Effect of Deformation in Controlled Rolling on Ferrite Nucleation

Khlestov, V. M.; Konopleva, E. V.; McQueen, H.J.

doi:10.1179/000844301794388425

Cited by 11 publications

(4 citation statements)

References 5 publications

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“…At lower temperatures small amounts of new nuclei were observed inside the austenite grains in the shear bands or twins (Fig. 7b, point 3) as it was observed also by Khlestov et al [11]. With decreasing quenching temperature the ferrite growth is clearly observed in the microstructure as it is shown in Fig.…”

Section: Resultssupporting

confidence: 78%

Grain Growth after Intercritical Rolling

Petrov

Kestens

Verbeken

et al. 2004

MSF

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Abstract. The distribution of the characteristic texture components between the ferrite grains of different size classes has been studied in a steel with 0.082%C, 1.54% Mn, 0.35% Si, 0.055%Nb and 0.078%V after different rolling schedules with a final rolling temperature above or below Ar 3 . Microstructures and textures were characterized by means of optical microscopy and orientation microscopy. A strong grain refining effect together with a bimodal grain size distribution was observed in the steel both after final rolling in the intercritical region or in the austenite region, close to the Ar 3 d temperature. The differences in grain size were interpreted on the basis of three potentially acting mechanisms: (i) transformation-induced recrystallization, (ii) increased mobility of specific grain boundaries and (iii) fast nucleation of ferrite grains on specific sites of the parent austenite microstructure. The experimental data clearly favoured the third of these assumptions as the responsible mechanism for the observed bimodal grain size distributions.

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Section: Resultssupporting

confidence: 78%

Grain Growth after Intercritical Rolling

Petrov

Kestens

Verbeken

et al. 2004

MSF

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“…[1][2][3][4][5][6] The most significant feature of the phenomenon is the great increase in initial nucleation rates associated with very fine nuclei that are generated through the activation of the elongated austenite boundaries by dense dislocation walls. 7 The effect appears to be relatively independent of the metallic alloying content, being maximum at 0 . 04%C and almost unvarying above 0 .…”

Section: Introductionmentioning

confidence: 95%

Transformation of austenite remaining after intercritical rolling to ferrite

Khlestov¹,

Konopleva²,

McQueen³

2006

Materials Science and Technology

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The impact of austenite deformation in the intercritical range on the rate of transformation in continuous cooling to ferrite, pearlite, bainite or martensite has been studied. The austenite associated with the rolled ferrite is much higher in carbon content, which does not influence the pearlite transformation but retards bainite and martensite. Furthermore, in comparison with rolling of stable austenite the increased strain hardening of the intercritically cooled austenite accelerates the formation of ferrite and pearlite (z10-30uC) and refines them but retards the bainite and martensite transformations (220-40uC). At the intermediate cooling rate near 16 K s 21 , these several influences combined with near doubling of the ferrite production give rise to the suppression of bainite formation and to maximum increased delay of martensite start.

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“…Structural refinement can be enhanced in the course of shaping by changing from one phase to another or by manipulating the duplex structure [3,31,32]. Steels have by far the widest selection of TMP, such as controlled rolling for ferrite grain refining and carry-over of substructures into bainite or martensite to name a few; each of these with many options depends on the solute or precipitation alloying [1,18,29,33].…”

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confidence: 99%

“…Steels have by far the widest selection of TMP, such as controlled rolling for ferrite grain refining and carry-over of substructures into bainite or martensite to name a few; each of these with many options depends on the solute or precipitation alloying [1,18,29,33]. Dislocation substructures play a significant role in nucleation of the new phase or are carried through a martensitic type, as well as nucleating particles [30,31,34]. Fundamental aspects of these possibilities are clarified in…”

mentioning

confidence: 99%