EFFECT OF MOLD-STEEL INTERFACE REACTIONS ON CASTING SURFACE AND PROPERTIES.
Interim rept. 1 Jul 65-30 Sep 66,
CASE INST OF TECH CLEVELAND OHIO DEPT OF METALLURGY
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The research investigated the effect of mold coatings and refractories on the surface quality of cast steel. The influence of surface roughness in reversed bending fatigue was also examined using as-cast specimens of AISI 4330 steel produced in green sand molds coated with hexachlorobenzene, aluminum powder, sodium floroaluminate, and a proprietary mold wash. Plate bending specimens were also produced in uncoated silica, chromite and zircon sand molds and subsequently tested. 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. The fatigue failures were initiated at cope surfaces with greater frequency than drag surfaces. Author
- Properties of Metals and Alloys