Abstract
The hardness, phase and microstructural development of Nb-18Si-24Ti-2Cr-2Al (at.%) alloys processed by electron beam surface melting (EBSM) and subsequent heat treatments were investigated. The EBSM experiments were performed using an electron beam based 3D printing system. Results showed that Nbss and Nb3Si phases were obtained via EBSM with a significantly refined microstructure. The eutectoid reaction of Nb3Si→Nbss+αNb5Si3 was triggered by heat treatments (HT) at 1200°C or 1450°C for 5h. The growth and the coarsening of αNb5Si3 grains were promoted with a higher HT temperature. The hardness of the EBSM alloy was remarkably reduced by HT.
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