Effect of casting over-pressure on the fatigue resistance of aluminum alloy A356-T6

M. A. Neri, D. R. Poirier, R. G. Erdmann

Research output: Contribution to conferencePaper

Abstract

The fatigue resistance of an Al-Si casting alloy (A356) solidified under pressures up to 20 atm and under a vacuum was investigated. Pressures of 10 and 20 atm mitigated microporosity in plate-castings, and this enhancement significantly improved fatigue resistance. Cooling rate during solidification, which affects the dendrite arm spacing (DAS), was also varied. Also studied were Sr-modification and the use of a flux to capture oxide-bifilms. Fatigue life increased as the maximum pore size decreased, which resulted from the over-pressures and/or a decrease in DAS. The use of flux in the mold and Sr-modification, especially when employed simultaneously, also increased fatigue life.

Original languageEnglish (US)
Pages275-282
Number of pages8
StatePublished - Dec 1 2007
EventSHAPE CASTING: 2nd International Symposium - Orlando, FL, United States
Duration: Feb 25 2007Mar 1 2007

Other

OtherSHAPE CASTING: 2nd International Symposium
CountryUnited States
CityOrlando, FL
Period2/25/073/1/07

Keywords

  • Aluminum casting alloy
  • Fatigue
  • Microporosity
  • Pressure casting

ASJC Scopus subject areas

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

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