Solid-liquid structural break-up in M2 tool steel for semi-solid metal processing

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

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The success of semi-solid metal processing mostly depends on the formation of suitable starting microstructure, which must consist of solid metal spheroids in a liquid matrix. Various methods of obtaining this structure have been established; they include recrystallisation and partial melting (RAP), strain-induced melt-activated (SIMA), or simple mechanical stirring, to name a few. These methods, as widely discussed, have mostly been applied with light alloys, mainly aluminium based. This article discusses solid-liquid structural break-up in M2 tool steel subjected to a direct re-melting procedure from the as-annealed condition. The role of carbide dissolution in the grain boundary liquation of the steel is described. This leads to the production of near spheroidal solid grains in a liquid matrix, a microstructure suitable for the thixoforming process. Microstructural examination revealed that carbide particles contained in bands at 1220 °C slowly disappeared with temperature. At 1300 °C, the solid grains seemed to be free from carbides. Most of the carbides had now re-precipitated at the grain boundaries. Thixoforming carried out at 1340 and 1360 °C revealed the thixotropic properties of the semi-solid metal slurries. The results indicate a widening of the range of potential routes to thixoformable microstructures.

Original languageEnglish
Pages (from-to)869-874
Number of pages6
JournalJournal of Materials Science
Volume44
Issue number3
DOIs
Publication statusPublished - Feb 2009

Fingerprint

Drop breakup
Tool steel
Metals
Carbides
Liquids
Processing
Microstructure
Grain boundaries
Melting
Steel
Slurries
Aluminum alloys
Dissolution

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Solid-liquid structural break-up in M2 tool steel for semi-solid metal processing. / Omar, Mohd. Zaidi; Atkinson, H. V.; Howe, A. A.; Palmiere, E. J.; Kapranos, P.; Ghazali, Mariyam Jameelah.

In: Journal of Materials Science, Vol. 44, No. 3, 02.2009, p. 869-874.

Research output: Contribution to journalArticle

Omar, Mohd. Zaidi ; Atkinson, H. V. ; Howe, A. A. ; Palmiere, E. J. ; Kapranos, P. ; Ghazali, Mariyam Jameelah. / Solid-liquid structural break-up in M2 tool steel for semi-solid metal processing. In: Journal of Materials Science. 2009 ; Vol. 44, No. 3. pp. 869-874.
@article{1aae2540af96440da5280736457ac333,
title = "Solid-liquid structural break-up in M2 tool steel for semi-solid metal processing",
abstract = "The success of semi-solid metal processing mostly depends on the formation of suitable starting microstructure, which must consist of solid metal spheroids in a liquid matrix. Various methods of obtaining this structure have been established; they include recrystallisation and partial melting (RAP), strain-induced melt-activated (SIMA), or simple mechanical stirring, to name a few. These methods, as widely discussed, have mostly been applied with light alloys, mainly aluminium based. This article discusses solid-liquid structural break-up in M2 tool steel subjected to a direct re-melting procedure from the as-annealed condition. The role of carbide dissolution in the grain boundary liquation of the steel is described. This leads to the production of near spheroidal solid grains in a liquid matrix, a microstructure suitable for the thixoforming process. Microstructural examination revealed that carbide particles contained in bands at 1220 °C slowly disappeared with temperature. At 1300 °C, the solid grains seemed to be free from carbides. Most of the carbides had now re-precipitated at the grain boundaries. Thixoforming carried out at 1340 and 1360 °C revealed the thixotropic properties of the semi-solid metal slurries. The results indicate a widening of the range of potential routes to thixoformable microstructures.",
author = "Omar, {Mohd. Zaidi} and Atkinson, {H. V.} and Howe, {A. A.} and Palmiere, {E. J.} and P. Kapranos and Ghazali, {Mariyam Jameelah}",
year = "2009",
month = "2",
doi = "10.1007/s10853-008-3181-1",
language = "English",
volume = "44",
pages = "869--874",
journal = "Journal of Materials Science",
issn = "0022-2461",
publisher = "Springer Netherlands",
number = "3",

}

TY - JOUR

T1 - Solid-liquid structural break-up in M2 tool steel for semi-solid metal processing

AU - Omar, Mohd. Zaidi

AU - Atkinson, H. V.

AU - Howe, A. A.

AU - Palmiere, E. J.

AU - Kapranos, P.

AU - Ghazali, Mariyam Jameelah

PY - 2009/2

Y1 - 2009/2

N2 - The success of semi-solid metal processing mostly depends on the formation of suitable starting microstructure, which must consist of solid metal spheroids in a liquid matrix. Various methods of obtaining this structure have been established; they include recrystallisation and partial melting (RAP), strain-induced melt-activated (SIMA), or simple mechanical stirring, to name a few. These methods, as widely discussed, have mostly been applied with light alloys, mainly aluminium based. This article discusses solid-liquid structural break-up in M2 tool steel subjected to a direct re-melting procedure from the as-annealed condition. The role of carbide dissolution in the grain boundary liquation of the steel is described. This leads to the production of near spheroidal solid grains in a liquid matrix, a microstructure suitable for the thixoforming process. Microstructural examination revealed that carbide particles contained in bands at 1220 °C slowly disappeared with temperature. At 1300 °C, the solid grains seemed to be free from carbides. Most of the carbides had now re-precipitated at the grain boundaries. Thixoforming carried out at 1340 and 1360 °C revealed the thixotropic properties of the semi-solid metal slurries. The results indicate a widening of the range of potential routes to thixoformable microstructures.

AB - The success of semi-solid metal processing mostly depends on the formation of suitable starting microstructure, which must consist of solid metal spheroids in a liquid matrix. Various methods of obtaining this structure have been established; they include recrystallisation and partial melting (RAP), strain-induced melt-activated (SIMA), or simple mechanical stirring, to name a few. These methods, as widely discussed, have mostly been applied with light alloys, mainly aluminium based. This article discusses solid-liquid structural break-up in M2 tool steel subjected to a direct re-melting procedure from the as-annealed condition. The role of carbide dissolution in the grain boundary liquation of the steel is described. This leads to the production of near spheroidal solid grains in a liquid matrix, a microstructure suitable for the thixoforming process. Microstructural examination revealed that carbide particles contained in bands at 1220 °C slowly disappeared with temperature. At 1300 °C, the solid grains seemed to be free from carbides. Most of the carbides had now re-precipitated at the grain boundaries. Thixoforming carried out at 1340 and 1360 °C revealed the thixotropic properties of the semi-solid metal slurries. The results indicate a widening of the range of potential routes to thixoformable microstructures.

UR - http://www.scopus.com/inward/record.url?scp=58849125681&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=58849125681&partnerID=8YFLogxK

U2 - 10.1007/s10853-008-3181-1

DO - 10.1007/s10853-008-3181-1

M3 - Article

AN - SCOPUS:58849125681

VL - 44

SP - 869

EP - 874

JO - Journal of Materials Science

JF - Journal of Materials Science

SN - 0022-2461

IS - 3

ER -