Study on the microstructure and properties of zirconium alloy electron beam fusion wire additive
The experiments of R6075 zirconium alloy melt deposition were carried out using electron beam fusion wire additive equipment.The microstructure and evolution mechanism of the zirconium alloy melt deposition layer were studied,and the mechanical properties of the melt deposited samples were analyzed.The results showed that the microstructure of R075 zirconium alloy sample deposited by electron beam wire filled melt deposition was dense,and the underlying grains of the deposited structure were fine and dense.As the deposition height increased,the grains increasd.The proportion of small angle grain boundaries in the grain structure of the deposited layer was above 70％,and there was a significant preferential orientation feature in grain growth.The zirconium matrix phase of the molten deposition sample was mainly distributed in lamellar form,and the matrix phase was mainly composed of a-Zr,and there was a phenomenon of segregation of alloy elements such as Hf.The tensile strength of the deposited sample was 535 MPa to 577 MPa,which was significantly greater than the tensile strength of the zirconium alloy in the hot rolled and annealed state(398 MPa).The farther away from the substrate position on the cross section of the deposited samplewas,the higher the hardness of the deposited samplewas.
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