Influence of ferrite-martensite microstructural morphology on tensile properties of dual-phase steel

Sarwar, Muhammad; Priestner, R.

doi:10.1007/bf00356631

Cited by 205 publications

(93 citation statements)

References 7 publications

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“…The microstructure of DP steels generally consists of a ferrite matrix with embedded martensite islands. The volume fraction and the size of the phases largely determine the tensile strength and formability [1][2][3]. The multiphase microstructure of DP steels results in a complex micromechanical behaviour.…”

Section: Introductionmentioning

confidence: 99%

Failure mechanisms in DP600 steel: Initiation, evolution and fracture

Ghadbeigi¹,

Pinna²,

Celotto³

2013

Materials Science and Engineering: A

115

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Section: Introductionmentioning

confidence: 99%

Failure mechanisms in DP600 steel: Initiation, evolution and fracture

Ghadbeigi¹,

Pinna²,

Celotto³

2013

Materials Science and Engineering: A

115

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“…Upon rapid cooling, the austenite transforms into martensite. These so produced UFG ferrite/martensite dual-phase (DP) steels are of special interest for industrial applications, as conventional coarse and fine grained DP steels have been studied for more than three decades [9][10][11][12][13][14][15][16][17][18][19] and make up a considerable portion of today's car bodies. 20) It has been repeatedly demonstrated that increasing the strength of DP steels by grain refinement is not counteracted by a significant loss of tensile ductility.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Control during Fabrication of Ultrafine Grained Dual-phase Steel: Characterization and Effect of Intercritical Annealing Parameters

2012

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An ultrafine grained (UFG) ferrite/cementite steel was subjected to intercritical annealing in order to obtain an UFG ferrite/martensite dual-phase (DP) steel. The intercritical annealing parameters, namely, holding temperature and time, heating rate, and cooling rate were varied independently by applying dilatometer experiments. Microstructure characterization was performed using scanning electron microscopy (SEM) and high-resolution electron backscatter diffraction (EBSD). An EBSD data post-processing routine is proposed that allows precise distinction between the ferrite and the martensite phase. The sensitivity of the microstructure to the different annealing conditions is identified. As in conventional DP steels, the martensite fraction and the ferrite grain size increase with intercritical annealing time and temperature. Furthermore, the variations of the microstructure are explained in terms of the changes in phase transformation kinetics due to grain refinement and the manganese enrichment in cementite during warm deformation.

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“…[1,2] Their combination of high strength and increased uniform and total elongation, even compared to dual-phase (DP) steels, enables the forming of complex-shaped components where stretchability is a key formability characteristic. Additionally, this combination of properties can enhance the energy absorption capacity, giving better crashworthiness and thus, improved passenger safety.…”

Section: Introductionmentioning

confidence: 99%

Deformation-Induced Microstructural Banding in TRIP Steels

Celotto

Ghadbeigi

Pinna

et al. 2018

Metall Mater Trans A

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Microstructure inhomogeneities can strongly influence the mechanical properties of advanced high-strength steels in a detrimental manner. This study of a transformation-induced plasticity (TRIP) steel investigates the effect of pre-existing contiguous grain boundary networks (CGBNs) of hard second-phases and shows how these develop into bands during tensile testing using in situ observations in conjunction with digital image correlation (DIC). The bands form by the lateral contraction of the soft ferrite matrix, which rotates and displaces the CGBNs of second-phases and the individual features within them to become aligned with the loading direction. The more extensive pre-existing CGBNs that were before the deformation already aligned with the loading direction are the most critical microstructural feature for damage initiation and propagation. They induce micro-void formation between the hard second-phases along them, which coalesce and develop into long macroscopic fissures. The hard phases, retained austenite and martensite, were not differentiated as it was found that the individual phases do not play a role in the formation of these bands. It is suggested that minimizing the presence of CGBNs of hard second-phases in the initial microstructure will increase the formability.

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Influence of ferrite-martensite microstructural morphology on tensile properties of dual-phase steel

Cited by 205 publications

References 7 publications

Failure mechanisms in DP600 steel: Initiation, evolution and fracture

Failure mechanisms in DP600 steel: Initiation, evolution and fracture

Microstructure Control during Fabrication of Ultrafine Grained Dual-phase Steel: Characterization and Effect of Intercritical Annealing Parameters

Deformation-Induced Microstructural Banding in TRIP Steels

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