| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
| Presentation Title |
Corrosion Fatigue Characteristics of Laser Powder Bed Fused 316L Stainless Steels in Chloride-containing Solution |
| Author(s) |
Kevin Sangoi, Jie Song, Yao Fu |
| On-Site Speaker (Planned) |
Kevin Sangoi |
| Abstract Scope |
LPBF has been increasingly used in the fabrication of dense metallic structures. However, the corrosion-related properties of LPBF alloys, particularly environment-assisted cracking, like corrosion fatigue properties, are not well understood. The corrosion and corrosion fatigue characteristics of LPBF 316L stainless steels (SS) in 3.5 wt.% NaCl solution investigated using an electrochemical method, high cycle fatigue, and fatigue crack propagation testing will be discussed. It demonstrated significantly improved corrosion properties compared to conventionally manufactured 316L, as reflected by the increased pitting, repassivation potentials, and retarded crack initiation. However, the printing parameters did not strongly affect the pitting potentials. LPBF samples also demonstrated enhanced capabilities of repassivation during the fatigue crack propagation. The unique microstructural features introduced during the printing process are discussed. The improved corrosion and corrosion fatigue properties are attributed to the presence of columnar/cellular subgrains formed by dislocation networks that serve as high diffusion paths to transport anti-corrosion elements. |