The influence of hot forging on the size and frequency of carbides in HS 6-5-2

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dc.contributor.authorPrůcha, Vojtěch
dc.contributor.authorBenešová, Soňa
dc.contributor.authorVeselý, Vilém
dc.contributor.authorKesl, Miloslav
dc.contributor.editorKučerová, Ludmila
dc.contributor.editorJirková, Hana
dc.contributor.editorJeníček, Štěpán
dc.date.accessioned2019-10-08T11:51:41Z
dc.date.available2019-10-08T11:51:41Z
dc.date.issued2019
dc.description.abstract-translatedThis paper follows on from a paper entitled “Effects of hot forging on the shape and size of prior austenite grain in HS 6-5-2 high-speed steel” which was devoted to a microstructure analysis of slugs from rolled bars of a high-speed steel after two and three forging cycles, each cycle comprising one upsetting and one drawing out operation, and explored the shape and size of prior austenite grains. This paper therefore explores the volume fraction and density of carbides of different sizes in relation to locations within a forged workpiece. The first location was the centre of a specimen with the largest strain εef = 8.1 (after two forging cycles) and εef = 9.9 (after three forging cycles). Another location was at the periphery of the specimen, with a strain of εef = 1.6 after two forging cycles and εef = 3.2 after three cycles. Micrographs of carbide particles were taken using a scanning electron microscope and examined with NIS Elements image analysis software. The majority of carbides were sized between 0.2 and 2 μm. Larger particles were rare. The carbides which are less than 1 μm in size do not shrink in response to increasing strain and their quantity does not change appreciably. Carbides with a size of 1-2 μm show a different behaviour. In the central region of specimens, where strain is the largest, their amounts are much larger than in less-worked regions. The percentage of carbides in the matrix is larger in the heavily-worked region. The 1-2 μm carbides are probably products of carbide dissolution during forging and subsequent reprecipitation from austenite. Earlier investigations (reported in the above-mentioned paper) revealed that with increasing strain austenite grains become finer and less circular, and therefore the aggregate grain boundary area expands. Precipitation of carbides, which reduces the surface energy of grain boundaries, is thus favourable in terms of energy.en
dc.description.sponsorshipPING 2019 is organized with the support of funds for specific university research project SVK1-2019-002.en
dc.format1 s.cs
dc.format.mimetypeapplication/PDF
dc.identifier.citationJIRKOVÁ, Hana ed.; JENÍČEK, Štepán ed. Proceedings PING 2019: modern trends in material engineering: 10.-13.09.2019, Pilsen. 1. vyd. Plzeň: University of West Bohemia, 2019, s. 56. ISBN 978-80-261-0879-5.en
dc.identifier.isbn978-80-261-0879-5
dc.identifier.urihttp://hdl.handle.net/11025/35237
dc.language.isoenen
dc.publisherUniversity of West Bohemiaen
dc.rights© University of West Bohemiaen
dc.rights.accessopenAccessen
dc.subjectHS 6-5-2cs
dc.subjectkovánícs
dc.subjectvelikost karbidůcs
dc.subjectefektivní napětícs
dc.subject.translatedHS 6-5-2en
dc.subject.translatedforgingen
dc.subject.translatedsize of carbidesen
dc.subject.translatedeffective strainen
dc.titleThe influence of hot forging on the size and frequency of carbides in HS 6-5-2en
dc.typekonferenční příspěvekcs
dc.typeconferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen

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