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Relation between the Fatigue and Fracture Ductile-Brittle Transition in S500 Welded Steel Joints

Sallaba, Finn and Rolof, Franziska and Ehlers, Sören and Walters, Carey Leroy and Braun, Moritz (2022) Relation between the Fatigue and Fracture Ductile-Brittle Transition in S500 Welded Steel Joints. Metals, 12, p. 385. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/met12030385. ISSN 2075-4701.

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Official URL: https://www.mdpi.com/journal/metals

Abstract

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.

Item URL in elib:https://elib.dlr.de/185423/
Document Type:Article
Title:Relation between the Fatigue and Fracture Ductile-Brittle Transition in S500 Welded Steel Joints
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Sallaba, FinnInstitute of Ship Structural Design and Analysis, Hamburg University of TechnologyUNSPECIFIEDUNSPECIFIED
Rolof, FranziskaInstitute of Ship Structural Design and Analysis, Hamburg University of TechnologyUNSPECIFIEDUNSPECIFIED
Ehlers, SörenUNSPECIFIEDhttps://orcid.org/0000-0001-5698-9354UNSPECIFIED
Walters, Carey LeroyDepartment of Maritime and Transport Technology, Delft University of TechnologyUNSPECIFIEDUNSPECIFIED
Braun, MoritzInstitute of Ship Structural Design and Analysis, Hamburg University of TechnologyUNSPECIFIEDUNSPECIFIED
Date:23 February 2022
Journal or Publication Title:Metals
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:12
DOI:10.3390/met12030385
Page Range:p. 385
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
Lee, Jae MyungUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Series Name:Metals
ISSN:2075-4701
Status:Published
Keywords: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
HGF - Research field:Energy
HGF - Program:other
HGF - Program Themes:E - no assignment
DLR - Research area:Energy
DLR - Program:E - no assignment
DLR - Research theme (Project):E - no assignment
Location: Geesthacht
Institutes and Institutions:Institute of Maritime Energy Systems
Deposited By: Ortner, Dr.rer.nat. Jürgen
Deposited On:09 Mar 2022 11:50
Last Modified:09 Mar 2022 11:50

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