Developing a Nicocrmo0.2 Medium Entropy Alloy by Laser Additive Manufacturing and its Application on Agitator Blades in Acid Reactor

Abstract

To improve the service life of agitator blades in the phosphoric-acid reactor, the NiCoCrMo0.2 medium entropy alloy (Mo0.2 MEA) was designed by cluster-plus-glue-atom model, and successfully prepared on 304L stainless steel by additive manufacturing (LAM). The Mo0.2 MEA is composed of FCC solid-solution dendrites and a few tiny μ phases. The Mo0.2 MEA possesses higher microhardness compared with the Mo-free counterpart. Moreover, the lowest Icorr value and the largest impedance radius demonstrate the Mo0.2 MEA exhibits better corrosion resistance than that of 904L steel, primarily ascribed to a dense and stable passive film comprising MoO3 and Cr2O3.

Keywords: Medium entropy alloy, Cluster-plus-glue-atom model, Laser additive manufacturing, Erosion resistance.