Analysis of ferrite grain growth mechanisms during γ−α transformation in a niobium alloyed steel using EBSD

Novillo, E.; Hernández, D.; Gutiérrez, Isabel; López, Beatriz

doi:10.1016/s0921-5093(04)00916-5

Cited by 24 publications

(10 citation statements)

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“…The grain boundary character is also representative of the different steel microstructures, as shown in Fig 2 . All have a significant fraction of low angle boundaries (LAGB). In the ferrite-pearlite microstructure, such boundaries are created due to a selection of variants that occurs during transformation [19]. In the bainitic microstructure, LAGB-s correspond to the ferritic units within the bainitic packet and also to the boundary between certain packets [20], while the misorientation distribution for high angles depends on transformation product [21].…”

Section: Resultsmentioning

confidence: 99%

Microstructure-Mechanical Properties Relationships for Complex Microstructures in High Strength Steels

Iza-Mendia

Gutiérrez

2014

MSF

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Due to the increased complexity of steel microstructures, when considering the application of available Hall-Petch type equations for yield strength prediction, a number of difficulties raises. For example, the correlation between grain size measurements by EBSD technique and optical microscopy (OP) in complex microstructures is required in order to integrate data to the traditional equations developed for OP results and ferrite-pearlite microstructures. Besides, the introduction of some additional terms to the equations to account for precipitation, C in solution and forest dislocation contributions presents some difficulties that need to be overcome to improve prediction accuracy. Different microstructures (ferrite-pearlite, bainite, quenched and Q&T) have been produced by thermal and thermomechanical treatments, followed by microstructural characterisation and mechanical testing. A Hall-Petch coefficient dependent on the boundary misorientation distribution is proposed. This approach allows dealing in a similar way ferritic, bainitic and martensitic microstructures. The Hall-Petch coefficient, thus defined, corresponds to the previously proposed by Pickering for ferrite, while bainitic microstructures give a smaller value. Additionally, the equation used to express the fracture appearance transition temperature of ferritic-pearlitic microstructure has been generalized from the developments made in the calculation of the yield stress.

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Section: Resultsmentioning

confidence: 99%

Microstructure-Mechanical Properties Relationships for Complex Microstructures in High Strength Steels

Iza-Mendia

Gutiérrez

2014

MSF

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“…It is commonly observed that prior austenite grain boundaries are the most active sites for the nucleation of ferrite, formed from recrystallized austenite, Fig. 1-a [6,7]. By deforming the austenite below the non recrystallization temperature, the strain accumulates in this phase and the grains appear In addition to grain boundary nucleation, other sites can activate, like lattice defects (deformation and twin bands, dislocation arrays…) and second phase particles.…”

Section: Resultsmentioning

confidence: 99%

“…Different deformation sequences were applied in order to obtain a recrystallized or a deformed austenite microstructure prior to the transformation to ferrite. The tests and the applied conditions are described in [6] and [7] for Steel 1 and 2, respectively. Quenched samples were analyzed by optical and orientation imaging microscopy.…”

Section: Methodsmentioning

confidence: 99%

Factors Limiting the Achievable Ferrite Grain Refinement in Hot Worked Microalloyed Steels

Novillo

Cotrina²,

Iza-Mendia

et al. 2005

MSF

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Nb is added to C-Mn steels in order to use the solute drag and/or strain induced precipitation as a useful tool to condition the austenite in the hot rolling mill and produce during the subsequent cooling a refined ferrite grain size. The highest degree of refinement is obtained in conventional rolling mills by accumulating the deformation in austenite during the last passes, followed by early cooling in the run out table to produce a high density of nucleated ferrite grains. However, the maximum refinement is to a certain extent attenuated due to the ferrite grain coarsening taking place during the transformation. The present work analyses the different aspects limiting the final achievable ferrite grain refinement.

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“…In addition, SIF exhibited less deviation from the K-S OR compared to polygonal ferrite due to its preferential nucleation along prior austenite grain boundaries (Fig. 7(f)) while following the K-S OR with at least one neighbouring parent austenite [36].…”

Section: Strain-induced Ferrite Formationmentioning

confidence: 96%

“…10(b, c)), higher intensity and less spread were observed for the latter. This is probably due to the preferential nucleation of SIF grains along the prior austenite grain boundaries following the K-S OR with at least one neighbouring parent austenite [36], as well as the limited growth of SIF [41,42].…”

Section: Texture Evolutionmentioning

confidence: 99%

Strain-induced ferrite formation and its effect on mechanical properties of a dual phase steel produced using laboratory simulated strip casting

Xiong

Saleh

Kostryzhev

et al. 2017

Journal of Alloys and Compounds

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Analysis of ferrite grain growth mechanisms during γ−α transformation in a niobium alloyed steel using EBSD

Cited by 24 publications

References 0 publications

Microstructure-Mechanical Properties Relationships for Complex Microstructures in High Strength Steels

Microstructure-Mechanical Properties Relationships for Complex Microstructures in High Strength Steels

Factors Limiting the Achievable Ferrite Grain Refinement in Hot Worked Microalloyed Steels

Strain-induced ferrite formation and its effect on mechanical properties of a dual phase steel produced using laboratory simulated strip casting

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