Formation of Ultrafine Grained Dual Phase Steels through Rapid Heating

Azizi-Alizamini, Hamid; Militzer, Matthias; Poole, Warren J.

doi:10.2355/isijinternational.51.958

Cited by 109 publications

(50 citation statements)

References 26 publications

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“…Increasing the holding time increases the austenite volume fraction, which then will transform to martensite upon quenching in the water. Therefore, VM increased with increasing intercritical annealing time, as reported by Qu et al 15) and Azizi-Alizamini et al 12) As shown in Fig. 3(b), microstructural feature of the cold-rolled duplex structure is consisted of high density of ferrite/martensite interfaces which can be nucleation sites for austenite formation (Fig.…”

Section: Microstructuressupporting

confidence: 65%

“…Azizi-Alizamini et al 12) also reported that the volume fraction of coarse ferrite grains increased with increasing intercritical annealing time. Figure 7 shows the hardness variation of both 50 and 80% cold-rolled samples with increasing intercritical annealing time.…”

Section: Microstructuresmentioning

confidence: 92%

“…As shown in Fig. 12, graphs of UTS and UTS × UE vs. UE has been plotted to compare the DP steels developed in this study with the DP steels from literature 6,10,12,16,18,33) and commercial modern high strength automobile steel, DP980.…”

Section: )mentioning

confidence: 99%

“…DIFT and warm deformation are again not very promising due to huge deformation induced at high temperatures. Azizi-Alizamani et al 12) developed UFG-DP steels by rapid intercritical annealing. The major drawback of this approach is the very high heating and cooling rates needed (300°C/s © 2015 ISIJ and 1 000°C/s, respectively).…”

Section: Introductionmentioning

confidence: 99%

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Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

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Dual phase (DP) steels have been investigated using a new approach utilizing simple cold-rolling and subsequent intercritical annealing of a martensite-ferrite duplex starting structure. The ferrite grain size and volume fraction of martensite were varied by changing the rolling reduction and intercritical annealing time. Ultrafine grained DP (UFG-DP) steel with an average grain size of about 2 μm was achieved by short intercritical annealing of the 80% cold-rolled duplex microstructure. Tensile testing revealed superior mechanical properties (the ultimate tensile strength of 1 100 MPa and elongation of 13%) for the new DP steel in comparison with the commercially used high strength DP980 steel. The variations in hardness, strength and elongation of the specimens with rolling reduction and intercritical holding time were correlated to microstructural characterizations. The inherent mechanism for strengthening of the DP steel was discussed and the contribution of each strengthening factor was quantitatively calculated. The results showed that the calculated yield strength (430.6 MPa) is very close to the measured value (422 MPa).

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Section: Microstructuressupporting

confidence: 65%

Section: Microstructuresmentioning

confidence: 92%

Section: )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

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“…The exact nature of the interaction between ferrite recrystallization and austenite formation in steel has been studied by several authors . The present authors consider that both processes are rather independent of each other due to the different nature of the driving forces involved.…”

Section: Discussionmentioning

confidence: 91%

“Flash” Annealing in a Cold‐Rolled Low Carbon Steel Alloyed with Cr, Mn, Mo, and Nb: Part II—Anisothermal Recrystallization and Transformation Textures

Cerda¹,

Kestens

Petrov

2018

steel research int.

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The aim of the present investigation is to study the microstructure and texture evolution in a cold‐rolled low carbon steel subjected to continuous heating and subsequent quenching. Peak‐annealing and quenching experiments are carried out at different temperatures at three heating rates (10, 400, and 1000 °C s−1). The texture evolution in ferrite and martensite is analyzed separately via Electron Backscattered Diffraction (EBSD) measurements. It is observed that the recrystallization is virtually completed at 771 °C in samples heated at 10 °C s−1. Conversely, the recrystallization is suppressed in samples heated at rates ≥400 °C s−1. In samples heated at 10 °C s−1, the ferrite texture evolves according to the well‐known recrystallization behavior, showing a maximum in {113}<110> components, whereas in samples heated at rates ≥400 °C s−1, the texture is similar to the one of the cold‐rolled material. It is concluded that the texture evolution in martensite is strongly dependent on the evolution of recrystallization textures in ferrite. A particular grain substructure product of the interaction between the recrystallization of ferrite and massive austenite formation is observed after heating at rates ≥400 °C s−1. However, this substructure seems to have effect neither on the textures of ferrite nor on the work hardening behavior.

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Enhancement of work‐hardening behavior of dual phase steel by heat treatment

Nasiri

Mirzadeh

2018

Materialwissenschaft Werkst

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The work‐hardening response and mechanical properties of dual phase steels originated from different initial microstructures under low and high martensite volume fractions were investigated using a typical carbon‐manganese steel. The modified Crussard‐Jaoul analysis was used for studying the work‐hardening stages and the deformation behavior of ferrite and martensite. It was revealed that the initial martensitic microstructure before intercritical annealing is much better than the full annealed banded ferritic‐pearlitic and spheroidized microstructures in terms of work‐hardening capacity and strength‐ductility trade off. By increasing the amount of martensite, via intercritical annealing at higher temperatures, the ductility decreased but the tensile toughness of dual phase steels increased toward reaching the domain of extra‐advanced high‐strength steels due to the enhancement of work‐hardening rate.

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Formation of Ultrafine Grained Dual Phase Steels through Rapid Heating

Cited by 109 publications

References 26 publications

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

“Flash” Annealing in a Cold‐Rolled Low Carbon Steel Alloyed with Cr, Mn, Mo, and Nb: Part II—Anisothermal Recrystallization and Transformation Textures

Enhancement of work‐hardening behavior of dual phase steel by heat treatment

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