Microstructural development of HP9/4/30 steel during partial remelting

Mohd. Zaidi Omar, Helen V. Atkinson, Eric J. Palmiere, Andrew A. Howe, Plato Kapranos

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Semi-solid processing, also known as thixoforming, is a forming process that shapes metal components in their semi-solid state. Prior to forming, the microstructure of the alloy consists preferably of solid metal spheroids in a liquid matrix. This paper describes the microstructural development within the semi-solid zone of a typically banded high performance HP9/4/30 steel through a direct partial remelting process from as-received and as-deformed conditions. Partial remelting was carried out at temperatures between 1430 and 1470°C. Liquation occurred initially at the grain boundaries, then also along the segregation bands. With increasing time and hold temperature, these "columns" broke down into shorter, more equiaxed segments, offering a better chance of being thixoformed. The microstructures revealed distinct polygonal cells at 1430°C that changed to more rounded solid grains with diminishing sharp edges at 1450°C, followed by smaller truncated cell structures due to the liquation of the bands at 1460°C and 1470°C. The partial remelting procedures carried out in this study are from material that is in a recrystallised state. Thixoforming from this recrystallised state is shown to be successful. This indicates a widening of the range of potential routes to thixoformable microstructures.

Original languageEnglish
Pages (from-to)552-560
Number of pages9
JournalSteel Research International
Volume75
Issue number8-9
Publication statusPublished - Aug 2004
Externally publishedYes

Fingerprint

Remelting
Steel
melting
steels
microstructure
Microstructure
Metals
spheroids
cells
metals
grain boundaries
breakdown
routes
solid state
Grain boundaries
temperature
matrices
liquids
Temperature
Liquids

Keywords

  • Partial remelting
  • Segregation bands
  • Thixoforming

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Omar, M. Z., Atkinson, H. V., Palmiere, E. J., Howe, A. A., & Kapranos, P. (2004). Microstructural development of HP9/4/30 steel during partial remelting. Steel Research International, 75(8-9), 552-560.

Microstructural development of HP9/4/30 steel during partial remelting. / Omar, Mohd. Zaidi; Atkinson, Helen V.; Palmiere, Eric J.; Howe, Andrew A.; Kapranos, Plato.

In: Steel Research International, Vol. 75, No. 8-9, 08.2004, p. 552-560.

Research output: Contribution to journalArticle

Omar, MZ, Atkinson, HV, Palmiere, EJ, Howe, AA & Kapranos, P 2004, 'Microstructural development of HP9/4/30 steel during partial remelting', Steel Research International, vol. 75, no. 8-9, pp. 552-560.
Omar MZ, Atkinson HV, Palmiere EJ, Howe AA, Kapranos P. Microstructural development of HP9/4/30 steel during partial remelting. Steel Research International. 2004 Aug;75(8-9):552-560.
Omar, Mohd. Zaidi ; Atkinson, Helen V. ; Palmiere, Eric J. ; Howe, Andrew A. ; Kapranos, Plato. / Microstructural development of HP9/4/30 steel during partial remelting. In: Steel Research International. 2004 ; Vol. 75, No. 8-9. pp. 552-560.
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