Viscosity - Shear rate relationship during the thixoforming of HP9/4/30 steel

Mohd. Zaidi Omar, H. V. Atkinson, E. J. Palmiere, A. A. Howe, P. Kapranos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

Thixoforming involves shaping metal components in the semi-solid state. Work on the thixoforming of high temperature materials, such as steel, is still at its initial stage; this is mainly due to the high processing temperatures involved and the potential for oxidation. For thixoforming to be possible, it is preferable for an alloy to have an appreciable melting range and before forming the microstructure must ideally consist of solid metal spheroids in a liquid matrix. This paper discusses the thixoforming load versus displacement curves of HP9/4/30 steel semi-solid slugs under compression. The data from the corresponding load-displacement curves is converted into viscosity against shear rate adopting Stefan's equation for flow between two parallel planes. The viscosity at processing conditions, i.e. at processing temperatures in the range of 1470 to 1480°C and zero to two minutes soak times, showed a rapid decrease initially, which corresponds to a rapid breakdown in the structure, followed by a steady decrease to a near constant value with increasing rate. The work shows pseudoplasticity (or shear-thinning) behaviour of the HP9/4/30 semi-solid slurries. This data would be required for modeling the die fill with these slurries.

Original languageEnglish
Title of host publicationSolid State Phenomena
PublisherTrans Tech Publications Ltd
Pages677-680
Number of pages4
Volume116-117
ISBN (Print)3908451264, 9783908451266
Publication statusPublished - 2006
Event9th International Conference on Semi-Solid Processing of Alloys and Composites, S2P 2006 - Busan
Duration: 11 Sep 200613 Sep 2006

Publication series

NameSolid State Phenomena
Volume116-117
ISSN (Print)10120394

Other

Other9th International Conference on Semi-Solid Processing of Alloys and Composites, S2P 2006
CityBusan
Period11/9/0613/9/06

Fingerprint

Steel
Shear deformation
slurries
steels
Viscosity
viscosity
shear
Slurries
refractory materials
shear thinning
Processing
Metals
spheroids
curves
metals
Shear thinning
breakdown
melting
Temperature
solid state

Keywords

  • HP9/4/30 steel
  • Thixoforming
  • Viscosity-shear rate

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Omar, M. Z., Atkinson, H. V., Palmiere, E. J., Howe, A. A., & Kapranos, P. (2006). Viscosity - Shear rate relationship during the thixoforming of HP9/4/30 steel. In Solid State Phenomena (Vol. 116-117, pp. 677-680). (Solid State Phenomena; Vol. 116-117). Trans Tech Publications Ltd.

Viscosity - Shear rate relationship during the thixoforming of HP9/4/30 steel. / Omar, Mohd. Zaidi; Atkinson, H. V.; Palmiere, E. J.; Howe, A. A.; Kapranos, P.

Solid State Phenomena. Vol. 116-117 Trans Tech Publications Ltd, 2006. p. 677-680 (Solid State Phenomena; Vol. 116-117).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Omar, MZ, Atkinson, HV, Palmiere, EJ, Howe, AA & Kapranos, P 2006, Viscosity - Shear rate relationship during the thixoforming of HP9/4/30 steel. in Solid State Phenomena. vol. 116-117, Solid State Phenomena, vol. 116-117, Trans Tech Publications Ltd, pp. 677-680, 9th International Conference on Semi-Solid Processing of Alloys and Composites, S2P 2006, Busan, 11/9/06.
Omar MZ, Atkinson HV, Palmiere EJ, Howe AA, Kapranos P. Viscosity - Shear rate relationship during the thixoforming of HP9/4/30 steel. In Solid State Phenomena. Vol. 116-117. Trans Tech Publications Ltd. 2006. p. 677-680. (Solid State Phenomena).
Omar, Mohd. Zaidi ; Atkinson, H. V. ; Palmiere, E. J. ; Howe, A. A. ; Kapranos, P. / Viscosity - Shear rate relationship during the thixoforming of HP9/4/30 steel. Solid State Phenomena. Vol. 116-117 Trans Tech Publications Ltd, 2006. pp. 677-680 (Solid State Phenomena).
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