Two-Component Metal Injection Moulding of Ti-6Al-4V and Stainless Steel Bi-Material Parts

Abstract:

Two-component metal injection moulding (2C-MIM) allows producing functionally graded metal parts of complex shape by co-sintering. Until now several studies have demonstrated that different material properties can be combined. Another promising material combination is titanium and iron-based materials. It can combine the biocompatibility and low density of titanium with a ductile and cost efficient stainless steel. However, co-sintering these materials reveals challenges due to a significant mismatch in sintering shrinkage and limitations in sintering temperature for both materials. The recent study showed that Ti-6Al-4V can be joined to the stainless steel 316L by 2C-MIM provided that certain constraints are taken in account. The quality of the interface before and after co-sintering is a crucial factor for intact parts after processing. By applying sinterdilatometry the mismatch in shrinkage was compensated by using adjusted powder characteristics and tailored feedstock compositions. A co-sintering cycle was defined with regard to the sintering characteristics of both materials. The developed two-component specimens revealed significant interdiffusion of alloying elements at the Ti-6Al-4V / 316L interface and a tensile strength of 282 MPa after co-sintering.

• Periodical: Key Engineering Materials (Volume 704)
• Pages: 148-154
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.704.148
• Online since: August 2016
• Authors: Marco Mulser*, Frank Petzoldt
• Keywords: Interdiffusion, Interface Characterisation, Stainless Steel, Ti-6Al-4V, Two-Component Metal Injection Moulding

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