A STUDY OF THE EFFECT OF SOLIDIFICATION IMPERFECTIONS ON THE TENSILE PROPERTIES OF CAST STEEL.
WATERVLIET ARSENAL N Y
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The need for a correlation between mechanical properties and imperfection size as determined by radiographic standards has greatly increased. This investigation was initiated to establish such a correlation with cast 4140 steel heat treated to a strength level of 180,000 to 200,000 psi. Solidification imperfections of both gas and shrinkagetype were studied. A least squares statistical regression analysis has shown that tensile strength decreases linearly as imperfection size increases. No significant difference between the two types of imperfections in reducing the tensile strength was noted. From the results of this investigation a practical method can be devised for establishing radiographic standards for castings. Author