Abstract
Abstract Free-machining additions have been added to ferrous and non-ferrous materials for many years. One explanation of their effect in machining is that they reduce the effective interfacial shear strength between chip and tool. A unique friction test was used to measure the fractional characteristics of Cu2Te, Cu2S and Pb coated SAE 1045 steel-high speed steel materials at room temperature. All the coatings showed a reduction in initial torque requirements and this is cited as evidence of the initial low friction characteristics of the films. During the test the effective shear strength of Cu2Te and Cu2S coated material reached that of the uncoated material while the lead coating continued at a low level. It is suggested that this phenomenon is associated with the brittle behaviour of the compound films.
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