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Enhancement of hardness, modulus and fracture toughness of the tetragonal (Fe,Cr)2B and orthorhombic (Cr,Fe)2B phases with addition of Cr.

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Title: Enhancement of hardness, modulus and fracture toughness of the tetragonal (Fe,Cr)2B and orthorhombic (Cr,Fe)2B phases with addition of Cr.
Authors: Lentz, Jonathan1 Lentz@wtech.rub.de, Röttger, Arne1, Großwendt, Felix1, Theisen, Werner1
Source: Materials & Design. Oct2018, Vol. 156, p113-124. 12p.
Subjects: Hardness, Fracture toughness, Elastic modulus, Borides, Nanoindentation tests, Orthorhombic crystal system
Abstract: This study analyzes the influence of Cr content on hardness H, elastic modulus E and fracture toughness K IC of the M 2 B boride by means of nanoindentation experiments. Additionally, properties of the Fe 3 (C,B) phase are determined. Samples of the M 2 B phase are casted and microstructurally characterized by means of scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. At a Cr content higher than 14.7 atom% the M 2 B phase transforms from tetragonal into orthorhombic structure. The tetragonal M 2 B type possesses an optimum of H (21 ± 1 GPa), E (373 ± 6) GPa and K IC (3.5 ± 0.7 MPa m ) at 4–5 atom% Cr. The hardness, modulus and toughness of the orthorhombic M 2 B phase increase with Cr content and reach values of H = 27 ± 0.7 GPa, E = 473 ± 9 of and K IC  = 3.26 ± 0.8 MPa m at maximal investigated Cr content of 55 atom%. The hardness of the M 2 B phases decreases around 2.3–3.2 GPa as a function of indentation depth, which is known as the indentation size effect. Hardness and fracture toughness of M 2 B phase outperform conventionally used M 7 C 3 carbides and are similar to MC-carbides. Findings can be used in novel alloying approaches in order to optimize the performance and reduce cost of tool steels. [ABSTRACT FROM AUTHOR]
Copyright of Materials & Design is the property of Elsevier B.V. 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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DbLabel: Engineering Source
An: 131186189
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  Label: Title
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  Data: Enhancement of hardness, modulus and fracture toughness of the tetragonal (Fe,Cr)2B and orthorhombic (Cr,Fe)2B phases with addition of Cr.
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  Data: <searchLink fieldCode="AR" term="%22Lentz%2C+Jonathan%22">Lentz, Jonathan</searchLink><relatesTo>1</relatesTo><i> Lentz@wtech.rub.de</i><br /><searchLink fieldCode="AR" term="%22Röttger%2C+Arne%22">Röttger, Arne</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Großwendt%2C+Felix%22">Großwendt, Felix</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Theisen%2C+Werner%22">Theisen, Werner</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Materials+%26+Design%22">Materials & Design</searchLink>. Oct2018, Vol. 156, p113-124. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Hardness%22">Hardness</searchLink><br /><searchLink fieldCode="DE" term="%22Fracture+toughness%22">Fracture toughness</searchLink><br /><searchLink fieldCode="DE" term="%22Elastic+modulus%22">Elastic modulus</searchLink><br /><searchLink fieldCode="DE" term="%22Borides%22">Borides</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoindentation+tests%22">Nanoindentation tests</searchLink><br /><searchLink fieldCode="DE" term="%22Orthorhombic+crystal+system%22">Orthorhombic crystal system</searchLink>
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  Label: Abstract
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  Data: This study analyzes the influence of Cr content on hardness H, elastic modulus E and fracture toughness K IC of the M 2 B boride by means of nanoindentation experiments. Additionally, properties of the Fe 3 (C,B) phase are determined. Samples of the M 2 B phase are casted and microstructurally characterized by means of scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. At a Cr content higher than 14.7 atom% the M 2 B phase transforms from tetragonal into orthorhombic structure. The tetragonal M 2 B type possesses an optimum of H (21 ± 1 GPa), E (373 ± 6) GPa and K IC (3.5 ± 0.7 MPa m ) at 4–5 atom% Cr. The hardness, modulus and toughness of the orthorhombic M 2 B phase increase with Cr content and reach values of H = 27 ± 0.7 GPa, E = 473 ± 9 of and K IC  = 3.26 ± 0.8 MPa m at maximal investigated Cr content of 55 atom%. The hardness of the M 2 B phases decreases around 2.3–3.2 GPa as a function of indentation depth, which is known as the indentation size effect. Hardness and fracture toughness of M 2 B phase outperform conventionally used M 7 C 3 carbides and are similar to MC-carbides. Findings can be used in novel alloying approaches in order to optimize the performance and reduce cost of tool steels. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials & Design is the property of Elsevier B.V. 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.matdes.2018.06.040
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 113
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      – SubjectFull: Hardness
        Type: general
      – SubjectFull: Fracture toughness
        Type: general
      – SubjectFull: Elastic modulus
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      – SubjectFull: Borides
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      – SubjectFull: Nanoindentation tests
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      – SubjectFull: Orthorhombic crystal system
        Type: general
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      – TitleFull: Enhancement of hardness, modulus and fracture toughness of the tetragonal (Fe,Cr)2B and orthorhombic (Cr,Fe)2B phases with addition of Cr.
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            NameFull: Röttger, Arne
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            NameFull: Großwendt, Felix
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              Text: Oct2018
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              Y: 2018
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