抄録
The goal of the study is to fabricate laminated WC-Co cutting tool inserts with residual thermoelastic stress states tailored to counteract the thermal and mechanical stresses imposed during the machining process. Advanced ceramic processing was employed to produce cutting tools with a graded weight fraction of cobalt. Spark plasma sintering (SPS) was utilized for densification of the laminated tools at sub-eutectic temperatures over short times in order to maintain nanocrystallinity and to prevent homogenization of the graded cobalt structure. Microstructural defects found in laminated tools sintered by other methods, such as hot pressing, were not observed in SPS tools. Laminated tools showed improved performance in interrupted cutting of Titanium-6Al-4V alloy when compared to the best performing, commercially available tools. The effect of SPS on microstructural development, mechanical properties, and the resultant machining performance will be presented. Supported by the Center for Innovative Sintered Products at Penn State.
