扫描策略对激光粉末床熔融W-Ti重合金致密化、残余应力及力学性能的影响

Abstract

Objective Owing to the high melting point, high thermal conductivity, high creep resistance, high physical sputtering rate, and low hydrogen retention of tungsten (W) and its alloys, W has been widely used in the nuclear industry as well as rocket nozzles, medical protection, and other industrial fields. However, W is difficult to process, with a high ductilebrittle transition temperature (DBTT, 200 400 ℃ ). Traditional processing methods, such as powder metallurgy, plasma sintering, and hot isostatic pressing, are unable to realize the formation of complex components from W , limiting its engineering application. Fortunately, the development of laser powder bed fusion (LPBF) additive manufacturing provides a feasible method for fabricating W . In this study, we design a W -Ti heavy alloy and successfully fabricate it using LPBF. We investigate the effects of laser scan strategies on the densification, residual stress, and mechanical properties of LPBFprinted W -Ti heavy alloys, and further optimize the laser scan strategy. We hope that these findings can promote the optimization of laser additive manufacturing of difficulttoprocess W -Ti heavy alloys by elaborating the relationship between the laser scan strategy and the properties of the LPBFfabricated W -Ti alloy.