EFFECT OF M7C3-]M23C6 TRANSFORMATION ON FRACTURE-BEHAVIOR 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	2014-03-01T01:42:05Z
dc.date.available	2014-03-01T01:42:05Z
dc.date.issued	1993	en
dc.identifier.issn	0267-0836	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23699
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.other	GRAIN-BOUNDARY CARBIDES	en
dc.subject.other	IMPACT PROPERTIES	en
dc.subject.other	EMBRITTLEMENT	en
dc.subject.other	CREEP	en
dc.title	EFFECT OF M7C3-]M23C6 TRANSFORMATION ON FRACTURE-BEHAVIOR OF CAST FERRITIC STAINLESS-STEELS	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1993	en
heal.abstract	The fracture 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-degrees-C for different times up to 2210 h. The fracture 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 M23C6 carbides. The M23C6 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 M23C6 transformation during the heat treatments, enhancing the interdendritic mode of fracture both in the as cast and in the annealed condition.	en
heal.publisher	INST MATERIALS	en
heal.journalName	MATERIALS SCIENCE AND TECHNOLOGY	en
dc.identifier.isi	ISI:A1993MK65300013	en
dc.identifier.volume	9	en
dc.identifier.issue	8	en
dc.identifier.spage	711	en
dc.identifier.epage	717	en