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Non-destructive testing of thin strip material: Implementation of the 3MA technique at a steel producing company
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
2017 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This study is an initial attempt to investigate the possibility of substituting conventional laboratory destructive testing techniques at Sandvik's strip steel production facilities with the 3MA (Micro-magnetic Multi-parameter Microstructure and Stress Analysis) NDT (nondestructive testing) technique. The interest for the research comes from various problems with the actual destructive testing method. Sandvik manufactures thin strip steel (among other products) and controls the quality of its product by taking samples from the ends of the strip and measuring the sample's material properties in a separate laboratory. Hence, the sample preparation process is time and material consuming, and the results obtained from the laboratory measurements are not always representative of the real values along the whole length of the strip (usually several kilometers).

Therefore, the present project involves the correlation between three material properties (Vickers hardness, tensile strength and carbide density) and a selection of micro-magnetic parameters measured with the 3MA-II equipment manufactured by the Fraunhofer IZFP institute. The 3MA-II system is based on four measuring techniques (harmonic analysis, magnetic Barkhausen noise, incremental permeability and Eddy current testing) and is capable of recording up to 41 micro-magnetic parameters. Samples of two different steel grades (composition) were used in the study.

The results for hardness and tensile strength (average relative errors of 1.04% and 0.78%, respectively) corroborated the applicability of the 3MA technique to steel strip inspection. Thus, the implementation of this technique would lead to an improvement in the company's energy efficiency and sustainability. However, finding a good correlation between micromagnetic parameters and material properties is not always possible and, in the case of carbide density, no reliable correlation was achieved. So, further experiments are proposed for future studies regarding carbide density and other material properties.

Place, publisher, year, edition, pages
2017. , 57 p.
Keyword [en]
Non-destructive testing, 3MA, steel strip, process monitoring and control, energy efficiency, sustainability, hardness, tensile strength
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:hig:diva-24256OAI: oai:DiVA.org:hig-24256DiVA: diva2:1110264
External cooperation
Sandvik Materials Technology
Subject / course
Energy systems
Educational program
Energy systems – master’s programme (one year) (swe or eng)
Supervisors
Examiners
Available from: 2017-06-21 Created: 2017-06-15 Last updated: 2017-06-21Bibliographically approved

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fulltext(3352 kB)28 downloads
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Department of Building, Energy and Environmental Engineering
Energy Systems

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard-cite-them-right
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • sv-SE
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  • de-DE
  • Other locale
More languages
Output format
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