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Room-temperature short-range ordering in Fe-Si alloys observed by internal friction

(2008) Solid State Phenomena. 137. p.83-90
Author
Organization
Abstract
Research performed at Ghent University, regarding new production methods for electrical steel, has shown that high silicon steel suffers an ageing phenomenon at room temperature. Recent studies carried out by the same group using different analysis techniques (Mossbauer spectroscopy, neutron diffraction, etc) brought to light a probable process of ordering towards the D0(3)-structure, which is responsible for the observed low ductility during cold rolling and makes the processing of steel extremely difficult. In addition, the Si-steels become more brittle as the delay time between hot and cold rolling is increased. Frequency dependent internal friction (FDIF) studies were performed on different Fe - Si alloys with a Si content varying from 3.73 at. % to 8.7 at. % immediately after several thermal treatments and compared with ultra-low carbon steel. The evolution of relaxation peaks during the IF measurements, performed at constant room temperature, helps to understand the ageing mechanisms. Three processes have been observed: firstly, as expected, addition of Si reduces the carbon Snock peak. Secondly, a peak associated to C - Si is formed. Thirdly, a low frequency peak associated with Zener relaxation (Si atom pairs) appears for a content of approximately 3.77 wt. % Si. The two latter peaks decrease with ageing time and in the case of the Zener peak there is a notable displacement to higher frequencies with a small increase of the Si content. The reduction of the peaks during the ageing after annealing is more noticeable in quenched specimens than in air cooled ones, and in furnace cooled specimens the reduction is even smaller, indicating that the process is really an ageing phenomenon. Room temperature short-range ordering might explain both the lowering of the Zener peak and the observed macroscopic embrittlement.
Keywords
room temperature ageing., silicon steel, isothermal internal friction, Zener peak

Citation

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MLA
González Cámara, Fernando, Daniel Ruiz, and Yvan Houbaert. “Room-temperature Short-range Ordering in Fe-Si Alloys Observed by Internal Friction.” Solid State Phenomena. Ed. Igor Golovin & Daniil Levin. Vol. 137. Switzerland: Trans Tech Publications, 2008. 83–90. Print.
APA
González Cámara, F., Ruiz, D., & Houbaert, Y. (2008). Room-temperature short-range ordering in Fe-Si alloys observed by internal friction. In I. Golovin & D. Levin (Eds.), Solid State Phenomena (Vol. 137, pp. 83–90). Presented at the 11th International Conference of Imperfections Interaction and Anelastic Phenomena in Solids, Switzerland: Trans Tech Publications.
Chicago author-date
González Cámara, Fernando, Daniel Ruiz, and Yvan Houbaert. 2008. “Room-temperature Short-range Ordering in Fe-Si Alloys Observed by Internal Friction.” In Solid State Phenomena, ed. Igor Golovin and Daniil Levin, 137:83–90. Switzerland: Trans Tech Publications.
Chicago author-date (all authors)
González Cámara, Fernando, Daniel Ruiz, and Yvan Houbaert. 2008. “Room-temperature Short-range Ordering in Fe-Si Alloys Observed by Internal Friction.” In Solid State Phenomena, ed. Igor Golovin and Daniil Levin, 137:83–90. Switzerland: Trans Tech Publications.
Vancouver
1.
González Cámara F, Ruiz D, Houbaert Y. Room-temperature short-range ordering in Fe-Si alloys observed by internal friction. In: Golovin I, Levin D, editors. Solid State Phenomena. Switzerland: Trans Tech Publications; 2008. p. 83–90.
IEEE
[1]
F. González Cámara, D. Ruiz, and Y. Houbaert, “Room-temperature short-range ordering in Fe-Si alloys observed by internal friction,” in Solid State Phenomena, Tula, Russia, 2008, vol. 137, pp. 83–90.
@inproceedings{528733,
  abstract     = {Research performed at Ghent University, regarding new production methods for electrical steel, has shown that high silicon steel suffers an ageing phenomenon at room temperature. Recent studies carried out by the same group using different analysis techniques (Mossbauer spectroscopy, neutron diffraction, etc) brought to light a probable process of ordering towards the D0(3)-structure, which is responsible for the observed low ductility during cold rolling and makes the processing of steel extremely difficult. In addition, the Si-steels become more brittle as the delay time between hot and cold rolling is increased.

Frequency dependent internal friction (FDIF) studies were performed on different Fe - Si alloys with a Si content varying from 3.73 at. % to 8.7 at. % immediately after several thermal treatments and compared with ultra-low carbon steel. The evolution of relaxation peaks during the IF measurements, performed at constant room temperature, helps to understand the ageing mechanisms. Three processes have been observed: firstly, as expected, addition of Si reduces the carbon Snock peak. Secondly, a peak associated to C - Si is formed. Thirdly, a low frequency peak associated with Zener relaxation (Si atom pairs) appears for a content of approximately 3.77 wt. % Si. The two latter peaks decrease with ageing time and in the case of the Zener peak there is a notable displacement to higher frequencies with a small increase of the Si content. The reduction of the peaks during the ageing after annealing is more noticeable in quenched specimens than in air cooled ones, and in furnace cooled specimens the reduction is even smaller, indicating that the process is really an ageing phenomenon.

Room temperature short-range ordering might explain both the lowering of the Zener peak and the observed macroscopic embrittlement.},
  author       = {González Cámara, Fernando and Ruiz, Daniel and Houbaert, Yvan},
  booktitle    = {Solid State Phenomena},
  editor       = {Golovin, Igor and Levin, Daniil},
  issn         = {1012-0394},
  keywords     = {room temperature ageing.,silicon steel,isothermal internal friction,Zener peak},
  language     = {eng},
  location     = {Tula, Russia},
  pages        = {83--90},
  publisher    = {Trans Tech Publications},
  title        = {Room-temperature short-range ordering in Fe-Si alloys observed by internal friction},
  url          = {http://dx.doi.org/10.4028/www.scientific.net/SSP.137.83},
  volume       = {137},
  year         = {2008},
}

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