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High-Energy X-ray Dynamics of the Recovery and Recrystallization Behaviors of Steels Subjected to Uniaxial Hot Compression and Isothermal Annealing.

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Title: High-Energy X-ray Dynamics of the Recovery and Recrystallization Behaviors of Steels Subjected to Uniaxial Hot Compression and Isothermal Annealing.
Authors: Yonemura, Mitsuharu1 (AUTHOR) yonemura.4k8.mitsuharu@jp.nipponsteel.com, Sugano, Satoshi1 (AUTHOR), Yamaguchi, Itsuki2 (AUTHOR), Toyokawa, Hidenori3 (AUTHOR), Saito, Hiroyuki4 (AUTHOR)
Source: Metallurgical & Materials Transactions. Part A. Apr2025, Vol. 56 Issue 4, p1193-1204. 12p.
Subjects: Isothermal compression, Dislocation density, Recrystallization (Metallurgy), Mild steel, X-ray diffraction
Abstract: In situ high-energy X-ray diffraction (XRD) was used to examine the microstructural changes that occur during uniaxial hot compression and isothermal annealing. This method provided valuable insights into the recovery and recrystallization behaviors that occur during the manufacturing process. The γ-phase dislocation density changes in the Ni–30 mass pct Fe austenitic alloy well aligned with those in Fe−0.2 mass pct C martensitic steel during hot compression and isothermal annealing. A comparison between the in situ and ex situ XRD data of Fe−0.2 mass pct C and Ni–30 mass pct Fe, respectively, revealed a strong correlation between the γ-phase dislocation density variation behaviors of these materials. Despite the microstructure mainly consisting of coarse, unrecrystallized grains with a high dislocation density, dynamic recrystallization occurred to some extent at 750 °C owing to the work-hardening rate. The recrystallization rate varied with isothermal annealing time, enabling classification of the dislocation density according to static recovery and recovery/recrystallization. The recrystallization activation energy, estimated from grain orientation spread changes, was approximately 280 kJ/mol, which was similar to that of pure Ni metal. These results provide comprehensive insights into the recovery and recrystallization behaviors in the high-temperature γ-phase of low-carbon steels. [ABSTRACT FROM AUTHOR]
Copyright of Metallurgical & Materials Transactions. Part A is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: High-Energy X-ray Dynamics of the Recovery and Recrystallization Behaviors of Steels Subjected to Uniaxial Hot Compression and Isothermal Annealing.
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  Data: <searchLink fieldCode="AR" term="%22Yonemura%2C+Mitsuharu%22">Yonemura, Mitsuharu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yonemura.4k8.mitsuharu@jp.nipponsteel.com</i><br /><searchLink fieldCode="AR" term="%22Sugano%2C+Satoshi%22">Sugano, Satoshi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yamaguchi%2C+Itsuki%22">Yamaguchi, Itsuki</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Toyokawa%2C+Hidenori%22">Toyokawa, Hidenori</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Saito%2C+Hiroyuki%22">Saito, Hiroyuki</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Metallurgical+%26+Materials+Transactions%2E+Part+A%22">Metallurgical & Materials Transactions. Part A</searchLink>. Apr2025, Vol. 56 Issue 4, p1193-1204. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Isothermal+compression%22">Isothermal compression</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocation+density%22">Dislocation density</searchLink><br /><searchLink fieldCode="DE" term="%22Recrystallization+%28Metallurgy%29%22">Recrystallization (Metallurgy)</searchLink><br /><searchLink fieldCode="DE" term="%22Mild+steel%22">Mild steel</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink>
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  Data: In situ high-energy X-ray diffraction (XRD) was used to examine the microstructural changes that occur during uniaxial hot compression and isothermal annealing. This method provided valuable insights into the recovery and recrystallization behaviors that occur during the manufacturing process. The γ-phase dislocation density changes in the Ni–30 mass pct Fe austenitic alloy well aligned with those in Fe−0.2 mass pct C martensitic steel during hot compression and isothermal annealing. A comparison between the in situ and ex situ XRD data of Fe−0.2 mass pct C and Ni–30 mass pct Fe, respectively, revealed a strong correlation between the γ-phase dislocation density variation behaviors of these materials. Despite the microstructure mainly consisting of coarse, unrecrystallized grains with a high dislocation density, dynamic recrystallization occurred to some extent at 750 °C owing to the work-hardening rate. The recrystallization rate varied with isothermal annealing time, enabling classification of the dislocation density according to static recovery and recovery/recrystallization. The recrystallization activation energy, estimated from grain orientation spread changes, was approximately 280 kJ/mol, which was similar to that of pure Ni metal. These results provide comprehensive insights into the recovery and recrystallization behaviors in the high-temperature γ-phase of low-carbon steels. [ABSTRACT FROM AUTHOR]
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  Label:
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  Data: <i>Copyright of Metallurgical & Materials Transactions. Part A is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: Apr2025
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