Paper Title:
Substructures and Fatigue Crack Growth in HIPing and Semi-Liquid Die Casting A356 Alloys
  Abstract

Permanent mold and semi-liquid die A356 cast alloys were used to examine the roles of microstructures and aging conditions on fatigue crack growth. HIP treatment to the A356 alloy generates substructure like dendritic arm boundaries as well as reduction of pores, which improves fracture elongation and fatigue fracture toughness. The similar substructure occur at primary α-Al and inter Si particles of semi-liquid die cast, too. Fracture elongation of HIPed permanent mold cast is comparable to that semi-liquid die cast, the fatigue crack growth is faster than in semi-liquid die cast. Plastic hardening occurs around fatigue crack flank, which decreases fatigue crack growth rate, and such effect appears highly in under aged alloy.

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
469-474
DOI
10.4028/www.scientific.net/MSF.539-543.469
Citation
S. W. Han, H. M. Lee, "Substructures and Fatigue Crack Growth in HIPing and Semi-Liquid Die Casting A356 Alloys", Materials Science Forum, Vols. 539-543, pp. 469-474, 2007
Online since
March 2007
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Price
$32.00
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