/ma13133013
Wu K, Yan Y, Cao R, Li X, Jiang Y, Yang F, Jia X, Chen J. Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal. Materials. 2020; 13(13):3013. https://doi.org/10.3390/ma13133013
Chicago/Turabian StyleWu, Kefan, Yingjie Yan, Rui Cao, Xinyu Li, Yong Jiang, Fei Yang, Xingwang Jia, and Jianhong Chen. 2020. "Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal" Materials 13, no. 13: 3013. https://doi.org/10.3390/ma13133013