| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Large-Scale Metal Additive Manufacturing
|
| Presentation Title |
Effect of Inhomogeneous Grain Size on the Deformation Characteristics of Bimetallic Additively Manufactured Structure (BAMS) of 316L Austenitic Stainless Steel and Inconel 625 |
| Author(s) |
Rumman Ul Ahsan, Xuesong Fan, Jonathan D. Poplawsky, Peter K. Liaw, Duck Bong Kim |
| On-Site Speaker (Planned) |
Rumman Ul Ahsan |
| Abstract Scope |
Direct energy deposition (DED) processes can fabricate functionally graded bimetallic structures with varied properties as a single component. In this work, a bimetallic additively manufactured structure (BAMS) is fabricated using wire + arc additive manufacturing (WAAM) through sequential deposition of 316L austenitic stainless steel (SS316L) and Inconel 625 (IN625). Although a sharp compositional transition is observed at the interface, elemental segregation or defects are not observed. The tensile testing results in YS and UTS of about 400 and 600 MPa respectively with about 42% elongation, similar to SS316L and failed on the SS316L side. However, due to the deposition conditions, periodically alternating grain sizes (fine, and large- columnar grains) are observed between the layer-interfaces and layers, in both materials and this leads to regions of high a low lateral deformation. Based on dislocation density analysis from electron backscattered diffraction (EBSD) results and TEM analysis, the deformation mechanisms are disclosed. |