Recrystallization kinetics of a cold rolled dual‐phase steel sheet

Bunge, H. J.; Vlad, Constantin M.; Kopp, Hans-Hermann

doi:10.1002/srin.198405329

Cited by 12 publications

(7 citation statements)

References 5 publications

(1 reference statement)

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“…This means that in all routes when the intercritical soaking stage is reached, the ferrite grains are fully recrystallized. This is in agreement with earlier reported data for different chemical compositions [16,17,19]. Therefore, the sample with the heating rate H3 got recrystallized well below the AC 1 temperature (704 • C); Samples with heating rate H1 recrystallized above the AC 1 temperature.…”

Section: Discussionsupporting

confidence: 93%

“…These are (i) heating to the intercritical temperature regions, (ii) soaking in order to allow the nucleation and growth of austenite, (iii) slow cooling to the quench temperature, (iv) rapid cooling to transform the austenite into martensite and (v) overaging and air cooling. The amount and morphology of the constituents formed are dependent on the annealing parameters [15][16][17][18][19]. The effect of the intercritical annealing parameters on the microstructure i.e.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of texture at the initial stages of continuous annealing of cold rolled dual-phase steel: Effect of heating rate

Chowdhury

Pereloma

Santos

2008

Materials Science and Engineering: A

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Evolution of texture at the initial stages of continuous annealing of cold rolled dual-phase steel: Effect of heating rate

Chowdhury

Pereloma

Santos

2008

Materials Science and Engineering: A

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“…whether the austenitisation is one-, two-or threedimensional. 17 In alloy A, a low value of m lying between 0?639 and 0?642 in the first stage and an enhanced value between 0?842 and 1?157 in the second stage of austenitisation clearly indicate a dimensionality of ,1 which means a near unidirectional growth of the austenite nuclei.…”

Section: Characterisation Of Austenitised Samplesmentioning

confidence: 94%

Kinetics of austenitisation of ductile irons containing two different contents of manganese and copper

Dasgupta

Mondal

Chakrabarti³

et al. 2012

International Journal of Cast Metals Research

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This work deals with the study of austenitisation behaviour of two ductile irons: alloy A [3?18C-2?64Si-0?45Mn (wt-%)] and alloy D [3?18C-3?0Si-1?04Mn-1?13Cu (wt-%)]. Samples were austenitised at 850, 900 and 950uC with varying times and then quenched in water. Following special etching techniques, the possible nucleation sites for austenitisation (transformed to martensite on quenching) have been identified as the ferrite/cementite interfaces within the pearlite matrix as well as the pearlite colony boundaries. Austenitisation also occurs in an epitaxial manner beyond the ferrite rims already existing around the graphite nodules. The kinetics of austenitisation is analysed from the volume fraction of austenite/martensite formed after known intervals of time at constant temperature using Avrami type relationship. In alloy A, the beginning of austenitisation is characterised by a dimensionality of ,1, followed by an unidirectional growth in the later stages. Austenitisation in alloy D conforms to a dimensionality of 1 followed by twodimensional growth at later stages. The activation energies measured from Arrhenius plots range between 50 and 115 kJ mol 21 K 21 and between 45 and 53 kJ mol 21 K 21 in alloys A and D respectively.

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“…A fast heating rate delays recrystallization and enhances the volume fraction of austenite at a given soaking temperature in the intercritcal region. Bunge et al [19] remarked that the kinetics of ferrite recrystallization up to about 70 volume percent is governed by the kinetics of dissolution of fine iron carbide particles and the coarsening of larger ones. Thus, recrystallization proceeds ahead of austenite formation.…”

Section: Microstructural Refinement and Homogenizationmentioning

confidence: 99%

Metallurgical Effects of Niobium in Dual Phase Steel

Mohrbacher

Yang

Chen

et al. 2020

Metals

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Dual phase (DP) steels are widely applied in today’s automotive body design. The favorable combination of strength and ductility in such steels is in first place related to the share of ferrite and martensite. The pronounced work hardening behavior prevents localized thinning and allows excellent stretch forming. Niobium microalloying was originally introduced to dual phase steel for improving bendability by refining the microstructure. More recently developed “high ductility” (HD) DP steel variants provide increased drawability aided by a small share of austenite retained in the microstructure. In this variant niobium microalloying produces grain refinement and produces a dispersion of nanometer-sized carbide precipitates in the steel matrix which additionally contributes to strength. This study investigates the microstructural evolution and progress of niobium precipitation during industrial processing of high-ductility DP 980. The observations are interpreted considering the solubility and precipitation kinetics of niobium. The influences of niobium on microstructural characteristics and its contributions to strength and formability are discussed.

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Recrystallization kinetics of a cold rolled dual‐phase steel sheet

Abstract: Determination of the recrystallization kinetics by optical microscopy and hardness test. The activation energy corresponds to that of carbon‐diffusion in α Fe. Determination of the recrystallization texture from X‐ray pole figures.

Cited by 12 publications

References 5 publications

Evolution of texture at the initial stages of continuous annealing of cold rolled dual-phase steel: Effect of heating rate

Evolution of texture at the initial stages of continuous annealing of cold rolled dual-phase steel: Effect of heating rate

Kinetics of austenitisation of ductile irons containing two different contents of manganese and copper

Metallurgical Effects of Niobium in Dual Phase Steel

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