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Wear Progress of Nitrided Layer at Low, Medium and High Contact Pressures During a Laboratory Simulation of Aluminium Hot Extrusion

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Abstract

The progress of wear associated with the compound and diffusion layers of nitrided samples was studied by employing laboratory tests at low, medium and high contact pressures, simulating the conditions occurring during the hot extrusion of aluminium. It was found that with increasing of contact pressure also wear rates increase that indicates on predominately frictional removal of compound layer which was confirmed by scanning electron microscopy and back-scattered electron micrographs as well as energy-dispersive spectroscopy analysis of tested surfaces. Testing at medium contact pressures reveals some common features observed at testing at lower as well as at higher contact pressures. The essential difference between the testing at medium and low contact pressures is in the density of the obtained micro-craters and appearance of their extension in sliding direction at medium contact pressures. At higher contact pressure, removal of compound layer is already preferentially oriented in sliding direction in the first stage, while at medium contact pressure, this is observed only in later stages of degradation progress.

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Notes

  1. Note that some authors [4345] consider chemical reaction, i.e. when two materials form compound at the joint, as chemical adhesion. In this work clear distinction between chemical reaction as individual wear mechanism and other mechanisms of adhesion was made.

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Terčelj, M., Peruš, I. & Kugler, G. Wear Progress of Nitrided Layer at Low, Medium and High Contact Pressures During a Laboratory Simulation of Aluminium Hot Extrusion. Tribol Lett 55, 69–81 (2014). https://doi.org/10.1007/s11249-014-0333-0

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