| Abstract Scope |
Selective Laser Melting (SLM) is a proven production technology in many industries. The Oil & Gas (O&G) industry, however, been a slower adopter. Research efforts are therefore directed towards proving SLM material reliability in demanding O&G service conditions. Investigations have focused on Ni-alloys, valued in O&G applications for their high strength, excellent thermal stability, and tailored corrosion resistance. Testing to date has largely been conducted on SLM-produced specimens with reworked surfaces, the results of which may not be extensible to parts with as-printed surfaces. High roughness from the SLM process likely has a significant impact on the dynamic behavior of SLM-produced materials. In this study, the fatigue behavior of SLM UNS N07718 under a variety of surface conditions, including as-printed, machined, shot-peened, and micro-machined, is investigated. Results from rotating-bending fatigue testing confirmed the negative influence of the as-printed surface on fatigue performance but showed other surface conditions to be promising. |