Influence of the temperature of high pressure torsion deformation on the recrystallization kinetics of iron with a submicrocrystalline structure

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The kinetics of recrystallization of pure iron deformed by high pressure torsion at 20 and 250°C has been studied in the course of annealing at 450°C. The change in grain size upon annealing at 450°C does not obey the law of normal grain growth, either in iron with an SMC structure formed at 20°C or in iron with a dynamically recrystallized structure formed at 250°C. This is because new thermally activated recrystallization centers appear upon annealing. The study has also established the influence of deformation temperature on the annealing texture. Similarly, after deformation at 20°C, a sharper texture is formed with a predominance of two components {110} <111> and {110} <001>, and after deformation at 250°C, with a predominance of three components {110} <111>, {110} <001> and {112} <111>, is formed.

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L. Voronova

Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: highpress@imp.uran.ru
俄罗斯联邦, 620108, Ekaterinburg

М. Degtyarev

Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: highpress@imp.uran.ru
俄罗斯联邦, 620108, Ekaterinburg

T. Chashchukhina

Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: highpress@imp.uran.ru
俄罗斯联邦, 620108, Ekaterinburg

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2. Fig. 1. The structure of iron after deformation at 250 °C (a, b) and 20°C (c, d); a, c – light–field images; b, d - dark-field images in the reflex type {110}. PEM.

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3. Fig. 2. Hardness change (H) as a result of annealing at 450 ° C of iron deformed at 20 (O) and 250 °C (■).

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4. Fig. 3. The structure of iron after deformation at 250 °C and annealing at 450 ° C, 15 min (a, b) and histograms of grain size distribution (c) and boundaries at the angles of disorientation (d); a – light–field image, TEM; b - orientation map in OPF colors; (g–d) – RAM.

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5. Fig. 4. The structure of iron after deformation at 20 °C and annealing at 450 °C, 15 min (a, b) and histograms of grain size distribution (c) and boundaries at the misorientation angles, a solid line in the background shows the distribution characteristic of a random ensemble of grains (d); a – light–field image, PEM, b - contrast map of Kikuchi paintings (reconstructed image obtained based on the analysis of the quality of the diffraction pattern), (g–d) – RAM.

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6. Fig. 5. The structure of iron (a–c) and histograms of grain size distribution (d) and boundaries at the angles of disorientation (e) after deformation at 250 °C and annealing at 450 ° C, 30 min; a, b – PEM, b – dark-field image in a reflex type {110}, c – contrast map of Kikuchi paintings (restored image); (c–e) – REM.

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7. Fig. 6. Dependences of the average (■, ●) and maximum grain size (▲, ▲) on the duration of annealing of iron deformed at 250 (a) and 20 °C (b). Filled icons – SEM, transparent icons (□, ○) – the size of the structural elements averaged according to TEM data. In Fig. 6b, the dotted line for comparison shows the dependence for iron deformed at 20 ° C and annealed at 300 °From [7].

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8. Rhys. 7. The structure of the glands (a, b-orientation maps in OPF colors) and histograms are distributed by grain size (b, d) then deformations and annealing at 450 °C; (a, b) deformations at 20°C, annealing for 1 hour; (c, d) deformations at 250 °C, annealing for 4 hours, REM.

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9. Reece. 8. Obratnye polyusny figure [001], poluchennye metodom YAA s JELEZA, deformirovannogo PRI 20 (a–G) I 250 Yaa s (D–Z) I otojjennogo PRI 450 Yaa s V techenie: a – 15 min; B, E – 30 min; v – 1 Ch; J – 4 CH; G, z – 16 ch; d – bez otjiga.

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10. Rhys. 9. Standard sections of FRO showing the position of component textures of BCC metals deformed by the “pressure shift” method [29] (a) and experimentally obtained by the EBSD method sections of FRO glands deformed at 20 (b-d) and 250 °C (D–z) and annealed at 450°C during: b, e – 15 min; c, w – 30 min g, w – 1 h; D – without annealing.

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11. Fig. 10. Change in the proportion of the area occupied by grains with an orientation of {110} during annealing at 450 ° C of iron deformed at 20 ° C (O) and 250 °C (■).

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