Effect of ε martensite on the abrasive resistance of iron-manganese alloys
2002
Optical microscopy, X-ray diffraction, and electron microscopy were used to study structural transformations occurring under the effect of sliding particles of a fixed abrasive (corundum) in the surface layers of iron-(10-40) wt % manganese alloys and of cobalt. The abrasive wear resistance, friction coefficient, and specific wear energy of these materials were determined. Ultradisperse structures (UDS) consisting of the α, γ, and e phases were shown to form in a thin (several microns) layer of the materials. The high content (>30 vol %) of an hcp phase in the UDS of iron-manganese alloys and cobalt was shown to increase surface microhardness but decrease abrasive resistance. This is due to the small resistance of the UDS hcp phases to microcutting and microscratching (plastic edging), which present the main mechanisms of surface fracture under the wearing conditions used.
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