The development of some dual-phase steel structures from different starting microstructures

Cai, Xueling; Garratt‐Reed, Anthony J.; Owen, W. S.

doi:10.1007/bf02814228

Cited by 93 publications

(39 citation statements)

References 15 publications

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“…[8][9][10][11][12][13] In those works, the authors emphasised the importance of the microstructure immediately before intercritical annealing. Roosz et al 14 determined the influence of the initial microstructure on the nucleation rate and grain growth of austenite during isothermal treatment of a eutectoid plain carbon steel.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and dilatometric behaviour of non-isothermal ferrite–austenite transformation

Caballero¹,

Capdevila

Andrés³

2001

Materials Science and Technology

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A model that describes the ferrite-to-austenite transformation during continuous heating in ARMCO iron and three very low carbon low manganese steels with a fully ferrite initial microstructure is presented in this work. This model allows to calculate the volume fraction of austenite and ferrite during transformation as a function of temperature and thus to know the austenite formation kinetics under non-isothermal conditions in full ferritic steels. Moreover, since dilatometric analysis is a technique very often employed to study phase transformations in steels, a second model, that describes the dilatometric behaviour of the steel and calculates the relative change in length which occurs during the ferrite-to-austenite transformation, has been also

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Section: Introductionmentioning

confidence: 99%

Kinetics and dilatometric behaviour of non-isothermal ferrite–austenite transformation

Caballero¹,

Capdevila

Andrés³

2001

Materials Science and Technology

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“…They have demonstrated that a ferritemartensite microstructure promotes continuous yielding with a rapid rate of work hardening and improved elongation in comparison to a ferrite-pearlite microstructure [11]. Speich et al [12] categorised the intercritical austenitisation in low-carbon steels with a ferrite-pearlite starting microstructure into three stages: a) pearlite dissolution and growth of austenite into pearlite at a rate controlled primarily by carbon diffusion in the austenite; the growth rate of the austenite in this stage is expected to be rapid [12][13][14][15]; b) slower growth of austenite into ferrite; and c) slow equilibration in chemical composition of ferrite and austenite. García and DeArdo [11] pointed out that before complete dissolution of pearlite, the lamellar cementite particles spherodise and the carbon from the cementite particles diffuses towards the growing austenite.…”

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confidence: 99%

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Caballero

Capdevila

Andrés

2002

Journal of Materials Science

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The compiled knowledge in literature regarding the isothermal formation of austenite from different initial microstructures (pure and mixed microstructures), has been used in this work to develop a model for non-isothermal austenite formation in low-carbon steels (C<0.2 wt-%) with a mixed initial microstructure consisting of ferrite and pearlite. Likewise, calculations of relative change in length have been made as a function of temperature, and the differences between theoretical and experimental results have been analysed in 0.1C-0.5Mn low-carbon low-manganese steel. Experimental kinetic transformation, critical temperatures as well as the magnitude of the overall contraction due to austenite formation are in good agreement with calculations.

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“…This is consistent with manganese partitioning as observed by other investigators. 28,29) It is clear from Fig. 3 that cold rolled bands do not vanish during intercritical annealing, since austenite formation starts in the carbon-rich regions featuring pearlite.…”

Section: Microstructure Of Annealed Samplesmentioning

confidence: 98%

Evolution of Microstructural Banding during the Manufacturing Process of Dual Phase Steels

Caballero¹,

García-Junceda²,

Capdevila³

et al. 2006

Mater. Trans.

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The segregation of manganese during solidification from casting is responsible for banding problems of dual phase steels. Microstructural banding lasts during all the manufacture process, producing the deterioration of the material, so the final ductility and impact toughness of the sheets are decreased due to the high level of anisotropy. To avoid or reduce the problem of microstructural banding, it is proposed to modify the hot rolling parameters so the formation of ferrite-pearlite microstructures is avoided and thus the presence of banding. The study of the microstructural evolution during the whole manufacturing process reveals that the increase of the cooling rate during the hot rolling leads to a significant decrease of martensite banding in the microstructure of dual phase steels for sheets used in the automotive industry.

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The development of some dual-phase steel structures from different starting microstructures

Cited by 93 publications

References 15 publications

Kinetics and dilatometric behaviour of non-isothermal ferrite–austenite transformation

Kinetics and dilatometric behaviour of non-isothermal ferrite–austenite transformation

Untitled

Evolution of Microstructural Banding during the Manufacturing Process of Dual Phase Steels

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