On the Microstructure and Electrochemical Properties of Additively Manufactured Duplex Stainless Steels Produced Using Laser-Powder Bed Fusion
Derui Jiang, N. Birbilis, Christopher Hutchinson, Michael Brameld
Abstract
The microstructure and electrochemical properties of additively manufactured 22Cr duplex stainless steel (DSS) and 25Cr super duplex stainless steel (SDSS) produced by laser-powder bed fusion (L-PBF) are reported herein. The as-built microstructure is fully ferritic, while a 50/50 ferrite-austenite phase ratio was achieved by post heat treatment. The electrochemical response of DSS and SDSS prepared by L-PBF was investigated using cyclic potentiodynamic polarization (CPP) tests in 0.6 M NaCl solution and compared with the wrought counterparts. Both 22Cr DSS and 25Cr SDSS prepared by L-PBF showed comparable electrochemical response to their corresponding wrought alloys at room temperature. The findings herein demonstrate the feasibility of additive manufacturing as applied to DSS.