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Effect of Rolling Speed on Microstructural and Microtextural Evolution of Nb Tubes during Caliber-Rolling Process

Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology, Incheon 21999, Korea
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Metals 2019, 9(5), 500; https://doi.org/10.3390/met9050500
Received: 9 April 2019 / Revised: 26 April 2019 / Accepted: 27 April 2019 / Published: 29 April 2019
(This article belongs to the Special Issue Processing-Structure-Property Relationships in Metals)
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Abstract

This study investigated the fabrication of Nb tubes via the caliber-rolling process at various rolling speeds from 1.4 m/min to 9.9 m/min at ambient temperature, and the effect of the caliber-rolling speed on the microstructural and microtextural evolution of the Nb tubes. The caliber-rolling process affected the grain refinement when the Nb tube had a higher fraction of low angle grain boundaries. However, the grain size was identical regardless of the rolling speed. The dislocation density of the Nb tubes increased with the caliber-rolling speed according to the Orowan equation. The reduction of intensity for the <111> fiber texture and the development of the <112> fiber texture with the increase of the strain rate are considered to have decreased the internal energy by increasing the fraction of the low-energy Σ3 boundaries. View Full-Text
Keywords: Nb tube; caliber-rolling; grain boundaries; texture; electron backscatter diffraction Nb tube; caliber-rolling; grain boundaries; texture; electron backscatter diffraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lee, J.; Jeong, H. Effect of Rolling Speed on Microstructural and Microtextural Evolution of Nb Tubes during Caliber-Rolling Process. Metals 2019, 9, 500.

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