• 1、School of Metallurgy, Northeastern University, Shenyang, Liaoning 110819

Abstract： In this study, the effect of high-current pulsed electron beam treatment on the surface structure and properties of the dual-phase Zr-17Nb alloy (STAG) obtained by solution aging treatment were investaged. The XRD results show that the original αZr phase precipitates gradually dissolve and undergo phase change with the increase of the number of pulses, and β (Zr+Nb) phase and Nb phase appear after eutectoid reaction. The microstructure morphology analysis results show that the active eutectoid transformation occurs during the phase transition induced by HCPEB treatment and he lamellar pearlite structure is produced, it is attached to the equiaxed crystal elongation and has obvious directionality. The microhardness performance test showed that the microhardness decreased significantly after 5 pulses due to the severe extrusion deformation of the surface after the HCPEB treatment. After 15 and 30 pulse treatment, the eutectoid reaction of the matrix occurred, and resulting in a softer Nb phase, which further reduced the hardness. The friction coefficient performance test showed that the surface friction coefficient decreased significantly after 15 pulse treatments, and the wear resistance increased, which can be attributed to the remelting phenomenon of the alloy surface

Keywords： Zr-Nb alloy High current pulsed electron beam solution aging treatment phase transformation surface modification