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Title: Influences Of Size Effects On The Rolling Of Micro Strip

Abstract

Comparison between down-scaled flat rolling experiments of thin round wire and numerical simulation of those experiments have shown that the production process of manufacturing micro strip out of thin round wire is influenced by size effects. From plane strain compression tests, used as a physical simulation of the rolling process it is concluded that second order size effects of mechanical strength cause decreasing resistance to forming with decreasing wire diameters for rolling experiments with 25% and 50% reduction.

Authors:
; ;  [1]
  1. Metal Forming Institute, RWTH Aachen University, Intzestrasse 10, D-52056 (Germany)
Publication Date:
OSTI Identifier:
21057068
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 907; Journal Issue: 1; Conference: 10. ESAFORM conference on material forming, Zaragoza (Spain), 18-20 Apr 2007; Other Information: DOI: 10.1063/1.2729583; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; COMPARATIVE EVALUATIONS; COMPRESSION; COMPUTERIZED SIMULATION; MACHINING; MANUFACTURING; ROLLING; STRAINS; TESTING; WIRES

Citation Formats

Putten, Koos van, Kopp, Reiner, and Hirt, Gerhard. Influences Of Size Effects On The Rolling Of Micro Strip. United States: N. p., 2007. Web. doi:10.1063/1.2729583.
Putten, Koos van, Kopp, Reiner, & Hirt, Gerhard. Influences Of Size Effects On The Rolling Of Micro Strip. United States. doi:10.1063/1.2729583.
Putten, Koos van, Kopp, Reiner, and Hirt, Gerhard. Sat . "Influences Of Size Effects On The Rolling Of Micro Strip". United States. doi:10.1063/1.2729583.
@article{osti_21057068,
title = {Influences Of Size Effects On The Rolling Of Micro Strip},
author = {Putten, Koos van and Kopp, Reiner and Hirt, Gerhard},
abstractNote = {Comparison between down-scaled flat rolling experiments of thin round wire and numerical simulation of those experiments have shown that the production process of manufacturing micro strip out of thin round wire is influenced by size effects. From plane strain compression tests, used as a physical simulation of the rolling process it is concluded that second order size effects of mechanical strength cause decreasing resistance to forming with decreasing wire diameters for rolling experiments with 25% and 50% reduction.},
doi = {10.1063/1.2729583},
journal = {AIP Conference Proceedings},
number = 1,
volume = 907,
place = {United States},
year = {Sat Apr 07 00:00:00 EDT 2007},
month = {Sat Apr 07 00:00:00 EDT 2007}
}
  • A single crystal Al specimen was molded at room temperature with long, rectangular, strip diamond punches. Quantitative molding response curves were obtained at a series of punch widths, ranging from 5 {micro}m to 550 nm. A significant size effect was observed, manifesting itself in terms of significantly increasing characteristic molding pressure as the punch width decreases to 1.5 {micro}m and below. A detailed comparison of the present strip punch molding results was made with Berkovich pyramidal indentation on the same single crystal Al specimen. The comparison reveals distinctly different dependence of the characteristic pressure on corresponding characteristic length. The presentmore » results show the feasibility of micro-/nano-scale compression molding as a micro-/nano-fabrication technique, and offer an experimental test case for size-dependent plasticity theories.« less
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  • Asymmetrical rolling is a promising way to achieve high rolling reductions and potentially grain refinement. However in steels the effect of asymmetrical rolling is not thoroughly quantified. In this paper the impact of cold asymmetrical rolling obtained by changing the roll velocity ratio (from 1.1 to 1.45) on the deformation and recrystallization features has been finely investigated by Electron Back-Scattering Diffraction in a Scanning Electron Microscope. In the investigated conditions (with low thickness reduction), it is found that asymmetrical rolling induces grain refinement and more homogeneous gamma fiber texture.
  • The mechanical properties and development of microstructure and texture of a low carbon steel produced by Flexible Thin Slab Rolling (FTSR) with warm rolling technology were investigated using scanning electron microscopy, transmission electron microscopy, electron back-scattered diffraction and X-ray diffraction etc. The microstructural features in the hot strip are mainly large polygonal ferrite grains with very few or hardly any pearlite colonies. The values of yield strength and tensile strength are in the range of 215-240 MPa and 305-335 MPa, respectively, and the elongation is in the range of 33-41%. The ferrite softening can be attributed to ferrite recrystallization. Evenmore » though the dominant bulk texture is the typical recrystallization texture, which can be grouped into the ND fibre ({l_brace}111{r_brace}<110-112>) having a <111> axis parallel to the normal direction, a weak {l_brace}110{r_brace}<112> transformation texture was also observed in the final microstructure by electron back-scattered diffraction. By analysis, the large grain size is explained in terms of ferrite recrystallization and relevant growth mechanisms, and the ferrite recrystallization can be considered to play a major role in determining the grain size in the microstructure of the low carbon steel produced by FTSR with warm rolling technology.« less
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