Influence of Volume Fraction and Distribution of Martensite Phase on the Strain Localization in Dual Phase Steels

Saai, Afaf; Hopperstad, Odd Sture; Granbom, Ylva; Lademo, Odd-Geir

doi:10.1016/j.mspro.2014.06.146

Cited by 33 publications

(23 citation statements)

References 7 publications

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“…1: intra-phase fracture; void nucleation caused by microcracking within grains or interface decohesion between adjacent grains of the same phase, and 2: interphase fracture; void nucleation caused by interface decohesion between adjacent grains of different phases. A line of thought supported by [44,45,46] who identified decohesion of the ferrite-martensite interface as one mechanism of void nucleation and that those voids grow along ferrite grain boundaries.…”

Section: Ductile Fracturementioning

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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Section: Ductile Fracturementioning

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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“…A distinct increase of temperature in the gauge section of the tested specimens may also justify the considerable high value of the local deformation of the samples stretched atε 1 . This may be caused by the fact, that the largest local deformations in DP steels are being observed in ferrite, particularly in the zones of ferrite-martensite interfaces [12,13], which are the fracture initiation zones [12,14]. In the course of stretching with the rateε 1 , the temperature rise of the tested sample can intensify the diffusion of carbon to dislocations and phase boundaries, causing the effect of dynamic ageing [11].…”

Section: Discussionmentioning

confidence: 99%

“…This may be possibly due to only a slight difference in the mechanical properties, connected with the increased deformation rate. However, in DP steels containing high amounts of martensite, this phase is also subjected to deformation, even in a degree comparable to that of ferrite [14,15] and thus also to fracture [16].…”

Section: Discussionmentioning

confidence: 99%

Thermographic analysis of dual-phase steel under quasi-static and dynamic tension

Kołodziej¹,

Weber²,

Czulak³

et al. 2020

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The work presents a study on temperature changes during tensile tests of high-strength dual-phase steel, performed with different strain rates,ε1 = 3.3 × 10 −3 s −1 andε2 = 33 s −1 , at room temperature, making use of a high-resolution thermographic camera. It has been shown that with increasing strain rate the ultimate tensile strength grows, from ca. 1305 to ca. 1326 MPa, whereby the average strain values decrease from ca. 7.9 to ca. 7.2 %. The temperature of the specimens stretched with the lower strain rate grows during the tensile test by about 32 • C, whereas, in the case of the specimens stretched with a higher strain rate, by about 98 • C. Moreover, the precise analysis of the temperature profiles, registered with the thermographic camera, indicated a significant temperature drop preceding the rupture of specimens by about 5 % of the maximum temperature value. K e y w o r d s : thermographic measurements, infrared camera, tensile test, high-speed deformation, dual-phase steels

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“…Saai et al 14) proposed that the volume fraction and distribution of martensite in the soft ferrite phase is responsible for strain localization and fracture in DP steels. While the strengthening effect of hard phases, such as martensite in DP steels 15) and δ-ferrite in duplex stainless steels, 16) are extensively investigated, there are few studies on the interactions between α-ferrite and austenite during hot deformation, where α-ferrite is the softer phase and austenite is the harder.…”

Section: Correlation Of Strain Accommodation Factor With the State Ofmentioning

confidence: 99%

Correlation of Strain Accommodation Factor with the State of Microstructural Components in a Multiphase Steel

2015

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Influence of Volume Fraction and Distribution of Martensite Phase on the Strain Localization in Dual Phase Steels

Cited by 33 publications

References 7 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

Thermographic analysis of dual-phase steel under quasi-static and dynamic tension

Correlation of Strain Accommodation Factor with the State of Microstructural Components in a Multiphase Steel

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