Nano-Carbides and the Strength of Steels as Assessed by Electrical Resistivity Studies

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The work of Frommeyer on electrical conductivity measurements in pearlitic steels is reviewed to provide insight into microstructures developed during wi wire drawing. Electrical re conductivity measurements were made as a function of drawing strain (up to {var_epsilon} = 6.0) for wires with strength exceeding 3500MPa. The results show that electrical conductivity increases during wire wire-drawing to a maximum value, then decreases with further deformation finally reaching a steady state value that is equal to the original conductivity. The initial increase is the result of pearlite plate orientation in the direction of wire wire-drawing, which makes the path of conduction ... continued below

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8 p. (0.3 MB)

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Lesuer, D; Frommeyer, G; Sherby, O & Syn, C January 29, 2006.

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Description

The work of Frommeyer on electrical conductivity measurements in pearlitic steels is reviewed to provide insight into microstructures developed during wi wire drawing. Electrical re conductivity measurements were made as a function of drawing strain (up to {var_epsilon} = 6.0) for wires with strength exceeding 3500MPa. The results show that electrical conductivity increases during wire wire-drawing to a maximum value, then decreases with further deformation finally reaching a steady state value that is equal to the original conductivity. The initial increase is the result of pearlite plate orientation in the direction of wire wire-drawing, which makes the path of conduction through the ferrite plates more accessible. At a critical strain the cementite plates begin to fragment and the electrical conductivity decreases to a steady state value that is the same as that observed prior to wire drawing. With increasing strain, the cementite particles are refined and the strength increases due to the reduction in inter inter-particle spacing. It is concluded that the electrical conductivity of the wires is solely dependent on the amount of iron carbides provided they are randomly distributed as plates or as particles. An estimate was made that indicates the carbide particle size is approximately 3-5 nm in the steady state range of electrical conductivity.

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8 p. (0.3 MB)

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PDF-file: 8 pages; size: 0.3 Mbytes

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  • Presented at: Thermec 2006, Vancouver, Canada, Jul 04 - Jul 08, 2006

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  • Report No.: UCRL-CONF-218597
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 893996
  • Archival Resource Key: ark:/67531/metadc878956

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Office of Scientific & Technical Information Technical Reports

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  • January 29, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • April 17, 2017, 1:35 p.m.

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Lesuer, D; Frommeyer, G; Sherby, O & Syn, C. Nano-Carbides and the Strength of Steels as Assessed by Electrical Resistivity Studies, article, January 29, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc878956/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.