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

Li, Pei; Li, Jun; Meng, Qingguo; Hu, Wenbin; Xu, Duo

doi:10.1016/j.jallcom.2013.05.226

Cited by 107 publications

(53 citation statements)

References 18 publications

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“…As the interaction occurs, the kinetics of recrystallization and transformation are increased. 3,6,13,16,21 The austenite phase nucleates first at the deformed ferrite grain boundaries. 22 On the other hand, austenite provides a preferred recrystal- lization nucleation site for the non-recrystallized ferrite.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…2,3 This annealing is followed by furnace soaking to complete the recrystallization. 3 However, in low-carbon steel the grain refinement after conventional annealing needs to combine the steel's chemical composition and the annealing cycle. 4,5 Also, the phase transformation during conventional annealing in the intercritical temperature range does not influence the grain refinement of deformed low-carbon steel.…”

Section: Introductionmentioning

confidence: 99%

“…URA shifts the start temperature of recrystallization to higher values near and above Ac 1 . 3,[7][8][9][10][11][12][13][14][15] So, in the intercritical temperature range, recrystallization and phase transformation proceed concurrently and with a mutual "interaction". The intensity of the interaction depends of the amount of stored energy and determines the final microstructure of the steel.…”

Section: Introductionmentioning

confidence: 99%

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Grain-refining ability of ultra-rapid annealing for low-carbon steel: severe plastic deformation

Mostafaei¹,

Kazeminezhad²

2017

Mater. Tehnol.

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To study the grain-refinement ability of ultra-rapid annealing (URA), heating rates from 0.3°C/s up to 1200°C/s with conventional annealing and URA in the intercritical temperature range were performed on severely deformed low-carbon steel. The results show that recrystallization in conventional annealing is completed below the critical temperature of Ac1 without grain refinement. URA up to 730°C at a heating rate of 200°C/s causes grain refinement due to full interaction between the recrystallization and phase transformation. URAs up to 730°C with heating rates of 600°C/s and 1000°C/s lead to partial grain refinement and no grain refinement, respectively. During annealing with a heating rate of 1200°C/s, the temperature should reach 760°C for the occurrence of recrystallization leading to grain refinement. The sample URAed at 600°C/s up to 730°C shows the maximum hardness due to fine grains being partially formed. Keywords: conventional annealing, ultra-rapid annealing, interaction, severe plastic deformation Za {tudij sposobnosti udrobnjenja zrn pri zelo hitrem`arjenju, so bile uporabljene hitrosti segrevanja od 0,3°C/s do 1200°C/s pri obi~ajnem in zelo hitrem`arjenju v interkriti~nem temperaturnem obmo~ju na mo~no deformiranem malooglji~nem jeklu. Rezultati ka`ejo, da je rekristalizacija pri konvencionalnem`arjenju zaklju~ena pod kriti~no temperaturo Ac1 brez udrobnjenja zrn. Zelo hitro`arjenje do 730°C pri hitrosti ogrevanja 200°C/s povzro~i udrobnjenje zrn, zaradi polne interakcije med rekristalizacijo in fazno premeno. Zelo hitro`arjenje do 730°C , s hitrostjo ogrevanja 600°C/s in 1000°C/s povzro~i delno udrobnjenje zrn oz. udrobnjenja zrn ni. Med ogrevanjem s hitrostjo 1200°C/s je potrebno dose~i temperaturo 760°C, da se pojavi rekristalizacija, ki povzro~i udrobnitev zrn. Vzorec po zelo hitrem`arjenju z 600°C/s do 730°C ka`e maksimalno trdoto zaradi delnega nastanka drobnih zrn.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Grain-refining ability of ultra-rapid annealing for low-carbon steel: severe plastic deformation

Mostafaei¹,

Kazeminezhad²

2017

Mater. Tehnol.

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“…In the case of CA sample, the ferrite recrystallization would fully complete when heated to the intercritical zone and then austenite nucleation at recrystallization ferrite grain boundaries and grows along them [9,10]. In addition, at lower heating rate, there are sufficient time for ferrite and austenite grains to grow which produce larger ferrite and martensite grain.…”

Section: Microstructural Evaluationmentioning

confidence: 99%

Effect of higher heating rate during continuous annealing on microstructure and mechanical properties of cold-rolled 590 MPa dual-phase steel

Deng

Zhang

et al. 2015

MATEC Web of Conferences

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Abstract. In this presentation, the effect of higher heating rate in continuous annealing on microstructure and mechanical properties of a cold-rolled 590 MPa ferrite-martensite dualphase steel were investigated by using microstructural observation and mechanical property measurement. The results show that compared with the conventional continuous annealed steels heated at a rate of 5 • C/s (CA), the average ferrite grain sizes heated at a higher rate (300 • C/s, HRA) was obviously refined from 15.6 m to 5.3 m. The morphology of martensite is observed to shift from network along ferrite grain boundaries to uniformly dispersed in the final DP590 microstructure. Twinned substructure of martensite can be found when heated at a higher heating rate in continuous annealing. EBSD orientation maps show that the fraction of low angle grain boundary is increased in HRA sample compared to CA sample. The HRA sample has excellent mechanical properties when compared to the CA sample. The variations of strength, elongation, strain hardening behavior and fracture mechanism of the this DP590 steel with different heating routine were further discussed in relation to microstructural features.

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Effect of Starting Microstructure through Severe Plastic Deformation and Ultra-Rapid Annealing of Low-Carbon Steel

Mostafaei

Kazeminezhad

2016

steel research int.

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In this research, low-carbon steel sheets with two different microstructures containing carbides (as-received steel) and pearlites (austenitized steel) are subjected to severe plastic deformation (SPD), and ultra-rapid annealing (URA) is applied with the heating rate of 200 8C s À1 up to the intercritical temperature near Ac 1 . Microstructure of SPDed as-received steel after URA is consisted of fully refined ferrite grains surrounded by fine pearlites; but for SPDed austenitized steel, grain refinement is not observed, and microstructure is consisted of martensite and high fraction of coarse non-recrystallized ferrite. Presence of carbides for SPDed as-received steel leads to strong interaction between ferrite recrystallization and ferrite transformation to austenite, which causes to refined final microstructure after URA. However, initial pearlites in SPDed austenitized sample prevent the occurrence of strong interaction during URA. For austenitized sample, URA of SPDed steel increases the strength and ductility about 28 and 12%, respectively. Also, for as-received sample, it increases the strength about 32% but decreases the ductility about 11%.

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

Cited by 107 publications

References 18 publications

Grain-refining ability of ultra-rapid annealing for low-carbon steel: severe plastic deformation

Grain-refining ability of ultra-rapid annealing for low-carbon steel: severe plastic deformation

Effect of higher heating rate during continuous annealing on microstructure and mechanical properties of cold-rolled 590 MPa dual-phase steel

Effect of Starting Microstructure through Severe Plastic Deformation and Ultra-Rapid Annealing of Low-Carbon Steel

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