| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
Understanding Microstructural Complexity in the Additive Manufacturing of Cobalt-Free Maraging Steels |
| Author(s) |
Alec I. Saville, Jake T. Benzing, Cassidy R. Allen, Joseph W. Aroh, Fan Zhang, Jordan Weaver, Jason D. Holm, Nik Hrabe, Nicholas Derimow, Tilman Seifert, Michael Hirtler |
| On-Site Speaker (Planned) |
Alec I. Saville |
| Abstract Scope |
Maraging steels are commonly used in industrial and structural applications for their desirable toughness, wear resistance, and high strengths. Maraging steels achieve these properties through cobalt additions often greater than 10 wt% to form strengthening precipitates. Though effective, cobalt’s historically volatile pricing and unstable supply chains restrict maraging steels to the most extreme and costly applications, limiting the impact of these alloys. Removing cobalt is thus desirable, but reduces the performance of maraging steels by 10-20% and restricts the adoption of cobalt-free alternatives. This work explores using additive manufacturing to by-pass this issue by leveraging non-equilibrium partitioning, metastable phases, rapid solidification, build parameter selection, and new heat treatment processes to bring cobalt-free maraging steels into parity with existing alloys. The complexities of microstructures in new cobalt-free maraging steels, from solidification to solid state nucleation, are discussed, along with mechanical properties to highlight new avenues for advancement in cobalt-free maraging steels. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, Solidification |