LDASCLearning Disabilities Association of Simcoe County (Ontario, Canada)
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The use of LDASC has significant control over the resulting microstructure and physical properties of thin-wall castings.
The effects of LDASC additions on ductile iron microstructure were shown most dramatically in the thin-wall manifold casting in the 0.
2-mm) section and plotted against the volume percentage of LDASC in contact with the casting.
Researchers also have performed tensile tests on samples cut from thin-wall ductile iron castings produced with varying amounts of LDASC.
To address those difficulties, LDASC gate extensions were developed for thin-wall castings.
25 x 12-mm) bars of 100% LDASC as inserts on the mold surface.
Photomicrographs were taken in the thin sections 180 degrees from the flanges and showed the effects of reduced solidification and cooling rates with increased levels of LDASC.
The casting produced with a 100% LDASC mold and core was completely free of carbides and had a microstructure typical of a much heavier section.
The casting hardness decreased dramatically in the thin sections with increasing LDASC levels.
The 25% LDASC blends appeared to have minimal affect on structures and properties, but both the 50% blend and 100% LDASC had significant effects.
To evaluate the effects of LDASC in eliminating misrun vanes, cores were made with 100% LADSC and a 50/50 sand/LADSC by volume blend with silica sand.
All of the cores that contained LDASC eliminated misruns, even at normal pouring temperatures.