Effect of laser power on microstructure and mechanical properties of high entropy alloy/316L stainless steel materials
Selective laser additive manufacturing(SLM)fabricated metal matrix composites have many advantages such as flexible structure and controllable composition.In this paper,316L stainless steel was used as the matrix material and Al0.5CoCrFeNiTi0.5 high entropy alloy(HEA)powder was used as the particle reinforcement to study the effect of laser power on the microstructure,micro-nano mechan-ical and macro-mechanical properties of Al0.5CoCrFeNiTi0.5/316L composites during SLM printing.The results show that with the increase of laser power,the forming quality of the composite decreases and the microcracks occur in the composite.The original spherical particles of high entropy alloy do not ex-ist,the elements in the composite are evenly distributed,the fluidity of the adding pool of Al0.5CoCrF-eNiTi0.5 particles decreases,and the remelted zone presents equiaxed crystal distribution.With the in-crease of laser power,the hardness of remelted zone and non-remelted zone increases,and the elastic re-covery rate decreases as a whole.The tensile strength and elongation also decrease with the increase of laser power,and the tensile strength is up to 1136 MPa.The internal strengthening mechanism of Al0 5CoCrFeNiTi0.5 particles is mainly attributed to solid solution strengthening and the fracture form is ductile fracture.
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