The dependence of some tensile and fatigue properties of a dual-phase steel on its microstructure

Cai, Xueling; Feng, Jian; Owen, W. S.

doi:10.1007/bf02658673

Cited by 71 publications

(23 citation statements)

References 12 publications

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“…To this end, a vast variety of microstructure variations can be introduced in DP steels by small changes in the composition and/or thermomechanical processing [18,[35][36][37][38][39][40][41][42]. To guide this microstructure design process, micromechanicsbased foundations and design guidelines are needed that would ensure damage-prone microstructures.…”

Section: Introductionmentioning

confidence: 99%

Retardation of plastic instability via damage-enabled microstrain delocalization

et al. 2015

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Multi-phase microstructures with high mechanical contrast phases are prone to microscopic damage mechanisms. For ferrite-martensite dual-phase steel, for example, damage mechanisms such as martensite cracking or martensite-ferrite decohesion are activated with deformation, and discussed often in literature in relation to their detrimental role in triggering early failure in specific dualphase steel grades. However, both the micromechanical processes involved and their direct influence on the macroscopic behavior are quite complex, and a deeper understanding thereof requires systematic analyses. To this end, an experimental-theoretical approach is employed here, focusing on three model dual-phase steel microstructures each deformed in three different strain paths. The micromechanical role of the observed damage mechanisms is investigated in detail by in-situ scanning electron microscopy tests, quantitative damage analyses, and finite element simulations. The comparative analysis reveals the unforeseen conclusion that damage nucleation may have a beneficial mechanical effect in ideally designed dual-phase steel microstructures (with effective crack-arrest mechanisms) through microscopic strain delocalization.

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Section: Introductionmentioning

confidence: 99%

Retardation of plastic instability via damage-enabled microstrain delocalization

et al. 2015

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“…The good mechanical properties [1,7,8] combined with low costs make DP steels attractive as structural design materials. A number of works have addressed the optimization of the thermomechanical heat treatment [3,[9][10][11] and the resulting microstructures [7,[12][13][14] and properties [12,[15][16][17][18] of these steels. For instance, Calcagnotto et al used different heat treatments to lower the grain size of ferrite, since this improves the toughness of the DP-steel and the capability to absorb impact energy [13].…”

Section: Introductionmentioning

confidence: 99%

Alloying effects on microstructure formation of dual phase steels

et al. 2015

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“…[3] This study, like others, shows that these bands have an important effect on mechanical properties. [4][5][6] There have been previous studies to investigate and control the formation of microstructural bands during processing. [7,8] It has been reported that the thermomechanical processing required to avoid the formation of microstructural bands can be sometimes economically impractical [7] or physically impossible due to the thermodynamics and kinetics governing the formation of such bands.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of such bands on local deformation and damage has been reported to be both detrimental and beneficial. [4,5,[10][11][12][13] A comparative study of two TRIP steels concluded that microstructure banding was in fact beneficial in that it resulted in ductile fracture, although it did not improve the tensile elongation. [6] A direct comparison, however, is not straightforward as several parameters differ between the respective materials investigated, such as grain size and distribution, phase content, and inclusion morphology.…”

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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The dependence of some tensile and fatigue properties of a dual-phase steel on its microstructure

Cited by 71 publications

References 12 publications

Retardation of plastic instability via damage-enabled microstrain delocalization

Retardation of plastic instability via damage-enabled microstrain delocalization

Alloying effects on microstructure formation of dual phase steels

Deformation-Induced Microstructural Banding in TRIP Steels

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