Defects in Cast Rods Made of a Near-Eutectic Co Alloy before and after Zone Melting
摘要
Abstract
The surface and internal defects of long cast rods made of a near-eutectic 84KKhSR Co alloy using nondestructive testing methods, namely, X-ray computed tomography and metal magnetic memory, and macrostructural and fractographic analyses are analyzed. The main defects in the rods are found to be gas pores and cavities. Zone melting is shown to eliminate these defects. Deep pores and cavities are eliminated during the first remelting, and the second remelting leads to complete elimination of defects and stabilization of geometric dimensions along the rod length.