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IMPACT-TOUGHNESS INVESTIGATIONS OF DUPLEX STAINLESS STEELS

Abstract

Duplex stainless steels are very attractive constructional materials for use in aggressive environments because of their several advantages over austenitic stainless steels. Duplex steels have excellent pitting and crevice corrosion resistance, are highly resistant to chloride stress-corrosion cracking and are about twice as strong as common austenitic steels. Better properties are associated with their microstructures consisting of ferrite and austenite grains. However, with certain thermal treatments, these excellent properties may be reduced due to undesired changes in the steel microstructure, related mainly to different solid-state-precipitation processes. The impact toughness of the commercial 2205 duplex stainless steel and the higher-alloy super-duplex 2507 steel was investigated. Both steels were submitted to the ageing treatment in a temperature range between 500 °C and 900 °C with the exposure times of 6 min , 1 h and 10 h; in addition, light microscope examinations, hardness measurements and impact-toughness tests were performed. The main objective of the investigations was to determine the effect of the change in the microstructure on the mechanical properties of the steel.

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
Materiali in Tehnologije no. 49, pages 481 - 486,
ISSN: 1580-2949
Language:
English
Publication year:
2015
Bibliographic description:
Topolska S., Łabanowski J.: IMPACT-TOUGHNESS INVESTIGATIONS OF DUPLEX STAINLESS STEELS// Materiali in Tehnologije. -Vol. 49, nr. 4 (2015), s.481-486
Verified by:
Gdańsk University of Technology

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