Effect of M7C3 → M23C6 transformation on fracture behaviour of cast ferritic stainless steels

Vardavoulias, M; Papadimitriou, G; Pantelis, D

dc.contributor.author	Vardavoulias, M	en
dc.contributor.author	Papadimitriou, G	en
dc.contributor.author	Pantelis, D	en
dc.date.accessioned	2014-03-01T01:41:48Z
dc.date.available	2014-03-01T01:41:48Z
dc.date.issued	1993	en
dc.identifier.issn	02670836	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23649
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-13844252451&partnerID=40&md5=7e4aab2d3a54ca76bd045a5c71d16929	en
dc.subject.other	As-cast	en
dc.subject.other	Coarse particles	en
dc.subject.other	Eutectic mixture	en
dc.subject.other	Ferritic stainless steel	en
dc.subject.other	Fracture behaviour	en
dc.subject.other	Fracture mechanisms	en
dc.subject.other	M7C3 carbides	en
dc.subject.other	Mode of fracture	en
dc.subject.other	Transgranular	en
dc.subject.other	Carbides	en
dc.subject.other	Eutectics	en
dc.subject.other	Ferrite	en
dc.subject.other	Ferritic steel	en
dc.subject.other	Fracture	en
dc.subject.other	Morphology	en
dc.subject.other	Titanium	en
dc.subject.other	Zirconium	en
dc.subject.other	Steel castings	en
dc.title	Effect of M7C3 → M23C6 transformation on fracture behaviour of cast ferritic stainless steels	en
heal.type	journalArticle	en
heal.publicationDate	1993	en
heal.abstract	Thefracture behaviour of three 29 wt-%Cr ferritic steels, two containing zirconium and titanium respectively, has been investigated in the as cast condition and after annealing at 660°Cfor different times up to 2210 h. Thefracture energy and the mode of fracture depend on both the morphology and the nature of the eutectic, which consists of carbides and ferrite. In the as cast condition, fracture is predominantly transgranular cleavage and it can be associated with the discontinuous morphology of the M7C3 carbides present in the eutectic as coarse particles surrounded by the eutectic ferrite. After prolonged heating, the ambient fracture energy decreases and the interdendritic mode of fracture is enhanced. This change in fracture mechanism is associated with transformation of the M7C3 to M23 C6 carbides. The M23 C6 carbides, unlike the coarse M7C3 carbides, form a continuous network within the eutectic mixture and constitute an easy path for crack propagation. The zirconium and titanium additions result in a more massive morphology of the carbides in the eutectic mixture and accelerate the M7C3 to M23 C6 transformation during the heat treatments, enhancing the interdendritic mode offracture both in the as cast and in the annealed condition. © 1993 The Institute of Materials.	en
heal.journalName	Materials Science and Technology	en
dc.identifier.volume	9	en
dc.identifier.issue	8	en
dc.identifier.spage	711	en
dc.identifier.epage	717	en