Examining the properties of low-alloy copper-iron alloy made of secondary materials

Abstract

Low-alloy copper alloys fall in the category of wrought alloys. There exists a large group of low-alloy copper alloys that can be easily cast into billets. Low-alloy copper-iron alloys belong to that group. Commercially pure metals should be used as burden materials for primary smelting of low-alloy copperi ron alloy. Reuse of cast alloys involves utilizing foundry returns. This research aimed at developing a process for utilizing secondary materials (returns, scrap, foundry waste) of low-alloy copper alloy containing 2.65% iron. The authors looked at the mechanical properties and processability of low-alloy copper-iron alloy made of secondary burden materials. It was found that bulk deoxidation with phosphorus should be used instead of diffusion deoxidation with carbon to ensure the required melt quality. A comprehensive study of mechanical and performance properties of the alloy was carried out after waste remelting, which also involved doing X-ray spectral analysis. The chemical composition was analyzed with the help of an X-ray fluorescence spectrometer. Microhardness measurements were carried out on a computerized Vickers microhardness tester. Analysis of the iron and phosphorus distribution after heat treatment revealed dispersed iron inclusions. This explains the growth of microhardness in areas where solid inclusions precipitated. Analysis showed that the alloy made of secondary burden materials has high strength and conductivity, especially after heat treatment. This study confirmed better overall properties of remelted copper alloys containing 2.65% iron.