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Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0002-5099-6462
Gestamp Hardtech AB, Luleå.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
Number of Authors: 3
2016 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 658, 472-483 p.Article in journal (Refereed) Published
Abstract [en]

Developments of the hot stamping technology have enabled the production of components with differential microstructure composition and mechanical properties. These can increase the performance of certain crash-relevant automotive structures by combining high intrusion protection and energy absorption. This paper presents a comprehensive experimental investigation on the flow and ductile fracture properties of boron-alloyed steel with a wide range of different microstructure compositions. Three types of dual phase microstructures at three different volume fractions, and one triple phase grade, were generated by thermal treatment. Flow curves extending beyond necking and the equivalent plastic strain to fracture for each grade was determined by tensile testing using full-field measurements. The influence of phase composition and microstructural parameters were further investigated by means of a multi-scale modeling approach based on mean-field homogenization in combination with local fracture criteria. Inter-phase and intra-phase fracture mechanisms were considered by adopting two separate fracture criteria formulated in terms of the local average stress field. The micromechanical model captures with useful accuracy the strong influence of microstructure and processing conditions on the flow and fracture properties, implying promising prospects of mean-field homogenization for the constitutive modeling of hot stamped components.

Place, publisher, year, edition, pages
2016. Vol. 658, 472-483 p.
National Category
Applied Mechanics
Research subject
Solid Mechanics
URN: urn:nbn:se:ltu:diva-7128DOI: 10.1016/j.msea.2016.01.091Local ID: 572262cb-f8b4-440d-92c5-304e9d3a8d0cOAI: diva2:980016

Validerad; 2016; Nivå 2; 20160208 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-01-19Bibliographically approved

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