Corrosion behavior of FeCrNi medium-entropy alloy fabricated by laser powder bed fusion
Ao Fu, Yuankui Cao, Zhengyan Zhou, Jian Wang, Khashayar Khanlari, Bingfeng Wang, Bin Liu
Abstract
The corrosion behavior of the FeCrNi medium-entropy alloy (MEA), additively manufactured using laser powder bed fusion (LPBF), were investigated in this research. Compared with the LPBF 316 L stainless steel (SS), the LPBF FeCrNi MEA shows a superior corrosion resistance in the 3.5 wt% NaCl solution. The Cr 2 O 3 -rich passive film formed on the LPBF FeCrNi MEA has fewer defects, better self-repairing ability, and consequently a stronger protective property than that of the LPBF 316 L SS. The high value of Cr/Fe ratio in the passive film, caused by the supersaturated Cr (>30 at%) and the refined microstructure (increased grain boundary density), is the main reason for the superior corrosion resistance of the LPBF FeCrNi MEA.