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Characterisation by EBSD of Cold Rolled High-Silicon Steel

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Abstract
Steel containing a high Si-content is mainly used as electrical steel in flux carrying electrical machines. These materials are divided in the categories: grain oriented and non oriented electrical steels, mainly used in transformers and electrical motors, respectively. Their industrial production is normally limited to silicon contents lower than 3.5 m.-%, due to the generation of brittle ordered structures if the Si content is increased beyond this value. The paper reports on microstructure and texture evolution during processing by rolling of electrical steel in the high Si-range. The materials studied are two industrial electrical steels with a silicon content of 2.4 and 3.2 m.-%, their situation was as-received after hot rolling and industrial annealing. The different processing parameters, as rolling temperatures and cooling conditions have a strong influence on the final microstructures and textures. The importance of hot rolling and intermediate annealing processes is enhanced since above 2 m.-% Si these steels do not experience the usual alpha-gamma-alpha phase transformation, because they present a bcc crystal structure over the entire solidus domain. Consequently, their microstructures and textures are strongly inherited from the earlier processing steps into the final product. The as-received materials were cold rolled with a nominal reduction of 75%. Their microstructures and textures were analysed by EBSD. The results obtained were compared with those of the industrial hot band. The textures were studied by the interpretation of the most important crystallographic fibre textures, extracted from the ODF's of phi(2) = 45 degrees section of the Euler space. Special attention was given to the evolution of the most important magnetic textural components. Although in terms of grain shape, IQ, texture and normalised thickness position or 's'-parameter the microstructures obtained before and after cold rolling are totally different, the overall crystallographic textures seem not to differ very much.
Keywords
Electrical steel, high silicon, rolling, microstructure, EBSD

Citation

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Chicago
Calvillo, PR, Jürgen Schneider, and Yvan Houbaert. 2009. “Characterisation by EBSD of Cold Rolled High-Silicon Steel.” In Diffusion in Solids and Liquids Iv, ed. A; Murch Ochsner, 283-286:413–418. STAFA-ZURICH: TRANS TECH PUBLICATIONS LTD.
APA
Calvillo, P., Schneider, J., & Houbaert, Y. (2009). Characterisation by EBSD of Cold Rolled High-Silicon Steel. In A. M. Ochsner (Ed.), DIFFUSION IN SOLIDS AND LIQUIDS IV (Vol. 283–286, pp. 413–418). Presented at the 4th International Conference on Diffusion in Solids and Liquids, STAFA-ZURICH: TRANS TECH PUBLICATIONS LTD.
Vancouver
1.
Calvillo P, Schneider J, Houbaert Y. Characterisation by EBSD of Cold Rolled High-Silicon Steel. In: Ochsner AM, editor. DIFFUSION IN SOLIDS AND LIQUIDS IV. STAFA-ZURICH: TRANS TECH PUBLICATIONS LTD; 2009. p. 413–8.
MLA
Calvillo, PR, Jürgen Schneider, and Yvan Houbaert. “Characterisation by EBSD of Cold Rolled High-Silicon Steel.” Diffusion in Solids and Liquids Iv. Ed. A; Murch Ochsner. Vol. 283–286. STAFA-ZURICH: TRANS TECH PUBLICATIONS LTD, 2009. 413–418. Print.
@inproceedings{1000469,
  abstract     = {Steel containing a high Si-content is mainly used as electrical steel in flux carrying electrical machines. These materials are divided in the categories: grain oriented and non oriented electrical steels, mainly used in transformers and electrical motors, respectively. Their industrial production is normally limited to silicon contents lower than 3.5 m.-\%, due to the generation of brittle ordered structures if the Si content is increased beyond this value.

The paper reports on microstructure and texture evolution during processing by rolling of electrical steel in the high Si-range. The materials studied are two industrial electrical steels with a silicon content of 2.4 and 3.2 m.-\%, their situation was as-received after hot rolling and industrial annealing. The different processing parameters, as rolling temperatures and cooling conditions have a strong influence on the final microstructures and textures. The importance of hot rolling and intermediate annealing processes is enhanced since above 2 m.-\% Si these steels do not experience the usual alpha-gamma-alpha phase transformation, because they present a bcc crystal structure over the entire solidus domain. Consequently, their microstructures and textures are strongly inherited from the earlier processing steps into the final product.

The as-received materials were cold rolled with a nominal reduction of 75\%. Their microstructures and textures were analysed by EBSD. The results obtained were compared with those of the industrial hot band. The textures were studied by the interpretation of the most important crystallographic fibre textures, extracted from the ODF's of phi(2) = 45 degrees section of the Euler space. Special attention was given to the evolution of the most important magnetic textural components. Although in terms of grain shape, IQ, texture and normalised thickness position or 's'-parameter the microstructures obtained before and after cold rolling are totally different, the overall crystallographic textures seem not to differ very much.},
  author       = {Calvillo, PR and Schneider, J{\"u}rgen and Houbaert, Yvan},
  booktitle    = {DIFFUSION IN SOLIDS AND LIQUIDS IV},
  editor       = {Ochsner, A; Murch},
  issn         = {1012-0386},
  keyword      = {Electrical steel,high silicon,rolling,microstructure,EBSD},
  language     = {eng},
  location     = {Barcelona, SPAIN},
  pages        = {413--418},
  publisher    = {TRANS TECH PUBLICATIONS LTD},
  title        = {Characterisation by EBSD of Cold Rolled High-Silicon Steel},
  volume       = {283-286},
  year         = {2009},
}

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