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Microstructure and tensile properties of tungsten at elevated temperatures

Shen, Tielong; Dai, Yong and Lee, Yong Joong LU (2016) In Journal of Nuclear Materials 468. p.348-354
Abstract
In order to support the development of the 5 MW spallation target for the European Spallation Source, the effect of fabrication process on microstructure, ductile-to-brittle transition temperature (DBTT), tensile and fracture behaviour of powder-metallurgy pure tungsten materials has been investigated. A hot-rolled (HR) tungsten piece of 12 mm thickness and a hot-forged (HF) piece of about 80 mm thickness were used to simulate the thin and thick blocks in the target. The two tungsten pieces were characterized with metallography analysis, hardness measurement and tensile testing. The HR piece exhibits an anisotropic grain structure with an average size of about 330 x 140 x 40 mu m in rolling, long transverse and short transverse (thickness)... (More)
In order to support the development of the 5 MW spallation target for the European Spallation Source, the effect of fabrication process on microstructure, ductile-to-brittle transition temperature (DBTT), tensile and fracture behaviour of powder-metallurgy pure tungsten materials has been investigated. A hot-rolled (HR) tungsten piece of 12 mm thickness and a hot-forged (HF) piece of about 80 mm thickness were used to simulate the thin and thick blocks in the target. The two tungsten pieces were characterized with metallography analysis, hardness measurement and tensile testing. The HR piece exhibits an anisotropic grain structure with an average size of about 330 x 140 x 40 mu m in rolling, long transverse and short transverse (thickness) directions. The HF piece possesses a bimodal grain structure with about 310 x 170 x 70 mu m grain size in deformed part and about 25 mu m sized grains remained from sintering process. Hardness (HV0.2) of the HR piece is slightly greater than that of the HF one. The ductility of the HR tungsten specimens is greater than that of the HF tungsten. For the HF tungsten piece, specimens with small grains in gauge section manifest lower ductility but higher strength. The DBTT evaluated from the tensile results is 250-300 degrees C for the HR tungsten and about 350 degrees C for the HF tungsten. (c) 2015 Elsevier B.V. All rights reserved. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
Spallation neutron source, Spallation target, Tungsten, Tensile, properties, Metallography
in
Journal of Nuclear Materials
volume
468
pages
348 - 354
publisher
Elsevier
external identifiers
  • wos:000367761700044
  • scopus:84955307806
ISSN
0022-3115
DOI
10.1016/j.jnucmat.2015.09.057
language
English
LU publication?
yes
id
12721613-a992-408b-95e0-99d31599c6b5 (old id 8747989)
date added to LUP
2016-02-23 09:42:29
date last changed
2017-01-01 03:18:46
@article{12721613-a992-408b-95e0-99d31599c6b5,
  abstract     = {In order to support the development of the 5 MW spallation target for the European Spallation Source, the effect of fabrication process on microstructure, ductile-to-brittle transition temperature (DBTT), tensile and fracture behaviour of powder-metallurgy pure tungsten materials has been investigated. A hot-rolled (HR) tungsten piece of 12 mm thickness and a hot-forged (HF) piece of about 80 mm thickness were used to simulate the thin and thick blocks in the target. The two tungsten pieces were characterized with metallography analysis, hardness measurement and tensile testing. The HR piece exhibits an anisotropic grain structure with an average size of about 330 x 140 x 40 mu m in rolling, long transverse and short transverse (thickness) directions. The HF piece possesses a bimodal grain structure with about 310 x 170 x 70 mu m grain size in deformed part and about 25 mu m sized grains remained from sintering process. Hardness (HV0.2) of the HR piece is slightly greater than that of the HF one. The ductility of the HR tungsten specimens is greater than that of the HF tungsten. For the HF tungsten piece, specimens with small grains in gauge section manifest lower ductility but higher strength. The DBTT evaluated from the tensile results is 250-300 degrees C for the HR tungsten and about 350 degrees C for the HF tungsten. (c) 2015 Elsevier B.V. All rights reserved.},
  author       = {Shen, Tielong and Dai, Yong and Lee, Yong Joong},
  issn         = {0022-3115},
  keyword      = {Spallation neutron source,Spallation target,Tungsten,Tensile,properties,Metallography},
  language     = {eng},
  pages        = {348--354},
  publisher    = {Elsevier},
  series       = {Journal of Nuclear Materials},
  title        = {Microstructure and tensile properties of tungsten at elevated temperatures},
  url          = {http://dx.doi.org/10.1016/j.jnucmat.2015.09.057},
  volume       = {468},
  year         = {2016},
}