A strain rate sensitive constitutive model for quenched boron steel with tailored properties

Bardelcik, Alexander; Worswick, Michael J.; Winkler, S.; Wells, Mary A.

doi:10.1016/j.ijimpeng.2012.06.007

Cited by 113 publications

(49 citation statements)

References 20 publications

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“…[6,7,8,9]. An alternative route is to estimate effective material properties based on the properties of the constituent phases and arrangement at the microscale.…”

Section: Introductionmentioning

confidence: 99%

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Golling

Östlund

Oldenburg

2016

Materials Science and Engineering: A

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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 fullfield 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.

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“…[6,7,8,9]. An alternative route is to estimate effective material properties based on the properties of the constituent phases and arrangement at the microscale.…”

Section: Introductionmentioning

confidence: 99%

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Golling

Östlund

Oldenburg

2016

Materials Science and Engineering: A

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“…Maikranz-Valentin et al (2008) have proposed a new type of thermo-mechanical tailored processing based on the application of differential heating and cooling strategies. Bardelcik et al (2012) have examined the strength and strain-rate sensitivity of Usibor® 1500P subjected to various cooling rates ranging from 14 K/s to 50 K/s. Labudde and Bleck (2009) have post tempered the hot-formed workpiece, significantly reducing the hardness of the material from 550 HV to 290 HV.…”

Section: Introductionmentioning

confidence: 99%

Deformation behaviour of high strength steel sheet 22MnB5 at elevated temperature and its FE simulation model verification

Tang

Zheng

Huang

2017

IJMPT

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Abstract:The hot ductility and fracture behaviour of boron steel 22MnB5 is of significant importance in the development of new components based on the hot stamping process. It is well known that the strain rate and temperature have remarkable influence on the ductility and fracture behaviour of boron steel 22MnB5. In the paper, the uniaxial tensile tests were carried out at elevated temperatures, in a range between 550°C and 850°C, at different strain rates, to investigate the hot ductility of boron steel at high temperature. In order to discover the fracture mechanisms under hot tensile testing, fracture surface observations were performed by scanning electron microscope (SEM). Finite element (FE) model of the experiments was developed and successfully validated against the experimental results. The predicted force-displacement curves indicate the proposed FE model is able to predict the ductile fracture onset in hot stamping.Keywords: hot stamping; boron steel; hot ductility; fracture behaviour.Reference to this paper should be made as follows: Tang, B., Zheng, W. and Huang, L. (2017) 'Deformation behaviour of high strength steel sheet 22MnB5 at elevated temperature and its FE simulation model verification', Int.

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“…Stresses in the described model are calculated using an iso-strain assumption in a linear mixture rule where the amount of present phases is defined by a Vickers hardness value. An alternative approach is presented by Bardelcik et al (2012), here the parameters of the Voce are defined in dependence of Vickers hardness. By varying the hardness value in the model, intermediate grades can be represented.…”

Section: Introductionmentioning

confidence: 99%

A study on homogenization methods for steels with varying content of ferrite, bainite and martensite

Golling

Östlund

Oldenburg

2016

Journal of Materials Processing Technology

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The demand of ultra high strength steel (UHSS) components increased in the last decade due to their high strength to weight ratio. The driving force in this development is the automotive industry and regulations concerning passenger safety and fuel consumption. The use of ultra high strength steel enables design of lighter car bodies with equal or better passenger safety compared to earlier car generations. The automotive industry and their suppliers need predictive tools in the development of components with tailored material properties. Components with tailored material properties are produced by hot stamping, in this process a blank is austenitized before it is formed and quenched in one step. By use of sequential heated or cooled tools, different mechanical properties distributed within the same component are achieved.In order to develop a constitutive model for components consisting of regions with varying phase content, a suitable method to describe the elasto-plastic part of the yield curve is needed. The focus of this work is on the description of the elasto-plastic constitutive model of an ultra high strength steel depending on the phase content in the material. Different volume fractions of ferrite, bainite and martensite are experimentally formed. In this study the capability of different homogenization methods on the prediction of the material response of a multiphase steel depending on the volume fraction of formed phases is investigated. The modeling results are compared to experimental results.The prediction of the composite response using the micromechanical based double-inclusion model and pure phase measured data as well as experimentally obtained phase volume fractions of present phases showed good agreement throughout all samples tested in this study.

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A strain rate sensitive constitutive model for quenched boron steel with tailored properties

Cited by 113 publications

References 20 publications

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Deformation behaviour of high strength steel sheet 22MnB5 at elevated temperature and its FE simulation model verification

A study on homogenization methods for steels with varying content of ferrite, bainite and martensite

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