47 - Literature Summary - Deteriorated Graphite in Casting Surfaces

Abstract:

DIS Research has shown that a considerable drop in the fatigue life of ductile iron castings occurs when there are surface defects or deteriorated graphite in the skin of castings. Papers demonstrate this can be due to reactions with the mold or cores due to the presence of S from seacoal or binder systems, oxygen such as moisture in greensand, or N bearing gases from some sand binder systems. Other researchers have studied additional surface quality issues that impact properties. Means to minimize or eliminate these issues have been proposed.