On the Additive Manufacturing of Alloy 718 for Meeting the Standard Industry Hydrogen Sulfide Requirements

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Over the past twenty years, additive manufacturing (AM) has gradually emerged as an important commercial manufacturing technology for the production of components, particularly complex and highvalue metallic components. AM enables the layer-by-layer rapid manufacturing of near-net shapes using 3D computer-aided design data and typically minimizes raw-material wastes.

Product Number: 51323-18809-SG

Author: Bing Han, Manuel Marya, Srinand Karuppoor

Publication Date: 2023

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The Additive Manufacturing (AM) of Alloy 718 oilfield components by Powder Bed Fusion - Laser (PBFL) is attractive from lead-time and sustainability standpoints. For this investigation, AM 718 coupons built
by PBF-L were acquired from four AM commercial providers. Powder composition, post-processes, microstructures, and mechanical properties of AM 718 were evaluated using standardized test coupons. Resistance to sulfide-stress-cracking (SSC) was measured using (a) NACE TM0177 Method A and Method C tests in NACE MR0175 Level III (including with galvanic coupling) and Level VII conditions and (b) slow-strain-rate tests (SSRT) per NACE TM0198 in a Level VII environment. Also, with the collected dataset, the cracking resistance and failure mechanisms of AM 718 in sour environments were compared against its wrought counterpart from API Specification 6ACRA 718. Through new test results, this paper discusses the important parameters that optimize AM 718 for further Oil & Gas utilization and determines that the variability in AM 718 properties can be managed, overcome, and optimally meet the API Specification 6A CRA minimum requirements with the proper processing route.