The effect of tempering on the toughness of hardened steel

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorPietikäinen, Juha
dc.contributor.schoolKemian ja materiaalitieteiden tiedekuntafi
dc.date.accessioned2012-08-23T05:24:02Z
dc.date.available2012-08-23T05:24:02Z
dc.date.issued1966
dc.description.abstractThe effect of tempering upon the toughness of hardened steel has been investigated. A steel having the nominal analysis: 0.35 % C, 1.5 % Si, 20 % Ni was chosen for this work. The analysis was mainly chosen with the objectives in mind that the Ms temperature should be low enough to ensure that no tempering will occur on quenching, and that the carbides produced on tempering might precipitate each within its own particular tempering temperature range. Test bars made of the investigated steel were austenitized and quenched in liquid nitrogen, with subsequent isothermal tempering at various temperatures in the range Tt = -110 to 450 °C. The structures of the heat-treated specimens were examined by x-rays and by electron microscopy, using both the replica and thin foil technique. Changes occurring in the structures during the tempering process were followed with the aid of a dilatometer. The principal part of the work consists of mechanical tests, for which a torsion testing machine was designed and built. The machine was so designed that the true stress vs. true strain diagram could be readily obtained with its aid. The experimental conditions, including speed of rotation (n) and testing temperature (Tk), were variable within wide limits. In the mechanical tests performed, the speed of rotation was varied within the range of n = 0.00135 to 640 r.p.m. The testing temperatures were: Tk = -110, +25 and +95 °C. The deformed structures were also examined by electron microscopy.en
dc.format.extentVerkkokirja (4344 KB, 80 s.)
dc.format.mimetypeapplication/pdf
dc.identifier.isbn978-951-22-9960-7
dc.identifier.isbnpaperimuodossa. (printed)#8195;
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/4630
dc.identifier.urnURN:ISBN:978-951-22-9960-7
dc.language.isoenen
dc.publisherTeknillinen korkeakouluen
dc.relation.haspart[Errata file]: Errataen
dc.subject.keywordtempered steelen
dc.subject.keywordbrittlenessen
dc.subject.keywordtemperingen
dc.subject.keywordtesting methodsen
dc.subject.keywordmaterials testingen
dc.subject.keyworddeformationen
dc.subject.keywordstressesen
dc.subject.keywordmartensiteen
dc.subject.keywordtemperature dependenceen
dc.subject.keywordX-ray examinationsen
dc.subject.keyworddilatometeren
dc.subject.keywordelectron microscopyen
dc.titleThe effect of tempering on the toughness of hardened steelen
dc.typeG4 Monografiaväitöskirjafi
dc.type.dcmitypetexten
dc.type.ontasotVäitöskirja (monografia)fi
dc.type.ontasotDoctoral dissertation (monograph)en
local.aalto.digiauthask
local.aalto.digifolderAalto_67494
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