Dual-metal laser powder bed fusion of iron- and cobalt-based alloys

• Published in: Materials characterization 2021-08, Vol.178, p.111285, Article 111285
• Main Authors: Chadha, Kanwal, Tian, Yuan, Pasco, Jubert, Aranas, Clodualdo
• Format: Article
• Language: English
• Subjects: Dual metal LPBF; Laser powder bed fusion; MP1; MS1
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2021.111285

A dual-metal laser powder bed fusion (LPBF) of cobalt-chrome‑molybdenum-based superalloy and maraging steel has been carried out using an EOS M290 machine. The ideal orientations of the dual-metal material were established using an electron backscatter diffraction (EBSD) technique. Three sections were analyzed: a) the cobalt-based alloy area, b) the iron-based alloy area, and c) the interface between the iron- and cobalt-based alloys. A strong 〈110〉||building direction (BD) fiber texture dominates the cobalt-based material, while the iron-based alloy exhibits 〈111〉||BD and 〈100〉||BD fiber textures. The texture in the interface changes from 〈100〉||BD at the bottom of the interface (close to maraging steel section) to ||BD at the top section (near the cobalt-chrome‑molybdenum-based superalloy section). Moreover, the diffusion calculations suggest a negligible diffusion depth in the interface, which avoids any possible formation of detrimental intermetallics. The information from this work can be utilized to control the texture of the dual-metal LPBF material to optimize various physical and mechanical properties while ensuring that no unwanted solid solution alloying takes place along the interface. •Dual metal iron- and cobalt-based alloy was fabricated via laser powder bed fusion.•Orientations of MS1/MP1 during LPBF was established by means of EBSD analysis.•Diffusion suggests a negligible diffusion depth in the interface of dual metal.