Effect of Cr Additions on Ferrite Recrystallization and Austenite Formation in Dual-Phase Steels Heat Treated in the Intercritical Temperature Range

Filho, José Francisco da Silva; Oliveira, Carlos A. S.; Fonstein, Nina; Girina, O.; Miranda, Fabiano José Fabri; Drumond, Juliovany; Serafim, Eder Adolfo; Afonso, Conrado Ramos Moreira

doi:10.1590/1980-5373-mr-2015-0641

Cited by 13 publications

(4 citation statements)

References 14 publications

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“…In addition, since Cr is a strong carbide-forming element, Cr has a strong connection with carbon, resulting in difficulties in moving the phase interface. As the above factors are keys aspect of the It can be seen that the grain size of the ferrite of Cr-free steel is large, while the grain size is fine in 0.3Cr steel, as the addition of Cr accelerates the recrystallization of ferrite [21]. As the Cr content increases, the ferrite is subjected to rapid recrystallization and growth during the inter-critical isothermal process.…”

Section: Effect Of Cr On Microstructure Evaluationmentioning

confidence: 99%

“…Additionally, the grain size and the distribution of local misorientation are examined by EBSD. The inverse pole figure (IPF) color maps corresponding to the microstructure obtained by Process 2 and the arrows pointing to the different phase are shown in Figure 4.It can be seen that the grain size of the ferrite of Cr-free steel is large, while the grain size is fine in 0.3Cr steel, as the addition of Cr accelerates the recrystallization of ferrite[21]. As the Cr content increases, the ferrite is subjected to rapid recrystallization and growth during the inter-critical isothermal process.…”

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confidence: 99%

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Effect of Chromium on Microstructure and Mechanical Properties of Hot-Dip Galvanized Dual-Phase (DP980) Steel

Chen,

Liang,

Yang

et al. 2023

Crystals

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Generally, the addition of Chromium (Cr) into the dual-phase (DP) steels can suppress bainitic transformation. In this work, the continuous hot-dip galvanization of DP980 steel is thermally simulated with various Cr contents of 0/0.3/0.6 wt.%, and the effect of Cr on bainitic transformation and properties of steels is studied. The results indicate that the bainitic transformation is obviously inhibited. The fraction of bainite decreases with the increasing Cr content. The incubation time is prolonged in the 0.6Cr steel with a slower bainitic transformation rate. Compared to that of 0 and 0.3Cr steels, the 0.6Cr steel exhibits a high tensile strength of 1033 MPa and uniform elongation of 9.1% due to the rapid strain-hardening rate. As a result, the mechanical properties of 0.6Cr steel satisfy the requirements of hot-dip galvanized DP980 steel.

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Section: Effect Of Cr On Microstructure Evaluationmentioning

confidence: 99%

mentioning

confidence: 99%

Effect of Chromium on Microstructure and Mechanical Properties of Hot-Dip Galvanized Dual-Phase (DP980) Steel

Chen,

Liang,

Yang

et al. 2023

Crystals

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“…The nucleation and growth of austenite in steels during the annealing processes have been widely investigated [124,125,[141][142][143][144][145][146][147][148][149][150][151]. It is known that austenitic grain size affected the martensite start temperature [152][153][154].…”

Section: Nucleation and Growth Of New Grainsmentioning

confidence: 99%

“…Moreover, the excessive addition of vanadium had a deteriorative effect on the mechanical properties of UFG-DP steels. Silva Filho et al [142] explored the effects of chromium addition on ferrite recrystallisation and austenite formation during intercritical annealing of DP steels. It was found that addition of moderate chromium content up to 0.2% accelerated the ferrite recrystallisation regarding both nucleation and growth and subsequently resulted in coarse ferrite grains in the final DP microstructure.…”

Section: Alloying Elementsmentioning

confidence: 99%

Processing, microstructure adjustments, and mechanical properties of dual phase steels: A review

Kalhor

Taheri

Mirzadeh

et al. 2021

Materials Science and Technology

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In this review, effects of initial microstructure before intercritical annealing and processing routes of dual phase (DP) high strength steels are discussed. Prior-applied deformation processes as cold rolling and severe plastic deformation (SPD) including their impacts on mechanical properties of DP steels are described. Influences of heating rate, recrystallization of ferrite, nucleation and grain growth of austenite on the microstructure evolution are also presented. The intercritical annealing and thermomechanical processes of DP steels are comparatively outlined. Furthermore, post-intercritical annealing treatments, i.e., tempering, bake hardening, strain and quench aging are argued. Effects of key alloying elements on the microstructure and mechanical properties of DP steels are briefly summarized. A further development of DP steels can properly benefit from this extensive review.

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Damage Evolution and Microstructural Fracture Mechanisms Related to Volume Fraction and Martensite Distribution on Dual‐Phase Steels

Avendaño-Rodríguez

Rodríguez-Baracaldo

Weber

et al. 2023

steel research int.

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Currently, the steel manufacturing industry faces significant challenges in meeting the necessary processing requirements to develop low-weight and high-strength materials through efficient and clean production routes. For example, in the transportation and automotive manufacturing industries, lightweight structural materials that enhance the autonomy versus fuel consumption ratio, improve passenger safety, and optimize processing costs, are increasingly a mandatory requirement in the research and development of recent manufacturing projects. [1] In this sense, the development of advanced high-strength steels (AHSS), particularly dual-phase steels (DP), has enabled the improvement of automotive engineering safety through the use of sheet metal members (safety cage components, roof rails, and rear shock reinforcements) with thin walls to improve crashworthiness. [2,3] Low-carbon dual-phase steels consist of a ferrite matrix and a second phase of distributed martensite. The two phases combined, usually produced by intercritical heat treatments (IHT) and water quenching, are responsible for the plastic flow mechanism observed in these steels. [4,5] Shear stresses are generated along grain boundaries due to the austenite to martensite transformation during the quenching process. Therefore, due to these microstructure volume changes, dislocation density increases. [6,7] As a result, a pile-up of sliding unanchored dislocations reduces yield stress and interacts to produce a high work-hardening rate. [8] Hence, the continuous plastic flow behavior evidenced by dual-phase steel results from the above-mentioned factors. [9] The deformation process of

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Effect of Cr Additions on Ferrite Recrystallization and Austenite Formation in Dual-Phase Steels Heat Treated in the Intercritical Temperature Range

Cited by 13 publications

References 14 publications

Effect of Chromium on Microstructure and Mechanical Properties of Hot-Dip Galvanized Dual-Phase (DP980) Steel

Effect of Chromium on Microstructure and Mechanical Properties of Hot-Dip Galvanized Dual-Phase (DP980) Steel

Processing, microstructure adjustments, and mechanical properties of dual phase steels: A review

Damage Evolution and Microstructural Fracture Mechanisms Related to Volume Fraction and Martensite Distribution on Dual‐Phase Steels

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