Microstructural evolution in semisolid forging of A356 alloy

Byung Keun Kang, Chun Pyo Hong, Byoung Hee Choi, Young Soo Jang, Il Sohn

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A semisolid forging study using A356 alloy was carried out to investigate the evolution of microstructures affected by the solid fraction, the forging pressure and the addition of Sr. The semisolid slurry for forging was made by an electromagnetic stirring method. Microstructures were evaluated at two typical positions of the semisolid forged specimens: one is the region, where direct forging pressure is applied, and the other is the region, where the slurry was squeezed and extruded indirectly. Microstructural characteristics, such as the morphology of the primary Al particles and the eutectic Si, were changed with the positions observed. As the solid fraction increased, the morphology of the primary Al particles was transformed from rosette-like to globular. As the forging pressure increased, the size of eutectic Si became fine. An increase of the forging pressure is speculated to improve the interfacial heat transfer coefficient between the semisolid slurry and the mould wall, leading to an increase of the cooling rate on the growth of eutectic Si. The addition of Sr is effective in modifying the morphology for eutectic Si, especially when the forging pressure was low.

Original languageEnglish
Pages (from-to)153-158
Number of pages6
JournalMetals and Materials International
Volume21
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

semisolids
forging
Microstructural evolution
Forging
eutectics
Eutectics
microstructure
Microstructure
stirring
heat transfer coefficients
Heat transfer coefficients
low pressure
electromagnetism
Cooling
cooling

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Kang, Byung Keun ; Hong, Chun Pyo ; Choi, Byoung Hee ; Jang, Young Soo ; Sohn, Il. / Microstructural evolution in semisolid forging of A356 alloy. In: Metals and Materials International. 2015 ; Vol. 21, No. 1. pp. 153-158.
@article{7168fd2b1eec4fbdaa54e6bb946b85b0,
title = "Microstructural evolution in semisolid forging of A356 alloy",
abstract = "A semisolid forging study using A356 alloy was carried out to investigate the evolution of microstructures affected by the solid fraction, the forging pressure and the addition of Sr. The semisolid slurry for forging was made by an electromagnetic stirring method. Microstructures were evaluated at two typical positions of the semisolid forged specimens: one is the region, where direct forging pressure is applied, and the other is the region, where the slurry was squeezed and extruded indirectly. Microstructural characteristics, such as the morphology of the primary Al particles and the eutectic Si, were changed with the positions observed. As the solid fraction increased, the morphology of the primary Al particles was transformed from rosette-like to globular. As the forging pressure increased, the size of eutectic Si became fine. An increase of the forging pressure is speculated to improve the interfacial heat transfer coefficient between the semisolid slurry and the mould wall, leading to an increase of the cooling rate on the growth of eutectic Si. The addition of Sr is effective in modifying the morphology for eutectic Si, especially when the forging pressure was low.",
author = "Kang, {Byung Keun} and Hong, {Chun Pyo} and Choi, {Byoung Hee} and Jang, {Young Soo} and Il Sohn",
year = "2015",
month = "1",
day = "1",
doi = "10.1007/s12540-015-1018-4",
language = "English",
volume = "21",
pages = "153--158",
journal = "Metals and Materials International",
issn = "1598-9623",
publisher = "Korean Institute of Metals and Materials",
number = "1",

}

Microstructural evolution in semisolid forging of A356 alloy. / Kang, Byung Keun; Hong, Chun Pyo; Choi, Byoung Hee; Jang, Young Soo; Sohn, Il.

In: Metals and Materials International, Vol. 21, No. 1, 01.01.2015, p. 153-158.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microstructural evolution in semisolid forging of A356 alloy

AU - Kang, Byung Keun

AU - Hong, Chun Pyo

AU - Choi, Byoung Hee

AU - Jang, Young Soo

AU - Sohn, Il

PY - 2015/1/1

Y1 - 2015/1/1

N2 - A semisolid forging study using A356 alloy was carried out to investigate the evolution of microstructures affected by the solid fraction, the forging pressure and the addition of Sr. The semisolid slurry for forging was made by an electromagnetic stirring method. Microstructures were evaluated at two typical positions of the semisolid forged specimens: one is the region, where direct forging pressure is applied, and the other is the region, where the slurry was squeezed and extruded indirectly. Microstructural characteristics, such as the morphology of the primary Al particles and the eutectic Si, were changed with the positions observed. As the solid fraction increased, the morphology of the primary Al particles was transformed from rosette-like to globular. As the forging pressure increased, the size of eutectic Si became fine. An increase of the forging pressure is speculated to improve the interfacial heat transfer coefficient between the semisolid slurry and the mould wall, leading to an increase of the cooling rate on the growth of eutectic Si. The addition of Sr is effective in modifying the morphology for eutectic Si, especially when the forging pressure was low.

AB - A semisolid forging study using A356 alloy was carried out to investigate the evolution of microstructures affected by the solid fraction, the forging pressure and the addition of Sr. The semisolid slurry for forging was made by an electromagnetic stirring method. Microstructures were evaluated at two typical positions of the semisolid forged specimens: one is the region, where direct forging pressure is applied, and the other is the region, where the slurry was squeezed and extruded indirectly. Microstructural characteristics, such as the morphology of the primary Al particles and the eutectic Si, were changed with the positions observed. As the solid fraction increased, the morphology of the primary Al particles was transformed from rosette-like to globular. As the forging pressure increased, the size of eutectic Si became fine. An increase of the forging pressure is speculated to improve the interfacial heat transfer coefficient between the semisolid slurry and the mould wall, leading to an increase of the cooling rate on the growth of eutectic Si. The addition of Sr is effective in modifying the morphology for eutectic Si, especially when the forging pressure was low.

UR - http://www.scopus.com/inward/record.url?scp=84921801718&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84921801718&partnerID=8YFLogxK

U2 - 10.1007/s12540-015-1018-4

DO - 10.1007/s12540-015-1018-4

M3 - Article

VL - 21

SP - 153

EP - 158

JO - Metals and Materials International

JF - Metals and Materials International

SN - 1598-9623

IS - 1

ER -