About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing, Directed Energy Deposition of Metals: Processing – Microstructure – Mechanical Property Relationships
|
| Presentation Title |
Very High Cycle Fatigue Behavior of Wire Arc Additively Manufactured Nickel Aluminum Bronze in Ambient Air and Corrosive Environments |
| Author(s) |
MohammadBagher Mahtabi, Meysam Haghshenas, Mojtaba Roshan, Wiktor Bednarczyk |
| On-Site Speaker (Planned) |
MohammadBagher Mahtabi |
| Abstract Scope |
Wire Arc Additive Manufacturing (WAAM) is an efficient, cost-effective method for producing large metal components. Nickel aluminum bronze (NAB), valued for its high strength and corrosion resistance, is widely used in marine environments. This study investigates the very high cycle fatigue (VHCF) behavior of WAAM NAB under ambient air and corrosive conditions. Ultrasonic fatigue testing at 20 kHz enabled accelerated fatigue assessment up to 10⁹ cycles. Distinct failure mechanisms were observed: in air, cracks initiated from internal defects; in corrosion, cracks consistently began at the surface due to pitting, leading to a notable reduction in fatigue life. A step in the S-N curve indicated a transition to secondary fatigue strength in the VHCF regime. The results highlight the critical role of environment in fatigue behavior and confirm ultrasonic fatigue testing as a rapid tool for evaluating WAAM components in harsh conditions. |