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Temperature Effects during Impact Testing of a Two-Phase Metal-Ceramic Composite Material

1
Institute of Fundamental Technological Research, Polish Academy of Sciences, PL-02-106 Warsaw, Poland
2
Lublin University of Technology, PL-20-618 Lublin, Poland
*
Author to whom correspondence should be addressed.
Materials 2019, 12(10), 1629; https://doi.org/10.3390/ma12101629
Received: 16 April 2019 / Revised: 13 May 2019 / Accepted: 15 May 2019 / Published: 17 May 2019
(This article belongs to the Special Issue Behavior of Metallic and Composite Structures)
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Abstract

Metal-ceramic composite (MCC) materials can be used for manufacturing high-responsibility structures such as jet engines or cutting tools. One example of these materials is a two-phase wolfram carbide (WC) and cobalt (Co) composite. This MCC is a combination of hard WC grains with a Co metallic ductile binder. The resulting microstructure is a combination of two phases with significantly different mechanical behaviors. In this study, we investigate impact conditions, starting with an illustrative example of the Taylor impact bar where—although the process is very rapid—the equivalent plastic strain and temperature are higher in the adiabatic solution than those in the coupled solution. On exposing the WC/Co composite with a metallic binder to impact loading, heat is generated by plastic deformation. If the process is fast enough, the problem can be treated as adiabatic. However, a more common situation is that the process is slower, and the heat is generated in the ductile metallic binders. As a result, the associated grains are heated due to the conduction effect. Consequently, the process should be treated as coupled. When the impact is applied over a short time period, maximum temperatures are significantly lower if the process is analyzed as coupled rather than as adiabatic. The grains are immediately affected by temperature increase in the binders. Therefore, the heat conduction effect should not be omitted. View Full-Text
Keywords: metal-ceramic composite; impact; coupled problem; thermomechanics metal-ceramic composite; impact; coupled problem; thermomechanics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Postek, E.; Sadowski, T. Temperature Effects during Impact Testing of a Two-Phase Metal-Ceramic Composite Material. Materials 2019, 12, 1629.

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