Routes to Spheroidal Starting Material for Semi-Solid Metal Processing

Spheroidal or globular primary phase microstructure is a standard requirement for semi-solid metal (SSM) processing. This type of microstructure improves material formability during processing and allows the production of dense near-net-shape components with detailed geometries. There are many techn...

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Bibliographic Details
Main Authors:	Asnul Hadi, Ahmad, Naher, S., S. N., Aqida, D., Brabazon
Other Authors:	Hashmi, S.
Format:	Book Section
Language:	English
Published:	Elsevier 2014
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/8229/ http://umpir.ump.edu.my/id/eprint/8229/ http://umpir.ump.edu.my/id/eprint/8229/ http://umpir.ump.edu.my/id/eprint/8229/1/Routes_to_Spheroidal_Starting_Material_for_Semi-Solid_Metal_Processing.pdf

id	ump-8229
recordtype	eprints
spelling	ump-82292018-01-22T04:22:21Z http://umpir.ump.edu.my/id/eprint/8229/ Routes to Spheroidal Starting Material for Semi-Solid Metal Processing Asnul Hadi, Ahmad Naher, S. S. N., Aqida D., Brabazon TJ Mechanical engineering and machinery Spheroidal or globular primary phase microstructure is a standard requirement for semi-solid metal (SSM) processing. This type of microstructure improves material formability during processing and allows the production of dense near-net-shape components with detailed geometries. There are many techniques that have been used in order to attain a spheroidal microstructure within the laboratory and industrial settings since the initial discovery of the improved formability provided. The unique forming advantages produced from this type of microstructure are found for both ferrous and non-ferrous materials. Initial laboratory routes for producing semi-solid metal feedstock were based on mechanical stirring methods. In the early 1990’s, semi-solid metal forming was taken on to a greater extent by industry where the main method of feedstock production was electromagnetic stirring. Relatively few large scale aluminium suppliers provided this feedstock to cast houses which in turn formed this into final component geometries. This feedstock was therefore of higher cost than standard aluminium billets and therefore presented a cost barrier to use of the SSM processing route.From the mid-1990’s on, new thermal methods to produce the spheroidal microstructure were developed within which the melt is rapidly solidified and held for a short time in the semisolid state before forming. These techniques allowed for a multitude of small nuclei to be quickly formed and held at a semi-solid temperature during the primary phase spherodised before injection of the material into the mould. Two main advantages of this technique included firstly that the processes had become a single step process and secondly that the technique could be implemented within the cast houses directly rather than requiring purchase of more expensive feedstock and subsequent re-heating. This provided a significant cost reduction for the process and allowed its more widespread use within engineering products. Many research groups have also developed combinations for techniques for production of semi-solid metal feedstock. Though these provide their own individual benefits 4 and drawbacks, these techniques are largely laboratory based due to their higher associated costs. This chapter provides an overview of the techniques that have been used for semi-solid metal feedstock production and provides discussion on the important parameters that need to be well controlled in order to provide the required spheroidal microstructures. Elsevier Hashmi, S. 2014 Book Section PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/8229/1/Routes_to_Spheroidal_Starting_Material_for_Semi-Solid_Metal_Processing.pdf Asnul Hadi, Ahmad and Naher, S. and S. N., Aqida and D., Brabazon (2014) Routes to Spheroidal Starting Material for Semi-Solid Metal Processing. In: Comprehensive Materials Processing. Casting, Semi-Solid Forming and Hot Metal Forming, 5 . Elsevier, Singapore, pp. 135-148. ISBN 9780080965338 http://dx.doi.org/10.1016/B978-0-08-096532-1.00515-X DOI: 10.1016/B978-0-08-096532-1.00515-X
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Asnul Hadi, Ahmad Naher, S. S. N., Aqida D., Brabazon Routes to Spheroidal Starting Material for Semi-Solid Metal Processing
description	Spheroidal or globular primary phase microstructure is a standard requirement for semi-solid metal (SSM) processing. This type of microstructure improves material formability during processing and allows the production of dense near-net-shape components with detailed geometries. There are many techniques that have been used in order to attain a spheroidal microstructure within the laboratory and industrial settings since the initial discovery of the improved formability provided. The unique forming advantages produced from this type of microstructure are found for both ferrous and non-ferrous materials. Initial laboratory routes for producing semi-solid metal feedstock were based on mechanical stirring methods. In the early 1990’s, semi-solid metal forming was taken on to a greater extent by industry where the main method of feedstock production was electromagnetic stirring. Relatively few large scale aluminium suppliers provided this feedstock to cast houses which in turn formed this into final component geometries. This feedstock was therefore of higher cost than standard aluminium billets and therefore presented a cost barrier to use of the SSM processing route.From the mid-1990’s on, new thermal methods to produce the spheroidal microstructure were developed within which the melt is rapidly solidified and held for a short time in the semisolid state before forming. These techniques allowed for a multitude of small nuclei to be quickly formed and held at a semi-solid temperature during the primary phase spherodised before injection of the material into the mould. Two main advantages of this technique included firstly that the processes had become a single step process and secondly that the technique could be implemented within the cast houses directly rather than requiring purchase of more expensive feedstock and subsequent re-heating. This provided a significant cost reduction for the process and allowed its more widespread use within engineering products. Many research groups have also developed combinations for techniques for production of semi-solid metal feedstock. Though these provide their own individual benefits 4 and drawbacks, these techniques are largely laboratory based due to their higher associated costs. This chapter provides an overview of the techniques that have been used for semi-solid metal feedstock production and provides discussion on the important parameters that need to be well controlled in order to provide the required spheroidal microstructures.
author2	Hashmi, S.
author_facet	Hashmi, S. Asnul Hadi, Ahmad Naher, S. S. N., Aqida D., Brabazon
format	Book Section
author	Asnul Hadi, Ahmad Naher, S. S. N., Aqida D., Brabazon
author_sort	Asnul Hadi, Ahmad
title	Routes to Spheroidal Starting Material for Semi-Solid Metal Processing
title_short	Routes to Spheroidal Starting Material for Semi-Solid Metal Processing
title_full	Routes to Spheroidal Starting Material for Semi-Solid Metal Processing
title_fullStr	Routes to Spheroidal Starting Material for Semi-Solid Metal Processing
title_full_unstemmed	Routes to Spheroidal Starting Material for Semi-Solid Metal Processing
title_sort	routes to spheroidal starting material for semi-solid metal processing
publisher	Elsevier
publishDate	2014
url	http://umpir.ump.edu.my/id/eprint/8229/ http://umpir.ump.edu.my/id/eprint/8229/ http://umpir.ump.edu.my/id/eprint/8229/ http://umpir.ump.edu.my/id/eprint/8229/1/Routes_to_Spheroidal_Starting_Material_for_Semi-Solid_Metal_Processing.pdf
first_indexed	2023-09-18T22:05:35Z
last_indexed	2023-09-18T22:05:35Z
_version_	1777414685488840704

Routes to Spheroidal Starting Material for Semi-Solid Metal Processing

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