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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.
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 builtby 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.
UNS N07718 (Alloy 718) is a precipitation-hardened Nickel alloy widely used for various components in oil and gas production service where a combination of high strength, good cracking and corrosion resistance is needed. API 6ACRA provides heat treatment windows and acceptance criteria for wrought Alloy 718 in these oil and gas production environments, in which the heat treatment is intended to obtain high strength desired for applications in combination with good environmental performance.
Additive Manufacturing (AM) is increasingly becoming a source of design, fabrication of complex components where machining from wrought material would be very cumbersome or introduced complicated welding processes.
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