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Fracture toughness of the lean duplex stainless steel LDX 2101
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-8494-3983
2006 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 37A, no 10, 2975-2981 p.Article in journal (Refereed) Published
Abstract [en]

Fracture toughness testing was performed on the recently developed lean duplex stainless steel LDX 2101 (EN 1.4162, UNS S32101). The results were evaluated by master curve analysis, including deriving a reference temperature. The master curve approach, originally developed for ferritic steels, has been used successfully. The reference temperature corresponds to a fracture toughness of 100 MPa √m, which characterizes the onset of cleavage cracking at elastic or elastic-plastic instabilities. The reference temperature, To, was -112 °C and -92 °C for the base and weld materials, respectively. In addition, the fracture toughness is compared with impact toughness results. Complementary crack tip opening displacements (CTODs) have also been calculated. The toughness properties found in traditional duplex stainless steels (DSS) are generally good. The current study verifies a high fracture toughness for both base and weld materials and for the low alloyed grade LDX 2101. Even though the fracture toughness was somewhat lower than for duplex stainless steel 2205, it is still sufficiently high for most low-temperature applications.

Place, publisher, year, edition, pages
2006. Vol. 37A, no 10, 2975-2981 p.
Keyword [en]
Crack tip opening displacements, Duplex stainless steels, Master curve analysis
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5733DOI: 10.1007/s11661-006-0179-7ISI: 000241000400008Scopus ID: 2-s2.0-33749586464OAI: oai:DiVA.org:kth-5733DiVA: diva2:10199
Note
QC 20100915. Uppdaterad från Manuskript till Artikel (20100915)Available from: 2006-05-15 Created: 2006-05-15 Last updated: 2010-09-15Bibliographically approved
In thesis
1. Fracture toughness properties of duplex stainless steels
Open this publication in new window or tab >>Fracture toughness properties of duplex stainless steels
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Good toughness properties in base and weld material enable the use of duplex stainless steels (DSS) in critical applications. DSS offer high strength compared to common austenitic stainless steels. The high strength can be utilized to reduce the wall thickness and accordingly accomplish reduction of cost, welding time and transportation weight, contributing to ecological and energy savings. Although DSS have been used successfully in many applications the last decades, the full utilisation in pressure vessels has been restricted due to conservative design rules. The consequences of failure in a pressure vessel are often very severe and it is accordingly important to verify a high ductility and fracture toughness.

In this study fracture toughness data has been generated that has been used to analyse the brittle failure model in the European pressure vessel code EN 13445. The evaluation of the results has been made successfully by the master curve analysis, previously applied to ferritic steels. The master curve analysis includes calculation of a reference temperature, which can be correlated to an impact toughness transition temperature. A correlation between fracture and impact toughness results is necessary for a practically applicable design code. The heat distribution and austenite reformation have been modelled to verify satisfactory toughness properties in the heat affected zone. A similar model was used to evaluate the nucleation and diffusional growth of sigma phase during isothermal heat treatment or continuous cooling.

For future stainless steel development, the availability of satisfactory correlations between composition, microstructure and mechanical properties are essential to optimize alloy design. Stainless steel data has been analysed to find approximate relations between mechanical properties and the chemical composition, grain size, ferrite content, product thickness and solution hardening size misfit parameter. The solution hardening effect was successfully predicted by the Labusch-Nabarro relation and multiple regression analyses were used to evaluate hardening equations for stainless steel.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 46 p.
Keyword
duplex stainless steel, fracture toughness, austenite reformation, sigma phase, material optimisation
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-3964 (URN)91-7178-354-7 (ISBN)
Public defence
2006-05-24, F3, Lindstedtsv. 26, KTH, 13:30
Opponent
Supervisors
Note
QC 20100920Available from: 2006-05-15 Created: 2006-05-15 Last updated: 2010-09-20Bibliographically approved

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