Microstructural evolution at the initial stages of continuous annealing of cold rolled dual-phase steel

Rocha, Roberta O.; Melo, Túlio Magno Füzessy de; Pereloma, Elena V.; Santos, Dagoberto Brandão

doi:10.1016/j.msea.2004.08.081

Cited by 120 publications

(54 citation statements)

References 15 publications

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“…The bainitic plate thickness was measured by the mean lineal intercept L = p t a /2 in a direction normal to the plate length. 14,29 TEM specimens were sampled from the heattreated samples and the cross-sections of tensile samples. The disks with 3 mm in diameter were punched, using a Gatan disk punch 659, mechanically thinned to 0.06 mm, and then twin-jet electropolished to perforation using a mixture of 5% perchloric acid, 25% glycerol, and 70% ethanol at 5°C at 45 V. The samples were examined on a Philips Tecnai F30 FEG-TEM microscope (Philips, Amsterdam, The Netherlands) operated at 300 kV.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

Morales-Rivas

Yen

Huang

et al. 2015

JOM

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The present work is concerned with the study of the relationship between microstructure and ductility of nanostructured bainite. The tensile behavior of two steels treated at the same temperature during different times has been analyzed. Special attention has been paid to the role that the retained austenite mechanical stability plays in enhancing the ductility through its contribution to the work-hardening and the damage resistance of these materials. The results have shown that the relative mechanical properties of the phases present affect both the martensitic transformation behavior and the total elongation.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

Morales-Rivas

Yen

Huang

et al. 2015

JOM

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“…DP steels are produced by annealing low-carbon steel in the intercritical temperature range to produce ferrite-austenite mixtures, followed by fast cooling to transform the austenite phase into martensite. A significant body of work on DP steel is available in the literature [1][2][3][4]. Final mechanical properties and microstructure of DP steels are dependent on the volume fraction [5,6], morphology [7,8], and distribution of martensite, which in turn are determined by the composition and state of the parent austenite phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of heating rate on ferrite recrystallization and austenite formation of cold-roll dual phase steel

Meng

et al. 2013

Journal of Alloys and Compounds

103

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“…Due to the economic and ecological considerations, the reduction in mass is desired. Dual-phase (DP) steel is low-carbon and low-alloy steel with vol% of martensite and a ductile ferrite matrix, which is widely used in the automotive industry because of the good combination of high strength and good formability at low production costs [1][2][3][4]. DP steel is characterized by a continuous yielding behavior with a low initial flow stress and a high initial strain-hardening rate [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat-Treatment Schedule on the Microstructure and Mechanical Properties of Cold-Rolled Dual-Phase Steels

Deng

Zhang

2015

Acta Metall. Sin. (Engl. Lett.)

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Low-carbon (0.08 wt% C) steel has been subjected to three different heat treatments to obtain dual-phase steels with different microstructures. An understanding of structure-property was established through tensile tests, in conjunction with scanning electron microscope and transmission electron microscope. The results show that the steel after intermediate quenching (IQ) consisting of fine and fibrous martensite exhibited the intermediate strength, highest elongation and the best comprehensive performance of mechanical properties, whereas the steel subjected to intercritical annealing (IA) produced a network martensite along ferrite grain boundaries, having the lowest strength and intermediate elongation. Besides, step quenching (SQ) resulted in a coarse and blocky ferrite-martensite microstructure showing the worst mechanical properties of the three different heat-treatment conditions. The strain-hardening behavior was studied through the modified CrussardJaoul model, indicating two stages of strain-hardening behavior for all three samples. The highest magnitude of strainhardening ability was obtained by IQ annealing routes. The analysis of the fractured surface revealed that ferrite/martensite interfaces are the most susceptible for microvoid nucleation. However, martensite microcracks were also observed in SQ sample, and the microvoids are nucleated within the ferrite grain in IA sample as well. The variations in strength, elongation, strain-hardening behavior and fracture mechanism of the steel with different heat-treatment schedules were further discussed in relation to the microstructural features.

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Microstructural evolution at the initial stages of continuous annealing of cold rolled dual-phase steel

Cited by 120 publications

References 15 publications

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

Effect of heating rate on ferrite recrystallization and austenite formation of cold-roll dual phase steel

Effect of Heat-Treatment Schedule on the Microstructure and Mechanical Properties of Cold-Rolled Dual-Phase Steels

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