Bi-Metal Injection Molding of Tough/Wear-Resistant Components
Johnson, J. L., Tan, L. K., Bollina, R., Suri, P., & German, R. (2003). Bi-Metal Injection Molding of Tough/Wear-Resistant Components. Advances in Powder Metallurgy and Particulate Materials - 2003, Part 8, Metal Powder Industries Federation, Princeton, NJ. 262-272.
Bi-material components can be processed by MIM by two-color injection molding and co-sintering, but compositions and sintering cycles must be optimized to minimize shrinkage mismatch while providing the desired properties. The effects of sintering temperature on the sintered density, hardness, and mechanical properties of M2 tool steel and boron-containing 316L stainless steel are investigated. The compatibility of co-sintering these materials is predicted based on calculations of the thermal stress and in situ strength of the component during sintering. This prediction is verified by successful Bi-MIM processing of 316L-0.5B stainless steel/M2 tool steel components for applications that require a combination of toughness and wear resistance.