| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Multi-material Additive Manufacturing: Processing and Heterogeneous Materials Design
|
| Presentation Title |
Wire-arc Additive Manufacturing of Inconel 740H Superalloy – P91 Steel Bimetallic Structures: Microstructure Characterization and Post-Heat Treatment Design |
| Author(s) |
Soumya Sridar, Xin Wang, Michael A Klecka, Wei Xiong |
| On-Site Speaker (Planned) |
Soumya Sridar |
| Abstract Scope |
Multi-material structures with varying functionality can offer unique solutions to engineering problems. However, joining two materials using additive manufacturing involves perplexing challenges such as cracking and segregation. In this study, bimetallic structures of Inconel 740H (IN740H) superalloy and P91 steel were fabricated using wire-arc additive manufacturing. The gradient zone was found to be devoid of any deleterious phases. Intergranular cracks were observed in the gradient zone if P91 is printed on top of IN740H, possibly due to the mismatch in thermal conductivity. Therefore, the deposition of IN740H over P91 is the optimum printing sequence for obtaining a defect-free build without an observable brittle phase. Further, the post-heat treatment schedule was designed for IN740H deposited over P91, using experiments and thermodynamic calculations. |