ON THE MECHANISM OF YIELDING AND FLOW IN IRON

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The activation energy, activation volume, snd frequency factor were evaluated for yielding (delay time for yielding, upper yield stress, lower yield stress, and Luders band propagation) and flow (friction stress, flow stress, and dislocation mobility) for various irons and steels from data in the literature. It was found that the values of these flow parameters and their stress dependence were the same, within experimental error, for both yielding and flow, and for all the materials considered. This suggests that either the same dislocation mechanism is controlling in every case, or that one or more mechanisms possees approximately the same values ... continued below

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Pages: 40

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Conrad, H May 30, 1961.

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Description

The activation energy, activation volume, snd frequency factor were evaluated for yielding (delay time for yielding, upper yield stress, lower yield stress, and Luders band propagation) and flow (friction stress, flow stress, and dislocation mobility) for various irons and steels from data in the literature. It was found that the values of these flow parameters and their stress dependence were the same, within experimental error, for both yielding and flow, and for all the materials considered. This suggests that either the same dislocation mechanism is controlling in every case, or that one or more mechanisms possees approximately the same values for these parameters. The dislocation mechanism for which there was closest agreement between theoretical calculations snd experimental data was overcoming the Peierls stress. On the basis of the available experimental data and the present analysis, it is suggested that the upper and lower yield stresses in iron and steel may represent the sudden generation of a large number of dislocations by the double cross-slip mechanism of Koehler and Orowan, rather than the breaking away from a Cottrell atmosphere. (auth)

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Pages: 40

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  • Other Information: Orig. Receipt Date: 31-DEC-61

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  • Report No.: NAA-SR-5838
  • Grant Number: AT(11-1)-GEN-8
  • DOI: 10.2172/4064971 | External Link
  • Office of Scientific & Technical Information Report Number: 4064971
  • Archival Resource Key: ark:/67531/metadc865351

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Creation Date

  • May 30, 1961

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Sept. 28, 2016, 6:57 p.m.

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Conrad, H. ON THE MECHANISM OF YIELDING AND FLOW IN IRON, report, May 30, 1961; Canoga Park, California. (https://digital.library.unt.edu/ark:/67531/metadc865351/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.