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Open AccessArticle

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)
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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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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