Microstructures and mechanical properties after heating of reinforcing 500 MPa class weldable steels produced by various processes (Tempcore, microalloyed with vanadium and work-hardened)

Nikolaou, J; Papadimitriou, GD

dc.contributor.author	Nikolaou, J	en
dc.contributor.author	Papadimitriou, GD	en
dc.date.accessioned	2014-03-01T01:21:03Z
dc.date.available	2014-03-01T01:21:03Z
dc.date.issued	2004	en
dc.identifier.issn	0950-0618	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16048
dc.subject	Fire	en
dc.subject	Mechanical properties	en
dc.subject	Microstructure	en
dc.subject	Reinforcing steel	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Alloying	en
dc.subject.other	Fracture toughness	en
dc.subject.other	Hardness	en
dc.subject.other	Heating	en
dc.subject.other	Loads (forces)	en
dc.subject.other	Microstructure	en
dc.subject.other	Plastic deformation	en
dc.subject.other	Reinforcement	en
dc.subject.other	Tempering	en
dc.subject.other	Weldability	en
dc.subject.other	Fire	en
dc.subject.other	Reinforcing steels	en
dc.subject.other	Steel	en
dc.title	Microstructures and mechanical properties after heating of reinforcing 500 MPa class weldable steels produced by various processes (Tempcore, microalloyed with vanadium and work-hardened)	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.conbuildmat.2004.01.001	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.conbuildmat.2004.01.001	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	The load bearing capacity of reinforced concrete structures after fire can be assessed if the modified mechanical properties of the building materials, designated here as 'residual', are known. In this respect, the residual properties of reinforcing steels produced (a) by the Tempcore process; (b) microalloying with vanadium; and (c) work-hardening, all falling into grade FeB500S, were selected for investigation, aiming to represent a wide range of steels currently available for the construction industry in Europe. For both the microalloyed with vanadium and for the work-hardened reinforcing steels typical diameters were investigated. For the Tempcore-type reinforcing steels, due to their heterogeneous structure, the effect of size and composition have been also examined. Specimens of the above types of steel were heated at temperatures ranging from 200 degreesC to 800 degreesC for 1 h and then cooled in air to room temperature. Thereafter, their residual properties were assessed by hardness measurements, tensile and Charpy-V impact tests. Metallographic analysis was used to correlate mechanical properties to microstructural characteristics. From the above investigation it was concluded that the Tempcore steels presented the more stable behavior up to temperatures of 500 degreesC, while the microalloyed steel, although it presented very satisfactory tensile properties, displayed low impact toughness due to coarsening of vanadium carbides. The work-hardened steel showed a continuous drop of its properties from approximately 250 degreesC and suffered from brittleness in the vicinity of 200 degreesC due to strain aging phenomena. (C) 2004 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Construction and Building Materials	en
dc.identifier.doi	10.1016/j.conbuildmat.2004.01.001	en
dc.identifier.isi	ISI:000221364400002	en
dc.identifier.volume	18	en
dc.identifier.issue	4	en
dc.identifier.spage	243	en
dc.identifier.epage	254	en