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Fracture resistance of tailor tempered microstructures obtained by different press hardening conditions
Fundació CTM Centre Tecnològic / Universitat Politècnica de Catalunya, Universitat Politècnica de Catalunya, Fundació CTM Centre Tecnològic, Avda.
Fundació CTM Centre Tecnològic.
Fundació CTM Centre Tecnològic.
Fundació CTM Centre Tecnològic.
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2015 (English)In: Hot Sheet Metal Forming of High-Performance Steel 5th International Conference: May 31-June 3, Toronto, Canada : Proceedings / [ed] Kurt Steinhoff; Mats Oldenburg; Braham Prakash, Auerbach: Verlag Wissenschaftliche Scripten , 2015, p. 221-229Conference paper, Published paper (Refereed)
Abstract [en]

Tailored tempering can produce different amounts of martensite, upper and lower bainite and ferrite depending on the press hardening conditions are usually obtained. The tensile properties of such microstructures are quite well known, but the intrinsic fracture properties, as fracture toughness, have not yet been characterized. This is mainly related the experimental difficulty to measure fracture toughness in thin sheets. Recently, the authors have proposed to measure it through the application of the Essential Work of Fracture methodology. The knowledge of facture toughness would give valuable information to increase their applicability in automotive components and would also allow a further understanding of fracture and crack propagation mechanisms in B steel hardened at different cooling conditions. Thus the aim of this paper is to determine the fracture toughness in microstructures of a 22MnB5 steels obtained by tailored tempering. Results indicate that the EWF methodology can be applied to measure fracture toughness and the energy for crack initiation in ferrite-pearlite and ferrite-bainite microstructures. Fracture initiation energy is the same in ferrite-pearlite and ferrite-bainite microstructures, which will indicate that ferrite has a clear effect on fracture initiation. Moreover, fractography results reveal the effect of inclusion content on fracture energies

Place, publisher, year, edition, pages
Auerbach: Verlag Wissenschaftliche Scripten , 2015. p. 221-229
Series
CHS2-Series ; 5
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-38336Local ID: cb24213a-2f5b-44b4-9d54-937ee76574e7ISBN: 9783957350237 (print)OAI: oai:DiVA.org:ltu-38336DiVA, id: diva2:1011836
Conference
International Conference on Hot Sheet Metal Forming of High-Performance Steel : 31/05/2015 - 03/06/2015
Note
Validerad; 2016; Nivå 1; 20151113 (stegol)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved

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Golling, StefanOldenburg, Mats

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