Experimental Investigation of Fatigue Crack Growth Behavior of the 2.25Cr1Mo0.25V Steel Welded Joint Used in Hydrogenation Reactors
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructures
3.2. FCG Behavior
3.3. Fracture Morphology
3.4. Acoustic Emission Analysis
4. Conclusions
- The microstructure of BM is fine granular bainite, while the WM shows coarser bainite grains. The HAZ exhibits the most significantly inhomogeneity, with large dispersion of grain size.
- The FCGRs of HAZ specimen are approximately two times higher at low ΔK values than those of BM and WM, which could be attributed to non-uniform microstructure with much coarser grains. The BM shows the most superior fatigue resistance, which is due to the fine equiaxed bainite grains. The relationship between FCGR and ΔK follows the Paris law.
- SEM analyses reveal the transgranular fracture with fatigue striations as the dominant fracture mechanism for all specimens. Moreover, the fracture surface of the WM specimen shows a significantly larger density of secondary cracks with large size compared to BM and HAZ specimens.
- The FCG in the WM specimen generates more AE activity with higher energy values of AE signals compared to BM and HAZ specimens. This is attributed to the combined influence of the formation of numerous secondary cracks and coarse-grained microstructures.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Yield Strength (MPa) | Ultimate Strength (MPa) | Percentage of Elongation (%) | Percentage of Area Reduction (%) |
---|---|---|---|
569 | 678 | 29 | 81 |
Element | C | Si | Mn | P | S | Cr | Mo | V | Al | Ni | Cu |
---|---|---|---|---|---|---|---|---|---|---|---|
BM | 0.15 | 0.10 | 0.54 | 0.009 | 0.01 | 2.30 | 0.98 | 0.30 | 0.05 | - | - |
WM | 0.12 | 0.22 | 1.07 | 0.004 | 0.004 | 2.45 | 1.03 | 0.42 | - | 0.03 | 0.11 |
Specimen | C | m | R2 |
---|---|---|---|
BM | 6.309−10 | 3.454 | 0.986 |
HAZ | 8.433−9 | 2.772 | 0.899 |
WM | 2.564−10 | 3.746 | 0.950 |
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Song, Y.; Chai, M.; Han, Z. Experimental Investigation of Fatigue Crack Growth Behavior of the 2.25Cr1Mo0.25V Steel Welded Joint Used in Hydrogenation Reactors. Materials 2021, 14, 1159. https://doi.org/10.3390/ma14051159
Song Y, Chai M, Han Z. Experimental Investigation of Fatigue Crack Growth Behavior of the 2.25Cr1Mo0.25V Steel Welded Joint Used in Hydrogenation Reactors. Materials. 2021; 14(5):1159. https://doi.org/10.3390/ma14051159
Chicago/Turabian StyleSong, Yan, Mengyu Chai, and Zelin Han. 2021. "Experimental Investigation of Fatigue Crack Growth Behavior of the 2.25Cr1Mo0.25V Steel Welded Joint Used in Hydrogenation Reactors" Materials 14, no. 5: 1159. https://doi.org/10.3390/ma14051159