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Determination of interface toughness of functionally graded tungsten/EUROFER multilayer at 550 °C by analytical and experimental methods.

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Title: Determination of interface toughness of functionally graded tungsten/EUROFER multilayer at 550 °C by analytical and experimental methods.
Authors: Qu, D.1 dandanqu@imech.ac.cn, Gaganidze, E.1, Vaßen, R.1, Aktaa, J.1
Source: Engineering Fracture Mechanics. Oct2018, Vol. 202, p487-499. 13p.
Subjects: Functionally gradient materials, Tungsten, Bending strength, Microstructure, Crack propagation
Abstract: Highlights • We evaluated interface toughness of functionally graded multilayer. • We performed three and four-point bending tests on pre-cracked specimens at 550 °C. • The energy release rate was assessed analytically and experimentally. • Relationship between microstructure and energy release rate of interfacial crack propagation was reported. Abstract As armor coating, functionally graded (FG) tungsten/EUROFER multilayer was sprayed on EUROFER substrate for First Wall application in fusion field. Interface toughness between FG tungsten/EUROFER multilayer and EUROFER substrate was studied innovatively by a simple method based on the beam theory in this paper. To quantify interface toughness, the energy release rate was assessed by performing three and four-point bending tests on pre-cracked specimens at 550 °C and under high vacuum. The energy release rate during propagating of interfacial crack was determined to be 258 J/m2 and 225 J/m2 analytically and experimentally for samples with 3 and 5 layers as FG-layer, respectively, which were calculated based on multi bending tests. Cross-section and fracture microstructure show a vast of plasticity in FG-layer, particularly in FG-layer with a higher volume ratio of EUROFER. Interfacial fracture microstructure indicates interface adhesion consists of mechanical interlocking and metallurgical bonding. [ABSTRACT FROM AUTHOR]
Copyright of Engineering Fracture Mechanics is the property of Pergamon Press - An Imprint of Elsevier Science 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: Determination of interface toughness of functionally graded tungsten/EUROFER multilayer at 550 °C by analytical and experimental methods.
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  Data: <searchLink fieldCode="AR" term="%22Qu%2C+D%2E%22">Qu, D.</searchLink><relatesTo>1</relatesTo><i> dandanqu@imech.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Gaganidze%2C+E%2E%22">Gaganidze, E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Vaßen%2C+R%2E%22">Vaßen, R.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Aktaa%2C+J%2E%22">Aktaa, J.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Engineering+Fracture+Mechanics%22">Engineering Fracture Mechanics</searchLink>. Oct2018, Vol. 202, p487-499. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Functionally+gradient+materials%22">Functionally gradient materials</searchLink><br /><searchLink fieldCode="DE" term="%22Tungsten%22">Tungsten</searchLink><br /><searchLink fieldCode="DE" term="%22Bending+strength%22">Bending strength</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Crack+propagation%22">Crack propagation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Highlights • We evaluated interface toughness of functionally graded multilayer. • We performed three and four-point bending tests on pre-cracked specimens at 550 °C. • The energy release rate was assessed analytically and experimentally. • Relationship between microstructure and energy release rate of interfacial crack propagation was reported. Abstract As armor coating, functionally graded (FG) tungsten/EUROFER multilayer was sprayed on EUROFER substrate for First Wall application in fusion field. Interface toughness between FG tungsten/EUROFER multilayer and EUROFER substrate was studied innovatively by a simple method based on the beam theory in this paper. To quantify interface toughness, the energy release rate was assessed by performing three and four-point bending tests on pre-cracked specimens at 550 °C and under high vacuum. The energy release rate during propagating of interfacial crack was determined to be 258 J/m2 and 225 J/m2 analytically and experimentally for samples with 3 and 5 layers as FG-layer, respectively, which were calculated based on multi bending tests. Cross-section and fracture microstructure show a vast of plasticity in FG-layer, particularly in FG-layer with a higher volume ratio of EUROFER. Interfacial fracture microstructure indicates interface adhesion consists of mechanical interlocking and metallurgical bonding. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Engineering Fracture Mechanics is the property of Pergamon Press - An Imprint of Elsevier Science 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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        Value: 10.1016/j.engfracmech.2018.09.016
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      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 487
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      – SubjectFull: Functionally gradient materials
        Type: general
      – SubjectFull: Tungsten
        Type: general
      – SubjectFull: Bending strength
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      – SubjectFull: Microstructure
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      – SubjectFull: Crack propagation
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              Text: Oct2018
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              Y: 2018
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