Examining the Relationship Between Post-Build Microstructure and the Corrosion Resistance of Additively Manufactured 17-4PH Stainless Steel

The performance of wrought and post-build heat treated, additively manufactured SS17-4PH stainless steel was evaluated to determine whether additive processing can produce material with a similar corrosion resistance the alloy in form, establish manufacturing (AM) conditions alter electrochemical required for attack. Samples built by laser powder bed fusion (LPBF) from nitrogen-atomized argon-atomized were treated achieve homogenized, solutionized martensitic microstructure. A sample also minimize influence Cu precipitates. Multicomponent E-pH diagrams constructed three compositions chloride containing environment using equilibrium thermodynamic data elucidate chemical reactions that occur indicate regions where variations passivity would occur. Electrochemical measurements compared behaviors under free pitting resistances environments differing solution pH levels. results revealed nitrogen retained atomization does enhance additively-processed benefit strongest neutral environment. dissolution matrix suppressed activity CuCl3−2 enhanced NH+4 ions at electrode potentials near Epit. This signifies ionic phases surface are influenced both composition conditions.