Progressive Amplitude Fatigue Performance of Additively Manufactured Stainless Steel Superalloy

• Published in: TMS 2021 150th Annual Meeting & Exhibition Supplemental Proceedings pp. 110 - 117
• Main Authors: Siddiqui, Sanna F., Rivera, Krystal, Ruiz-Candelario, Isha, Gordon, Ali P.
• Format: Book Chapter
• Language: English
• Published: Cham Springer International Publishing
• Series: The Minerals, Metals & Materials Series
• Subjects: Additive manufacturing; Stainless steel GP1; Variable amplitude fatigue
• ISBN: 3030652602; 9783030652609
• ISSN: 2367-1181; 2367-1696
• DOI: 10.1007/978-3-030-65261-6_10

Advances in aerospace component manufacturing design are being achieved through the additive manufacturingAdditive manufacturing (AM) technology. Variations in cyclic loads (i.e. variable amplitude fatigueVariable-amplitude fatigue) is a common phenomenon experienced by aerospace components during in-service use, hence the need for AM components to withstand fatigue failure under these conditions. This study has performed progressive strain amplitude fatigue tests at increasing strain ranges with the intent to capture the fatigue failure life, hardening/softening response, and fracture response of as-built direct metal laser sintered (DMLS) Stainless Steel GP1Stainless-steel GP1. Preliminary results indicate fatigue failure in specimens prior to reaching strain ranges where plasticity effects become more pronounced. Also, evident is variation in cyclic softening/hardening response to stabilization at elastic versus plastic strain ranges. Scanning electron microscopy was used to identify the precursors for fatigue crack initiation and propagation under progressive amplitude fatigue loading.