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Meeting Materials Science & Technology 2019
Symposium Corrosion of Additively Manufactured Metals
Presentation Title Understanding the Influence of Retained Nitrogen in Additively-Manufactured 17-4 Stainless Steel: Does it Really Improve Corrosion Resistance?
Author(s) Mark R. Stoudt, Richard Ricker
On-Site Speaker (Planned) Mark R. Stoudt
Abstract Scope The additive manufacturing (AM) build process is known to introduce microstructural heterogeneities that promote variability in mechanical performance; however, the influence of these heterogeneities on corrosion resistance is not well understood. Wrought SS17-4 is an industrially-relevant heat-treatable alloy with a microstructure of delta-ferrite stringers in a martensite matrix, which generally exhibits high-strength and good corrosion resistance. When atomized in nitrogen, the as-built microstructure is a mixture of alpha-ferrite and austenite that does not readily transform to martensite. While, this substantially reduces the strength, the retained nitrogen has also been shown to enhance the corrosion resistance. Argon-atomized AM17-4 easily transforms to martensite but exhibits significantly higher porosity and reduced corrosion resistance with respect to the wrought alloy. The relationships between post-build heat treatment, microstructure and corrosion resistance were examined in environments with differing solution pH. The corrosion behaviors of wrought, nitrogen-atomized AM17-4, and argon-atomized AM17-4 will be compared and discussed.
Proceedings Inclusion? Definite: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Corrosion of Additive Materials for Naval Applications
Corrosion of Additively Manufactured Stainless Steels – Process, Structure, and Performance
Corrosion Performance of Aluminium Based Functionally Graded Materials Processed by Wire-arc Additive Manufacturing
Effect of Chloride and Heat Treatment on Pitting Corrosion Resistance and Mechanical Properties of a 316L Stainless Steel Manufactured by the Direct Metal Laser Sintering (DMLS) Process
Effect of Surface Finish on the Corrosion Properties of Additively Manufactured Stainless Steel
Electrochemical Characterization of Additively Manufactured Al-10Si-Mg in Standardized Test Solutions
Evaluation of the Corrosion Response of Additively-Manufactured 17-4 PH Stainless Steel Samples as a Function of Build and Finish Parameters
High Temperature Oxidation and Creep Oxidation of Compositionally Graded Alloys in Air and Supercritical CO2: Modeling and Experiment
High Temperature Oxidation of 718 Alloy Produced by Additive Manufacturing
Hydrogen Concentration and Uptake in Additively Manufactured Austenitic Stainless Steels
Improved Electrochemical Response of SLM 316L SS in Physiological Solutions
Issues in Localized Corrosion of Selective Laser Melted 316L
P3-37: Microstructure and Corrosion Behavior of Alloy 625 Produced by Laser Powder Bed Fusion
Surface Damage of an AM-AlSi10Mg Alloy Exposed to Corrosive Environments with Lack of Fusion Defects and Powder Contamination
Surface Preparation of Additively Manufactured Metals and Subsequent Comparison of Corrosion Characteristics
The Effects of Laser Peening Parameters on the Corrosion and Hardness Properties of Ti6Al4V Alloy
Understanding the Influence of Retained Nitrogen in Additively-Manufactured 17-4 Stainless Steel: Does it Really Improve Corrosion Resistance?

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