Nucleation of Secondary Recrystallization in Ultra Low Carbon Steel

Verbeken, Kim; Kestens, Léo

doi:10.4028/www.scientific.net/msf.495-497.1189

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…Here, it was found, by contrast, that the nucleation stage of secondary recrystallization in ULC steel has very specific and important properties. The very inhomogeneous growth rate of a secondary recrystallization nucleus was correlated with a specific nucleation mechanism [22]. This mechanism involves the disappearance of low angle grain boundaries, which appear to be of key importance for the onset of local grain coalescence between grains that are only separated by low angle grain boundaries, cf.…”

Section: Tolerancementioning

confidence: 99%

Orientation Selection in ULC Steel during Thermally Activated Phenomena Induced by Cold Deformation

Verbeken

Kestens

2007

MSF

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The scope of this work was to study the physical metallurgical behaviour of the microstructure and the texture of ultra low carbon (ULC) steel during cold rolling and subsequent thermally activated phenomena. It was the intention to contribute to the scientific search for the answer to many open questions raised in recent literature. The powerful tool of quantitative texture analysis, together with modern measurement equipment was used for this purpose. At first, a ULC steel was cold rolled to two different rolling reductions and the local strain heterogeneities after the cold rolling were studied. Secondly, crystallographic orientation selection during primary recrystallization was considered both for cold rolled ULC steel and for a Fe-2.8%Si single crystal. The latter was a re-evaluation of the historic growth selection experiment by Ibe and Lücke. Finally, secondary recrystallization in ULC steels was evaluated in terms of oriented nucleation and selective growth.

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Section: Tolerancementioning

confidence: 99%

Orientation Selection in ULC Steel during Thermally Activated Phenomena Induced by Cold Deformation

Verbeken

Kestens

2007

MSF

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“…Desta forma, é possível uma acentuada interação entre o grão Goss primário e as discordâncias, o que garante a eles maior capacidade de migrar e crescer mais rapidamente que os demais grãos. É sugerido um mecanismo para a nucleação do grão anormal a partir de uma microestrutura completamente formada por grãos primários em um aço ultrabaixo carbonoKESTENS, 2005;KESTENS, 2007). O mecanismo proposto envolve a rotação e a coalescência dos grãos provenientes da recristalização primária circundados por diferentes contornos de baixo ângulo e que se encontram próximos entre si até que estes formem um único grão com tamanho maior do que a média.…”

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Avaliação da estabilidade microestrutural do aço ferrítico-martensítico Eurofer-97 recozido isotermicamente até 1350°C

Oliveira¹

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Clean, safe, and renewable energy sources such as nuclear fusion comprise important technological challenges, including research, characterization and manufacture of advanced materials for future fusion reactors. Modified ferritic-martensitic steels with reduced radioactive activity (RAFM), especially Eurofer-97 steel, are among worldwide references in the nuclear field for their unique properties. The scope of this Thesis is to evaluate the microstructural (thermal) stability in ferritic-martensitic Eurofer-97 after annealing within a wide range of temperatures. Themodinamic calculations as well as dilatometric tests were used to determine the main phase transformation temperatures. The microstructural stability of this steel was followed by isothermal annealing between 200 and 1350°C after cold rolling to 40, 70, 80 and 90% reductions in thickness. The mechanical stability in the Eurofer-97 was assessed by Vickers microhardness measurements. Representative samples for each metallurgical condition were characterized by scanning electron microscopy, transmission electron microscopy, atom probe tomography, and DC-magnetization tests. Both texture and microtexture were evaluated by X-ray diffraction and electron backscattered diffraction (EBSD) techniques. Recovery, primary recrystallization, and abnormal grain growth (secondary recrystallization) processes have been observed at temperatures below 800°C. The amount of abnormally grown grains depends on the amount of previous cold rolling. The hypothesis for the most probable mechanism responsible for abnormal grain growth is based on the advantage size acquired by nuclei with misorientations above 45º surrounding their neighboring grains, even in regions where primary recrystallization was incomplete. The texture developed after abnormal grain growth has components belonging to α-and γ-fibers with predominance of {111}<110>, {111}<112>, {100}<110> e {110}<001> components. The martensite transformation takes place when this steel is annealed above 800°C causing an increase of hardness, significant changes in microstructure, and texture weakening. The martensitic sructure depends very much on both austenitization temperature and initial austenitic grain size. The results of chemical analyses of stable particles present in samples annealed below 800 o C were used to validate the thermodynamic calculations provided by Thermo-Calc.

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Effect of Starting As-cast Structure on the Microstructure–Texture Evolution During Subsequent Processing and Finally Ridging Behavior of Ferritic Stainless Steel

Modak

Patra

Mitra

et al. 2018

Metall Mater Trans A

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Nucleation of Secondary Recrystallization in Ultra Low Carbon Steel

Cited by 6 publications

References 16 publications

Orientation Selection in ULC Steel during Thermally Activated Phenomena Induced by Cold Deformation

Orientation Selection in ULC Steel during Thermally Activated Phenomena Induced by Cold Deformation

Avaliação da estabilidade microestrutural do aço ferrítico-martensítico Eurofer-97 recozido isotermicamente até 1350°C

Effect of Starting As-cast Structure on the Microstructure–Texture Evolution During Subsequent Processing and Finally Ridging Behavior of Ferritic Stainless Steel

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