Ultrafine Grained Ferrite/Martensite Dual Phase Steel Fabricated by Large Strain Warm Deformation and Subsequent Intercritical Annealing

Calcagnotto, M.; Ponge, Dirk; Raabe, Dierk

doi:10.2355/isijinternational.48.1096

Cited by 69 publications

(52 citation statements)

References 14 publications

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“…Mukherjee et al 25) proposed a processing route based on deformation-induced ferrite transformation (DIFT) and studied the effect of molybdenum and niobium on microstructure evolution. In two previous studies, we demonstrated that UFG DP steels can be produced by large strain warm deformation followed by intercritical annealing 26) and clarified the critical importance of a certain manganese content on microstructure evolution. 26,27) However, there is a lack of systematic studies on the processing parameters that control the microstructure evolution in UFG DP steels.…”

Section: Introductionmentioning

confidence: 70%

“…In two previous studies, we demonstrated that UFG DP steels can be produced by large strain warm deformation followed by intercritical annealing 26) and clarified the critical importance of a certain manganese content on microstructure evolution. 26,27) However, there is a lack of systematic studies on the processing parameters that control the microstructure evolution in UFG DP steels. In contrast, the microstructure evolution during intercritical annealing was extensively studied in coarse grained DP steels that were produced by conventional hot © 2012 ISIJ and/or cold rolling.…”

Section: Introductionmentioning

confidence: 70%

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Microstructure Control during Fabrication of Ultrafine Grained Dual-phase Steel: Characterization and Effect of Intercritical Annealing Parameters

2012

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An ultrafine grained (UFG) ferrite/cementite steel was subjected to intercritical annealing in order to obtain an UFG ferrite/martensite dual-phase (DP) steel. The intercritical annealing parameters, namely, holding temperature and time, heating rate, and cooling rate were varied independently by applying dilatometer experiments. Microstructure characterization was performed using scanning electron microscopy (SEM) and high-resolution electron backscatter diffraction (EBSD). An EBSD data post-processing routine is proposed that allows precise distinction between the ferrite and the martensite phase. The sensitivity of the microstructure to the different annealing conditions is identified. As in conventional DP steels, the martensite fraction and the ferrite grain size increase with intercritical annealing time and temperature. Furthermore, the variations of the microstructure are explained in terms of the changes in phase transformation kinetics due to grain refinement and the manganese enrichment in cementite during warm deformation.

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Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 70%

Microstructure Control during Fabrication of Ultrafine Grained Dual-phase Steel: Characterization and Effect of Intercritical Annealing Parameters

2012

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“…Regarding that martensite has an almost the same crystallographic structure as BCC, low Kikuchi diffraction pattern quality and density of particular grain boundaries or dislocations are utilized to separate it from ferrite. A typical example is dual phase steel (Calcagnotto et al, 2008;Pinard et al, 2013). Both phases have been successfully distinguished because they show clearly different features.…”

Section: Introductionmentioning

confidence: 99%

A Correlative Approach for Identifying Complex Phases by Electron Backscatter Diffraction and Transmission Electron Microscopy

Seol

Jafari

et al. 2017

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A new method was introduced to distinguish the ferrite, bainite and martensite in transformation induced plasticity (TRIP) steel by using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). EBSD is a very powerful microstructure analysis technique at the length scales ranging from tens of nanometers to millimeters. How ever, iron BCC phases such as ferrite, bainite and martensite cannot be easily distinguished by EBSD due to their similar surface morphology and crystallographic structure. Among the various EBSD-based methodology, image quality (IQ) values, which present the perfection of a crystal lattice, was used to distinguish the iron BCC phases. IQ values are very useful tools to discern the iron BCC phases because of their different density of crystal defect and lattice distortion. However, there are still remaining problems that make the separation of bainite and martensite difficult. For instance, these phases have very similar IQ values in many cases, especially in deformed region; therefore, even though the IQ value was used, it has been difficult to distinguish the bainite and martensite. For more precise separation of bainite and martensite, IQ threshold values were determined by a correlative TEM analysis. By determining the threshold values, iron BCC phases were successfully separated.

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“…[1 -3] examined the effect of cooling rates; the effect of alloying element on mechanical properties was investigated by [4 -12]; while [13,16,17] worked on the effect of the temperature. Furthermore, [14,15,17] examined strain or deformation effect while [15, 18 -21] examined the impact of microstructure on mechanical properties of the investigated steels.…”

Section: Introductionmentioning

confidence: 99%

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2017

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Ultrafine Grained Ferrite/Martensite Dual Phase Steel Fabricated by Large Strain Warm Deformation and Subsequent Intercritical Annealing

Cited by 69 publications

References 14 publications

Microstructure Control during Fabrication of Ultrafine Grained Dual-phase Steel: Characterization and Effect of Intercritical Annealing Parameters

Microstructure Control during Fabrication of Ultrafine Grained Dual-phase Steel: Characterization and Effect of Intercritical Annealing Parameters

A Correlative Approach for Identifying Complex Phases by Electron Backscatter Diffraction and Transmission Electron Microscopy

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