· Aleaciones ligeras ·
J T Staley *, M Tiryakioğlu **, J Campbell ***
*Chicago Laboratory, USA, ** Robert Morris University, USA, *** The University of Birmingham, UK
67th World Foundry Congress
Many aluminum castings contain bifilms, which are cracks that lower the
mechanical properties and reliability of castings. The current commercial
hot isostatic pressing (HIP) process has proven successful in closing
porosity but its success in healing bifilms is questionable. This research
investigates the effects of different HIP conditions on the reliability of
aluminum castings affected by bifilms. Non-HIPed, typical HIPed, and
experimentally HIPed A206 castings with bifilms were mechanically tested
and microstructurally examined. As a result of HIP, minimum tensile
strength increased by nearly a factor of 3, average elongation improved by
up to 8 times, and elongations increased from a maximum of 5 to over 18
percent. However, the elongation reliability essentially did not change as
a result of HIP, which suggests that healing of bifilms did not occur.
