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Non-destructive measurement of microstructure and tensile strength in varying thickness commercial DP steel strip using an EM sensor

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Aghadavoudi-Jolfaei, M., Shen, J., Smith, A., Zhou, Lei and Davis, Claire (2019) Non-destructive measurement of microstructure and tensile strength in varying thickness commercial DP steel strip using an EM sensor. Journal of Magnetism and Magnetic Materials, 473 . pp. 477-483. doi:10.1016/j.jmmm.2018.10.099

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Official URL: http://dx.doi.org/10.1016/j.jmmm.2018.10.099

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Abstract

It is desirable to be able to non-destructively evaluate the microstructural features and/or mechanical properties of steel strip. An electromagnetic sensor – sample FE model, developed in COMSOL multi-physics software, has been developed to determine the relationship between the low magnetic field relative permeability and microstructure (phase balance and grain size), and hence tensile strength, for commercial dual phase (DP) steel sheets of any thickness. The model for the effect of thickness on the sensor signal has been validated using DP steel sheets of 1 to 4 mm. It was found that the relative permeability is strongly dependent on the phase balance (fraction of ferrite and martensite) in the DP steels with an increasing relative permeability being seen for a higher fraction of ferrite. In addition, changes in the ferrite grain size also affect the relative permeability (increase in grain size increases relative permeability) and hence EM sensor signal, this being more significant for the higher ferrite content DP grades. Both these microstructural features affect the tensile strength (which decreases with an increase in ferrite fraction and increase in grain size), which results in a good correlation between the relative permeability and tensile strength. The results from the relative permeability – microstructure – tensile strength investigation and FE model to account for strip thickness have been combined to allow the prediction of tensile strength from EM sensor measurements on as-received commercial DP steel sheets of varying thickness and the approach has been tested.

Item Type: Journal Article
Subjects: T Technology > TS Manufactures
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Steel strip -- Testing, Nondestructive testing
Journal or Publication Title: Journal of Magnetism and Magnetic Materials
Publisher: Elsevier Science BV
ISSN: 0304-8853
Official Date: 1 March 2019
Dates:
DateEvent
1 March 2019Published
22 October 2018Available
20 October 2018Accepted
Date of first compliant deposit: 28 March 2019
Volume: 473
Page Range: pp. 477-483
DOI: 10.1016/j.jmmm.2018.10.099
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIED[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
UNSPECIFIEDTata Steelhttp://dx.doi.org/10.13039/501100007220

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