Hardness loss and microstructure evolution of 90% hot-rolled pure tungsten at 1200-1350°C

Ming Yu, Kang Wang, Xiang Zan, Wolfgang Pantleon, Laima Luo, Xiaoyong Zhu, Yucheng Wu

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Abstract

Tungsten is a promising plasma-facing material because of its low sputtering yield, high melting point and high thermal conductivity. The hardness loss and microstructure evolution of pure tungsten hot-rolled to 90% thickness reduction is investigated by isothermal annealing at temperature range of 1200-1350°C. Changes in the mechanical properties caused by recovery and recrystallization during heat treatment are detected by Vickers hardness measurements. Additionally, the microstructural evolution is analyzed with light optical microscopy and X-ray diffraction. The results indicate that the hardness evolution can be divided into two stages: recovery and recrystallization. Recrystallization of W90 in the temperature range of 1200 to1350°C is governed by the same activation energy as grain boundary diffusion. The average recrystallized grain size is larger for lower annealing temperatures.
Original languageEnglish
JournalFusion Engineering and Design
Volume125
Pages (from-to)531-536
ISSN0920-3796
DOIs
Publication statusPublished - 2017

Keywords

  • Microscopy
  • Recrystallization
  • Tungsten
  • Vickers hardness
  • X-ray diffraction

Cite this

Yu, Ming ; Wang, Kang ; Zan, Xiang ; Pantleon, Wolfgang ; Luo, Laima ; Zhu, Xiaoyong ; Wu, Yucheng. / Hardness loss and microstructure evolution of 90% hot-rolled pure tungsten at 1200-1350°C. In: Fusion Engineering and Design. 2017 ; Vol. 125. pp. 531-536.
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abstract = "Tungsten is a promising plasma-facing material because of its low sputtering yield, high melting point and high thermal conductivity. The hardness loss and microstructure evolution of pure tungsten hot-rolled to 90{\%} thickness reduction is investigated by isothermal annealing at temperature range of 1200-1350°C. Changes in the mechanical properties caused by recovery and recrystallization during heat treatment are detected by Vickers hardness measurements. Additionally, the microstructural evolution is analyzed with light optical microscopy and X-ray diffraction. The results indicate that the hardness evolution can be divided into two stages: recovery and recrystallization. Recrystallization of W90 in the temperature range of 1200 to1350°C is governed by the same activation energy as grain boundary diffusion. The average recrystallized grain size is larger for lower annealing temperatures.",
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author = "Ming Yu and Kang Wang and Xiang Zan and Wolfgang Pantleon and Laima Luo and Xiaoyong Zhu and Yucheng Wu",
year = "2017",
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Hardness loss and microstructure evolution of 90% hot-rolled pure tungsten at 1200-1350°C. / Yu, Ming; Wang, Kang; Zan, Xiang; Pantleon, Wolfgang; Luo, Laima; Zhu, Xiaoyong; Wu, Yucheng.

In: Fusion Engineering and Design, Vol. 125, 2017, p. 531-536.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Hardness loss and microstructure evolution of 90% hot-rolled pure tungsten at 1200-1350°C

AU - Yu, Ming

AU - Wang, Kang

AU - Zan, Xiang

AU - Pantleon, Wolfgang

AU - Luo, Laima

AU - Zhu, Xiaoyong

AU - Wu, Yucheng

PY - 2017

Y1 - 2017

N2 - Tungsten is a promising plasma-facing material because of its low sputtering yield, high melting point and high thermal conductivity. The hardness loss and microstructure evolution of pure tungsten hot-rolled to 90% thickness reduction is investigated by isothermal annealing at temperature range of 1200-1350°C. Changes in the mechanical properties caused by recovery and recrystallization during heat treatment are detected by Vickers hardness measurements. Additionally, the microstructural evolution is analyzed with light optical microscopy and X-ray diffraction. The results indicate that the hardness evolution can be divided into two stages: recovery and recrystallization. Recrystallization of W90 in the temperature range of 1200 to1350°C is governed by the same activation energy as grain boundary diffusion. The average recrystallized grain size is larger for lower annealing temperatures.

AB - Tungsten is a promising plasma-facing material because of its low sputtering yield, high melting point and high thermal conductivity. The hardness loss and microstructure evolution of pure tungsten hot-rolled to 90% thickness reduction is investigated by isothermal annealing at temperature range of 1200-1350°C. Changes in the mechanical properties caused by recovery and recrystallization during heat treatment are detected by Vickers hardness measurements. Additionally, the microstructural evolution is analyzed with light optical microscopy and X-ray diffraction. The results indicate that the hardness evolution can be divided into two stages: recovery and recrystallization. Recrystallization of W90 in the temperature range of 1200 to1350°C is governed by the same activation energy as grain boundary diffusion. The average recrystallized grain size is larger for lower annealing temperatures.

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DO - 10.1016/j.fusengdes.2017.05.072

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