· IngenierÃa ·
R.M.PILLAI
Regional Research Laboratory (CSIR), India
67th World Foundry Congress
The increasing use of high integrity Al castings for repeated loading
applications warrants improved fatigue properties as well. The principal
cause for the lower fatigue properties and reliability of aluminium castings
is the presence of defects and inhomogenities, which are the preferred
fatigue initiation sites. Hot Isostatic Pressing (HIPing) is a powerful post
casting treatment for eliminating defects like shrinkage porosity and
hydrogen pinholes leading to densification and enhanced mechanical
properties of the castings meant for high performance applications. This
paper brings out the current status of this potent post casting treatment for
high integrity castings including basics of HIPing, its variants and their
pros and cons and its effects on both microstructure and mechanical
properties of aluminium alloy castings.
