Non-destructive microstructural analysis by electrical conductivity: Comparison with hardness measurements in different materials

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Non-destructive microstructural analysis by electrical conductivity : Comparison with hardness measurements in different materials. / Sorger, Gonçalo L.; Oliveira, J. P.; Inácio, Patrick L.; Enzinger, Norbert; Vilaça, Pedro; Miranda, R. M.; Santos, Telmo G.

In: JOURNAL OF MATERIALS SCIENCE AND TECHNOLOGY, Vol. 35, No. 3, 01.03.2019, p. 360-368.

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Sorger, Gonçalo L. ; Oliveira, J. P. ; Inácio, Patrick L. ; Enzinger, Norbert ; Vilaça, Pedro ; Miranda, R. M. ; Santos, Telmo G. / Non-destructive microstructural analysis by electrical conductivity : Comparison with hardness measurements in different materials. In: JOURNAL OF MATERIALS SCIENCE AND TECHNOLOGY. 2019 ; Vol. 35, No. 3. pp. 360-368.

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@article{c2b0b20c8928489d887f9acf674d9c22,
title = "Non-destructive microstructural analysis by electrical conductivity: Comparison with hardness measurements in different materials",
abstract = "The use of non-destructive evaluation (NDE) techniques for assessing microstructural changes in processed materials is of particular importance as it can be used to assess, qualitatively, the integrity of any material/structure. Among the several NDE techniques available, electrical conductivity measurements using eddy currents attract great attention owing to its simplicity and reliability. In this work, the electrical conductivity profiles of friction stir processed Ti6Al4V, Cu, Pb, S355 steel and gas tungsten arc welded AISI 304 stainless steel were determined through eddy currents and four-point probe. In parallel, hardness measurements were also performed. The profiles matched well with the optical macrographs of the materials: while entering in the processed region a variation in both profiles was always observed. One particular advantage of electrical conductivity profiles over hardness was evident: it provides a better resolution of the microstructural alterations in the processed materials. Moreover, when thermomechanical processing induces microstructural changes that modify the magnetic properties of a material, eddy currents testing can be used to qualitatively determine the phase fraction in a given region of the material. A qualitative relation between electrical conductivity measurements and hardness is observed. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.",
keywords = "Electrical conductivity, Friction stir processing, Gas tungsten arc welding, Hardness, Non-destructive evaluation techniques",
author = "Sorger, {Gon{\cc}alo L.} and Oliveira, {J. P.} and In{\'a}cio, {Patrick L.} and Norbert Enzinger and Pedro Vila{\cc}a and Miranda, {R. M.} and Santos, {Telmo G.}",
year = "2019",
month = "3",
day = "1",
doi = "10.1016/j.jmst.2018.09.047",
language = "English",
volume = "35",
pages = "360--368",
journal = "JOURNAL OF MATERIALS SCIENCE AND TECHNOLOGY",
issn = "1005-0302",
publisher = "Chinese Society of Metals",
number = "3",

}

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TY - JOUR

T1 - Non-destructive microstructural analysis by electrical conductivity

T2 - Comparison with hardness measurements in different materials

AU - Sorger, Gonçalo L.

AU - Oliveira, J. P.

AU - Inácio, Patrick L.

AU - Enzinger, Norbert

AU - Vilaça, Pedro

AU - Miranda, R. M.

AU - Santos, Telmo G.

PY - 2019/3/1

Y1 - 2019/3/1

N2 - The use of non-destructive evaluation (NDE) techniques for assessing microstructural changes in processed materials is of particular importance as it can be used to assess, qualitatively, the integrity of any material/structure. Among the several NDE techniques available, electrical conductivity measurements using eddy currents attract great attention owing to its simplicity and reliability. In this work, the electrical conductivity profiles of friction stir processed Ti6Al4V, Cu, Pb, S355 steel and gas tungsten arc welded AISI 304 stainless steel were determined through eddy currents and four-point probe. In parallel, hardness measurements were also performed. The profiles matched well with the optical macrographs of the materials: while entering in the processed region a variation in both profiles was always observed. One particular advantage of electrical conductivity profiles over hardness was evident: it provides a better resolution of the microstructural alterations in the processed materials. Moreover, when thermomechanical processing induces microstructural changes that modify the magnetic properties of a material, eddy currents testing can be used to qualitatively determine the phase fraction in a given region of the material. A qualitative relation between electrical conductivity measurements and hardness is observed. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

AB - The use of non-destructive evaluation (NDE) techniques for assessing microstructural changes in processed materials is of particular importance as it can be used to assess, qualitatively, the integrity of any material/structure. Among the several NDE techniques available, electrical conductivity measurements using eddy currents attract great attention owing to its simplicity and reliability. In this work, the electrical conductivity profiles of friction stir processed Ti6Al4V, Cu, Pb, S355 steel and gas tungsten arc welded AISI 304 stainless steel were determined through eddy currents and four-point probe. In parallel, hardness measurements were also performed. The profiles matched well with the optical macrographs of the materials: while entering in the processed region a variation in both profiles was always observed. One particular advantage of electrical conductivity profiles over hardness was evident: it provides a better resolution of the microstructural alterations in the processed materials. Moreover, when thermomechanical processing induces microstructural changes that modify the magnetic properties of a material, eddy currents testing can be used to qualitatively determine the phase fraction in a given region of the material. A qualitative relation between electrical conductivity measurements and hardness is observed. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

KW - Electrical conductivity

KW - Friction stir processing

KW - Gas tungsten arc welding

KW - Hardness

KW - Non-destructive evaluation techniques

UR - http://www.scopus.com/inward/record.url?scp=85057807677&partnerID=8YFLogxK

U2 - 10.1016/j.jmst.2018.09.047

DO - 10.1016/j.jmst.2018.09.047

M3 - Article

VL - 35

SP - 360

EP - 368

JO - JOURNAL OF MATERIALS SCIENCE AND TECHNOLOGY

JF - JOURNAL OF MATERIALS SCIENCE AND TECHNOLOGY

SN - 1005-0302

IS - 3

ER -

ID: 30475229