Study of mechanical properties of samples from heat-resistant copper BrKh 0.8 alloy obtained by selective laser melting

Abstract

Selective laser melting (SLM) technology is a promising method for manufacturing complex parts from many metals and alloys. Copper and copper alloys are widely used in industry due to its high thermal conductivity and low resistivity. The use of chromium as an alloying element can increase the heat resistance of copper and its mechanical properties. In this work, samples were made of heat-resistant copper alloy ПР-БрХ to determine their mechanical properties and porosity values. Before the experiments, particle size, morphological and chemical analysis of the powder was carried out. Samples were prepared using the Additive Solutions D250 selective laser melting facility and a multidirectional laser scanning strategy for the powder layer. As a result of the experiments, samples with porosity of less than 5% were obtained. Which were then subjected to tensile tests and computed tomography. However, some samples were subjected to heat treatment. The test results showed that σ0.2 averages 166.3 MPa, σв — 198 MPa, σp — 42 MPa, ψ — 8.9%, δ — 3.2%. It was also revealed that heat treatment of samples leads to a decrease in strength properties while maintaining plastic. The research was conducted under financial support of the Russian Foundation of Basic Research within the framework of the scientific project No. 18-38-00940\19.