Observations on the relationship of structure to the mechanical properties of thin TD-NiCr sheet

Abstract

A study of the relationship between structure and mechanical properties of thin TD-NiCr sheet indicated that the elevated temperature tensile, stress-rupture, and creep strength properties are dependent on grain aspect ratio and sheet thickness. In general, the strength properties increase with increasing grain aspect ratio and sheet thickness. Tensile testing revealed an absence of ductility at elevated temperatures (T>-1144 K). Significant creep damage, as determined by subsequent tensile testing at room temperature, occurs after very small amounts (<0.1 pet) of prior creep deformation at elevated temperatures (1144≤T≤1477 K). A threshold stress for creep appears to exist. Creep exposure below the threshold stress atT≥1366 K results in almost full retention of room temperature tensile properties.