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Fatigue of 0.55C-1.72Si Steel with Tempered Martensitic and Carbide-Free Bainitic Microstructures
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-1454-1118
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2014 (English)In: Acta Metallurgica Sinica (English Letters), ISSN 1006-7191, E-ISSN 2194-1289, Vol. 27, no 1, p. 55-62Article in journal (Refereed) Published
Abstract [en]

High-Si spring steel was heat treated in three different ways: Quenching and tempering at 460 °C to obtain a tempered martensite microstructure, and austempering at 300 and 350 °C, respectively, to obtain two different carbide-free bainitic microstructures. In the steel austempered at 350 °C, both the bainite lath thickness and retained austenite content were higher than those of the steel austempered at 300 °C. Rotating-bending fatigue tests were done in order to evaluate the effect of each heat treatment on the high-cycle fatigue behavior of the steel. When the austempering temperature was 300 °C, the endurance limit was increased by 25% despite a 5% reduction in tensile strength when compared with that of the quenched and tempered steel. The relationship between endurance limit [Rfat (50%)] and ultimate tensile strength (Rm) was higher for the austempered samples in comparison with that of the quenched and tempered material. Therefore, it is believed that the presence of retained austenite affects the relationship between endurance limit and tensile strength.

Place, publisher, year, edition, pages
2014. Vol. 27, no 1, p. 55-62
National Category
Other Materials Engineering Applied Mechanics Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Engineering Materials; Solid Mechanics; Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-6071DOI: 10.1007/s40195-013-0020-4Local ID: 445075f9-f36e-499d-bf30-07af86c43d98OAI: oai:DiVA.org:ltu-6071DiVA: diva2:978948
Note
Validerad; 2014; 20140129 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-10Bibliographically approved

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Leiro, AlejandroSundin, Karl-GustafPrakash, BrahamVuorinen, Esa
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Other Materials EngineeringApplied MechanicsTribology (Interacting Surfaces including Friction, Lubrication and Wear)

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