Mechanical properties and corrosion resistance of dissimilar stainless steel welds

• Autorzy: Łabanowski J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The purpose of this paper is to determine the influence of welding on microstructure, mechanical properties, and stress corrosion cracking resistance of dissimilar stainless steels butt welded joints. Design/methodology/approach: Duplex 2205 and austenitic 316L steels were used. Butt joints of plates 15 mm in thickness were performed with the use of submerged arc welding (SAW) method. The heat input was in the range of 1.15 – 3.2 kJ/mm. Various plates' edge preparations were applied. Microstructure examinations were carried out. Mechanical properties were evaluated in tensile tests, bending tests and Charpy-V toughness tests. Susceptibility to stress corrosion cracking was determined with the use of slow strain rate tests (SSRT) performed in inert (glycerin) and aggressive (boiling 35% MgCl2 solution) environments. Findings: All tested joints showed acceptable mechanical properties. Metallographic examinations did not indicate the excessive ferrite contents in heat affected zones (HAZ) of the welds. It was shown that area of the lowest resistance to stress corrosion cracking is heat affected zone at duplex steel side of dissimilar joins. That phenomenon is connected with undesirable structure of that zone consisted of greater amounts of coarse ferrite grains and acicular austenite precipitates. High heat inputs do not deteriorate mechanical properties as well as stress corrosion cracking resistance of welds. Practical implications: All tested joints showed acceptable mechanical properties. Metallographic examinations did not indicate the excessive ferrite contents in heat affected zones (HAZ) of the welds. It was shown that area of the lowest resistance to stress corrosion cracking is heat affected zone at duplex steel side of dissimilar joins. That phenomenon is connected with undesirable structure of that zone consisted of greater amounts of coarse ferrite grains and acicular austenite precipitates. High heat inputs do not deteriorate mechanical properties as well as stress corrosion cracking resistance of welds. Originality/value: Mechanical properties and stress corrosion cracking resistance of dissimilar stainless steel welded joints was determined. The zone of the weaker resistance to stress corrosion cracking was pointed out.

Słowa kluczowe

EN

crack resistance; welded joints; corrosion; duplex stainless steel

PL

odporność na pękanie; połączenie spawane; korozja; stal duplex

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2007
• Tom: Vol. 28, nr 1
• Strony: 27--33
• Opis fizyczny: Bibliogr. 20 poz., il., wykr.

Twórcy

autor

Łabanowski J.

• Department of Materials Science and Engineering, Faculty of Mechanical Engineering, Gdansk University of Technology, Narutowicza 11/12 Str., 80-952 Gdansk, Poland,

Bibliografia

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