WEB Wear resistance of in-situ composite materials produced by DED for cutting tooling applicationsFriday (25.09.2020) 12:05 - 12:20 P: Processing and Synthesis 2 Part of:
The hardness of a material has been associated with its wear resistance, an important property for many tool applications, such as cutting tools. Laser Based Additive Manufacturing (LAM) processes have been applied for various tooling applications, such as bulk and hybrid parts or thick coatings. These processes present the possibility to produce parts of ultrafine microstructure, which is generally linked to high strength. It has also been demonstrated that ultrafine eutectics, as well as in-situ composites, are suitable candidates for this kind of applications. The goal of this report is to assess the wear properties of two different materials produced by Directed Energy Deposition (DED) (i) an ultrafine Fe-17.6at.%Ti eutectic and (ii) a carbide containing in-situ composite produced from powder mixtures of Fe-12.0at.%Ni-10.0at.%Ti and VC. The two materials were compared to a DED produced reference High Speed Steel (HSS) M2, which is typically used for applications requiring high wear resistance. The samples were micromechanically examined in terms of instrumented microindentation and Pin-on-Disk wear testing. The microstructure and the wear tracks were examined using Scanning Electron (EDS and EBSD) and Light Digital Microscopy, and the predominant wear mechanisms were identified. The binary eutectic samples consist of a lamellar microstructure consisting of bcc α-Fe and hexagonal intermetallic Laves Fe2Ti phases. The composite samples display fine (Ti, V)C-particles dispersed in the bcc matrix. Finally, the M2 HSS samples display a martensitic microstructure. In this presentation the wear mechanisms in relation to the microstructure of the materials are being presented.
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