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Relation between the fatigue and fracture ductile-brittle transition in S500 welded steel joints
Citation Link: https://doi.org/10.15480/882.4190
Publikationstyp
Journal Article
Publikationsdatum
2022-02-23
Sprache
English
Herausgeber*innen
Enthalten in
Volume
12
Issue
3
Article Number
385
Citation
Metals 12 (3): 385 (2022)
Publisher DOI
Publisher
Multidisciplinary Digital Publishing Institute
The formation and propagation of cracks occur through irreversible dislocation movements at notches, material defects, and grain boundaries. Since this process is partly thermally controlled, the resistance to dislocation movements at low temperatures increases. This slows both fatigue initiation and fatigue crack propagation. From recent experimental data, it can be seen that fatigue crack growth is accelerated below the fatigue transition temperature (FTT) that correlates with the ductile-brittle transition temperature (DBTT) found by well-known fracture mechanics tests, i.e., Charpy impact, fracture toughness, and CTOD. Hence, this study investigates the relation between FTT and DBTT in S500 high-strength steel base material and welded joints at low temperatures using fatigue crack growth, fracture toughness tests as well as scanning electron microscopy. From the tests, an almost constant decrease in fatigue crack propagation rate is determined with decreasing test temperature even below the DBTT. At −100 °C, the fatigue crack propagation rate is about half of the rate observed at room temperature for both base material and weld metal.
Schlagworte
arctic conditions
weldment fatigue
temperature dependence of material fatigue
fatigue and fracture mechanics testing at low temperatures
fatigue and fracture transitions temperatures
direct-current potential drop method
scanning electron microscopy
fracture toughness testing
structural steel
DDC Class
600: Technik
620: Ingenieurwissenschaften
More Funding Information
This research received no external funding.
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