The peculiarities of structure building in copper/steel bimetal produced by electron-beam additive technology

In present paper, the microstructure of bimetallic compound of heterogeneous materials, CrNiTi stainless steel and С11000 copper, obtained by wire electron-beam additive technology was investigated. Bimetallic compound is characterized by well-defined interface between the two materials and possesses two-phase transition areas on both sides of the interface. The heterogeneity of strength properties (microhardness) in the transition zones is associated with a solid solution hardening of the basic components of bimetal and the formation of composite structures in the transition zone of bimetal: spherical inclusions of steel in the copper section and copper inclusions in the steel section. In the copper part of the bimetallic sample, a heterogeneous grain structure is formed - areas with macroscale non-equiaxed grain structure and zones with spherical grains were observed. The heterogeneity of grain structure does not have a significant influence on a yield strength but affects the macroscopic deformation pattern of copper part of the bimetal, as it was revealed by microstructural analysis of slip traces and grain structure using Hall-Petch relationship.

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