Plasma keyhole welding of uns s32760 super duplex stainless steel: Microstructure and mechanical properties

Migiakis, K; Daniolos, N; Papadimitriou, GD

dc.contributor.author	Migiakis, K	en
dc.contributor.author	Daniolos, N	en
dc.contributor.author	Papadimitriou, GD	en
dc.date.accessioned	2014-03-01T01:34:18Z
dc.date.available	2014-03-01T01:34:18Z
dc.date.issued	2010	en
dc.identifier.issn	1042-6914	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20684
dc.subject	Fracture	en
dc.subject	Impact toughness	en
dc.subject	Mechanical properties	en
dc.subject	Microstructure	en
dc.subject	Nitrogen addition	en
dc.subject	Plasma keyhole	en
dc.subject	Super duplex stainless steel	en
dc.subject	Tensile strength	en
dc.subject	Welding	en
dc.subject	Zeron 100	en
dc.subject.classification	Engineering, Manufacturing	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Ductile to brittle transitions	en
dc.subject.other	Duplex stainless steel	en
dc.subject.other	Fusion zones	en
dc.subject.other	Impact toughness	en
dc.subject.other	Keyhole welding	en
dc.subject.other	Microstructure and mechanical properties	en
dc.subject.other	Nitrogen addition	en
dc.subject.other	Nitrogen additions	en
dc.subject.other	Plasma gas	en
dc.subject.other	Protective gas	en
dc.subject.other	Shielding gas	en
dc.subject.other	Standard requirements	en
dc.subject.other	Super duplex stainless steel	en
dc.subject.other	Temperature range	en
dc.subject.other	Transition temperature	en
dc.subject.other	Weldments	en
dc.subject.other	Argon	en
dc.subject.other	Corrosion resistant alloys	en
dc.subject.other	Ferrite	en
dc.subject.other	Fracture	en
dc.subject.other	Fracture toughness	en
dc.subject.other	Hardness	en
dc.subject.other	Impact strength	en
dc.subject.other	Mechanical properties	en
dc.subject.other	Microstructure	en
dc.subject.other	Nitrogen	en
dc.subject.other	Nitrogen plasma	en
dc.subject.other	Tensile strength	en
dc.subject.other	Welding	en
dc.subject.other	Stainless steel	en
dc.title	Plasma keyhole welding of uns s32760 super duplex stainless steel: Microstructure and mechanical properties	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/10426910903179955	en
heal.identifier.secondary	http://dx.doi.org/10.1080/10426910903179955	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	The present investigation concerns plasma-keyhole welding of UNS S32760 super-duplex stainless steel. Apart from Argon, a mixture of argon with 2 vol% nitrogen was used in both plasma and shielding gas, in order to improve the austenite/ferrite balance. Keyhole welding with argon provides with a narrow fusion zone with a satisfactory microstructure, which is further improved by the addition of nitrogen in the plasma and protective gas. The mechanical properties, in terms of hardness and impact strength, have been studied and compared for both operating gases used. It has been shown that better mechanical properties of the weldments are obtained when using an argon-2vol% nitrogen mixture. All welded specimens exhibit satisfactory impact toughness with regard to standard requirements. Ductile to brittle transition takes place in the temperature range from -40°C to -65°C. Nitrogen addition to the plasma gas affects positively the impact toughness of the weldments above the transition temperature, but below this temperature the effect of nitrogen becomes negative. This is interpreted in terms of the austenite-to-ferrite ratio and of the possibility of ferrite to deform by twinning even in the subcritical temperature range. © Taylor & Francis Group, LLC.	en
heal.publisher	TAYLOR & FRANCIS INC	en
heal.journalName	Materials and Manufacturing Processes	en
dc.identifier.doi	10.1080/10426910903179955	en
dc.identifier.isi	ISI:000280678300011	en
dc.identifier.volume	25	en
dc.identifier.issue	7	en
dc.identifier.spage	598	en
dc.identifier.epage	605	en