| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Agile Additive Manufacturing by Employing Breakthrough Functionalities
|
| Presentation Title |
Radial Bimetallic Structures Via Wire Arc Additive Manufacturing |
| Author(s) |
Lile Squires, Ethan Roberts, Amit Bandyopadhyay |
| On-Site Speaker (Planned) |
Lile Squires |
| Abstract Scope |
Radial bimetallic structures were produced using hybrid wire arc additive manufacturing (H-WAAM). Specimens with a 308L stainless core surrounded by a mild steel casing were built by integrating a 3-axis CNC mill with two independently controlled DC welders. The concentric bimetal interface was maintained continuously in the Z-direction. Compressive strength increased to 42% over monolithic controls, and sectioning revealed a distinct pattern of interlocking wedges. Microstructural grain growth transcended interface boundaries and correlated to reduced plastic deformation under compressive loads. A slight CTE mismatch between the interlocking wedges was a mechanism for the buildup of residual pressure during simultaneous cooling. This results in effect similar to the function of cable tendons used in pre-tensioned concrete, with enhanced crack resistance and reduced plastic deformation. Such findings provide a basis for advanced structural design in WAAM fundamentally different from anything possible in linear or stratified depositions. |