Effect of Mold-Steel Interface Reactions of Casting Surface and Properties
Final rept. 1 Jul 1963-31 Jan 1968
CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF METALLURGY
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A means of measuring the tensile strength of molding materials at elevated temperatures was developed and the results of this test permit qualitative evaluation of the ability of a mold material to casting dimensions. The effect of mold materials and binders and mold washes on the dimensional behavior, surface finish and fatigue strength of high strength steel castings was determined. Close dimensional control was obtained with all aggregates bonded with sodium silicate and with the zircon and mullite aggregate bonded with western bentonite. Test specimens made in both hexachlorobenzene coated silica sand molds and zircon sand produced equivalent results in improving the surface finish of experimental test castings. Bending fatigue test results showed that hexachlorobenzene coated and uncoated zircon provided the greatest overall improvement in fatigue life and endurance limit. Completely machined bending fatigue specimens result in only slight improvements in fatigue compared to sand blasted hexachlorobenzene and zircon specimens with the original cast surfaces.
- Metallurgy and Metallography
- Fabrication Metallurgy