Plasma transferred arc boriding of a low carbon steel: Microstructure and wear properties

Bourithis, L; Papaefthymiou, S; Papadimitriou, GD

dc.contributor.author	Bourithis, L	en
dc.contributor.author	Papaefthymiou, S	en
dc.contributor.author	Papadimitriou, GD	en
dc.date.accessioned	2014-03-01T01:18:13Z
dc.date.available	2014-03-01T01:18:13Z
dc.date.issued	2002	en
dc.identifier.issn	0169-4332	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14869
dc.subject	Alloying	en
dc.subject	Boriding	en
dc.subject	PTA	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.subject.classification	Physics, Applied	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	Boriding	en
dc.subject.other	Carbon steel	en
dc.subject.other	Crack initiation	en
dc.subject.other	Crystal microstructure	en
dc.subject.other	Eutectics	en
dc.subject.other	Granular materials	en
dc.subject.other	Hardness	en
dc.subject.other	Phase transitions	en
dc.subject.other	Plasma applications	en
dc.subject.other	Plastic deformation	en
dc.subject.other	Protective coatings	en
dc.subject.other	Tribology	en
dc.subject.other	Wear of materials	en
dc.subject.other	Borided coatings	en
dc.subject.other	Plasma transferred arc (PTA) melting	en
dc.subject.other	Surface treatment	en
dc.title	Plasma transferred arc boriding of a low carbon steel: Microstructure and wear properties	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0169-4332(02)00901-7	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0169-4332(02)00901-7	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	Borided coatings on AISI 1018 steel with different boron contents were produced using plasma transferred arc (PTA) melting. The thickness of the coatings ranged from 1 to 1.5 mm and their hardness from 400 to 1600 HV. Hypoeutectic or hypereutectic compositions consisting of primary ferrite or primary Fe2B borides, respectively, and a eutectic constituent of alpha-Fe + Fe2B were obtained. The presence of FeB attested in coatings with the highest boron contents seems to be responsible for the intergranular cracks extending from the surface of the coatings to the substrate. Crack free coatings corresponding to the minimum quantity of eutectic and with a minor quantity of FeB were subjected to pin on disk wear testing and compared to the steel of the substrate. It was found that the wear rate of the borided coatings was about four orders of magnitude lower than the wear rate of the steel substrate. A transition from mild to severe wear was observed for the steel substrate material, but it was absent in the case of the borided coatings for the entire range of the applied loads examined. It is shown that the transition in the case of steel occurs when grooving and plastic deformation is replaced by intense cracking of the material above a critical load. In the case of the borided layer the dominant wear mechanism is delamination of the eutectic, however, the platelike borides are able to support the load and remain in the mild wear range for all the loads tested. Both borided and plain steel surfaces have the same friction coefficient after a short transition period, because both develop an oxide layer leading roughly to the same tribosystem with the alumina counterbody. (C) 2002 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Applied Surface Science	en
dc.identifier.doi	10.1016/S0169-4332(02)00901-7	en
dc.identifier.isi	ISI:000178896900023	en
dc.identifier.volume	200	en
dc.identifier.issue	1-4	en
dc.identifier.spage	203	en
dc.identifier.epage	218	en