A Quantitative Characterization of Austenite Microstructure after Deformation in Nonrecrystallization Region and Its Influence on Ferrite Microstructure after Transformation.

Kvačkaj, Tibor; Mamuzić, Ilija

doi:10.2355/isijinternational.38.1270

Cited by 28 publications

(19 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result, the austenite grains became somewhat large (2 À30 mm), as shown in Fig. 3b, and this finally resulted in somewhat large ferrite grains ( $ 7 mm) ( Table 1); ferrite grain size is closely related to austenite grain size because the austenite grain boundaries serve as the nucleation sites for g-a transformation during the coiling process [20][21][22][23]. On the other hand, for the rolling condition of the FRT 880 1C which corresponds to the rolling at g non-recrystallization region, the deformation applied during the rolling process cannot be accommodated completely unlike the case of FRT 1050 1C in which the deformation applied can be accommodated via the recrystallization of austenite grains.…”

Section: Microstructurementioning

confidence: 89%

Development of Ti and Mo micro-alloyed hot-rolled high strength sheet steel by controlling thermomechanical controlled processing schedule

Kim

Song

Seo

et al. 2013

Materials Science and Engineering: A

104

View full text Add to dashboard Cite

Section: Microstructurementioning

confidence: 89%

Development of Ti and Mo micro-alloyed hot-rolled high strength sheet steel by controlling thermomechanical controlled processing schedule

Kim

Song

Seo

et al. 2013

Materials Science and Engineering: A

104

View full text Add to dashboard Cite

“…[1] After austenite deformation below the T 5pct , several changes in austenite state are made, including grain shape, texture, density of substructures, annealing twin boundaries (changed into normal high-angle grain boundaries (HAGBs) during deformation), and bulging of austenite grain boundaries. [2] This austenite conditioning strongly affects the transformed microstructure and, hence, the final mechanical properties. [3,4] For thermomechanically processed microalloyed steels, air cooling often leads to a ferrite-pearlite microstructure with mechanical properties commonly below the X-70 grade.…”

Section: Introductionmentioning

confidence: 99%

Effect of Austenite Deformation on the Microstructure Evolution and Grain Refinement Under Accelerated Cooling Conditions

Zhao

Palmiere

2017

Metall and Mat Trans A

View full text Add to dashboard Cite

Although there has been much research regarding the effect of austenite deformation on accelerated cooled microstructures in microalloyed steels, there is still a lack of accurate data on boundary densities and effective grain sizes. Previous results observed from optical micrographs are not accurate enough, because, for displacive transformation products, a substantial part of the boundaries have disorientation angles below 15 deg. Therefore, in this research, a niobium microalloyed steel was used and electron backscattering diffraction mappings were performed on all of the transformed microstructures to obtain accurate results on boundary densities and grain refinement. It was found that with strain rising from 0 to 0.5, a transition from bainitic ferrite to acicular ferrite occurs and the effective grain size reduces from 5.7 to 3.1 lm. When further increasing strain from 0.5 to 0.7, dynamic recrystallization was triggered and postdynamic softening occurred during the accelerated cooling, leading to an inhomogeneous and coarse transformed microstructure. In the entire strain range, the density changes of boundaries with different disorientation angles are distinct, due to different boundary formation mechanisms. Finally, the controversial influence of austenite deformation on effective grain size of low-temperature transformation products was argued to be related to the differences in transformation conditions and final microstructures.

show abstract

“…The hard martensite phase under straining can stimulate the formation of new mobile dislocations in a soft ferrite matrix and, by means of this, decrease the yield strength. [28] Furthermore, the martensite was not uniformly distributed within the ferrite, so giving rise to a gradual deviation from elastic deformation. Hence, it is proposed that all these features decrease the yield strength.…”

Section: B Microstructure-property Relationshipmentioning

confidence: 99%

Effect of deformation schedule on the microstructure and mechanical properties of a thermomechanically processed C-Mn-Si transformation-induced plasticity steel

Timokhina

Hodgson

Pereloma

2003

Metall Mater Trans A

View full text Add to dashboard Cite

Thermomechanical processing simulations were performed using a hot-torsion machine, in order to develop a comprehensive understanding of the effect of severe deformation in the recrystallized and nonrecrystallized austenite regions on the microstructural evolution and mechanical properties of the 0.2 wt pct C-1.55 wt pct Mn-1.5 wt pct Si transformation-induced plasticity (TRIP) steel. The deformation schedule affected all constituents (polygonal ferrite, bainite in different morphologies, retained austenite, and martensite) of the multiphased TRIP steel microstructure. The complex relationships between the volume fraction of the retained austenite, the morphology and distribution of all phases present in the microstructure, and the mechanical properties of TRIP steel were revealed. The bainite morphology had a more pronounced effect on the mechanical behavior than the refinement of the microstructure. The improvement of the mechanical properties of TRIP steel was achieved by variation of the volume fraction of the retained austenite rather than the overall refinement of the microstructure.

show abstract

A Quantitative Characterization of Austenite Microstructure after Deformation in Nonrecrystallization Region and Its Influence on Ferrite Microstructure after Transformation.

Cited by 28 publications

References 1 publication

Development of Ti and Mo micro-alloyed hot-rolled high strength sheet steel by controlling thermomechanical controlled processing schedule

Development of Ti and Mo micro-alloyed hot-rolled high strength sheet steel by controlling thermomechanical controlled processing schedule

Effect of Austenite Deformation on the Microstructure Evolution and Grain Refinement Under Accelerated Cooling Conditions

Effect of deformation schedule on the microstructure and mechanical properties of a thermomechanically processed C-Mn-Si transformation-induced plasticity steel

Contact Info

Product

Resources

About