Microstructural analysis of ductility and fracture in fine-grained and ultrafine-grained vanadium-added DP1300 steels

Samei, Javad; Zhou, Linfeng; Kang, Jidong; Wilkinson, David S.

doi:10.1016/j.ijplas.2017.12.009

Cited by 46 publications

(21 citation statements)

References 21 publications

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“…Over the last decades, the advanced high strength steels (AHSS) and ultra high strength steels (UHSS) [1][2][3][4] have taken over the automotive industry, as they impose the best solution for the ever-demanding need to produce better materials. Their success lies on the fact that they combine the effects of their chemical composition and thermal processing in order to achieve the desired strength/ductility ratio.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ultra-Fast Heating on the Microstructure, Grain Size and Texture Evolution of a Commercial Low-C, Medium-Mn DP Steel

Banis

Durán

Bliznuk

et al. 2019

Metals

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The effect of ultra-fast heating on the microstructures of steel has been thoroughly studied over the last year as it imposes a suitable alternative for the production of ultra high strength steel grades. Rapid reheating followed by quenching leads to fine-grained mixed microstructures. This way the desirable strength/ductility ratio can be achieved while the use of costly alloying elements is significantly reduced. The current work focuses on the effect of ultra-fast heating on commercial dual phase grades for use in the automotive industry. Here, a cold-rolled, low-carbon, medium-manganese steel was treated with a rapid heating rate of 780 °C/s to an intercritical peak temperature (760 °C), followed by subsequent quenching. For comparison, a conventionally heated sample was studied with a heating rate of 10 °C/s. The initial microstructure of both sets of samples consisted of ferrite, pearlite and martensite. It is found that the very short heating time impedes the dissolution of cementite and leads to an interface-controlled α → γ transformation. The undissolved cementite affects the grain size of the parent austenite grains and of the microstructural constituents after quenching. The final microstructure consists of ferrite and martensite in a 4/1 ratio, undissolved cementite and traces of austenite while the presence of bainite is possible. Finally, it is shown that the texture is not strongly affected during ultra-fast heating, and the recovery and recrystallization of ferrite are taking place simultaneously with the α → γ transformation.

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Section: Introductionmentioning

confidence: 99%

The Effect of Ultra-Fast Heating on the Microstructure, Grain Size and Texture Evolution of a Commercial Low-C, Medium-Mn DP Steel

Banis

Durán

Bliznuk

et al. 2019

Metals

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“…It can be summarized that two consecutive tempering processes can significantly promote the precipitation of carbides, which serve as sources of micro-cracks in the initial fracture stage. 26,27) Quasi-cleavage planes are likely to develop during the fracture process when bands of largesized carbides have formed, [28][29][30] leading to a significant drop in toughness and elongation.…”

Section: Microstructures and Fracture Morphologiesmentioning

confidence: 99%

Simultaneous Improvement of Toughness and Fatigue Life in a Typical Ultrahigh Strength Steel by a New Deep Cryogenic Treatment Process

et al. 2021

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“…Microcracks initiating and propagating along phase boundaries and slip bands are observed in Ti-6Al-4V during in-situ tensile deformation [20]. These micro pores act as nucleation sites for crack coalescence and growth resulting in damage, reminiscent of ductile fracture [24,25]. At optimum values of the acting shear stress, the micro-cracks nucleated at the notch edge are propagated along the interface with the through thickness-cracks oriented 45 0 to the tensile axis; Figure 11a.…”

Section: Damage Evolutionmentioning

confidence: 99%

“…J.S Kwame et alJournal of Materials and Applications 2021;10(1):[15][16][17][18][19][20][21][22][23][24][25][26] …”

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Influence of Sheet Conditions on In-Plane Strain Evolution via Ex-Situ Tensile Deformation of Ti-3Al-2.5V at Room Temperature

Kwame¹,

Yakushina

Blackwell

2021

J. Mater. Appl.

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Localised plastic deformation evolution was examined in a near alpha Ti-3Al-2.5V alloy with indent defect and defect free surfaces using digital image correlation, an interrupted uniaxial tensile test and scanning electron microscopy. The main aim was to understand the role of the localised strain evolution at micro scale and the underlying deformation mechanisms that influence the global mechanical behaviour of the material. The microstructures captured at different stages of deformation were processed using a digital image correlation system, whose outputs were analysed through Matlab, to ascertain the localised strain evolution observed in each surface condition. This work found that the strains observed at the deformation bands along the indent defect edge, were significantly higher than those observed in the deformed β phase field. The deformation bands concentrating at the tip of the indent defect acted as a fertile site for early crack nucleation and propagation with a reduced localised fracture strain. For a defect free surface, the absence of defect zones acting as a high stress concentration site meant that strain aggregation was minimised and the α phase field was able to sufficiently accommodate the β phase deformation resulting in higher fracture strains.

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Microstructural analysis of ductility and fracture in fine-grained and ultrafine-grained vanadium-added DP1300 steels

Cited by 46 publications

References 21 publications

The Effect of Ultra-Fast Heating on the Microstructure, Grain Size and Texture Evolution of a Commercial Low-C, Medium-Mn DP Steel

The Effect of Ultra-Fast Heating on the Microstructure, Grain Size and Texture Evolution of a Commercial Low-C, Medium-Mn DP Steel

Simultaneous Improvement of Toughness and Fatigue Life in a Typical Ultrahigh Strength Steel by a New Deep Cryogenic Treatment Process

Influence of Sheet Conditions on In-Plane Strain Evolution via Ex-Situ Tensile Deformation of Ti-3Al-2.5V at Room Temperature

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