Erosion wear resistance of titanium-matrix composite Ti/TiN produced by diode-laser gas nitriding

Abstract

A prototype experimental stand equipped with a novel high-power direct diode laser (HPDDL), characterized by unique properties of the laser beam, was applied for producing titanium-matrix composite (TMC) surface layers during the laser gas nitriding (LGN) of the titanium alloy Ti6Al4V in the liquid state. The erosion wear characteristic of the substrate and nitrided surface layers was investigated. It was found that the erosion wear resistance of the composite surface layers is significantly higher than the substrate of titanium alloy Ti6Al4V. The erosion wear resistance depends on the angle of incidence. Reducing the angle of incidence decreases the weight loss of the composite surface layers and simultaneously increases the weight loss of the Ti6Al4V. It was found that the weight loss of the composite surface layer with the highest resistance is over six times lower compared to the Ti6Al4V, at an incident angle of 15°. Keywords: laser nitriding, titanium alloy, diode laser, erosion wear, composite Prototipno eksperimentalno stojalo opremljeno z novim diodnim laserjem velike mo~i (HPDDL), zna~ilnem po edinstvenih lastnostih laserskega`arka, je bilo uporabljeno za izdelavo povr{inske plasti kompozita na osnovi titana (TMC), med plinskim nitriranjem z laserjem (LGN) titanove zlitine Ti6Al44V, v staljenem stanju. Preiskovane so bile zna~ilnosti erozijske obrabe podlage in nitrirane povr{ine. Ugotovljeno je bilo, da je odpornost na erozijsko obrabo kompozitne povr{inske plasti ob~utno ve~ja v primerjavi s podlago iz titanove zlitine Ti6Al4V. Odpornost na erozijsko obrabo je odvisna od vpadnega kota. Zmanj{anje vpadnega kota zmanj{uje izgubo te`e povr{inke kompozitne plasti in hkrati pove~a izgubo te`e Ti6Al4V. Ugotovljeno je, da je izguba te`e kompozitne povr{inske plasti, z najve~jo odpornostjo, pri vpadnem kotu 15°, ve~kot {est krat manj{a v primerjavi z Ti6Al4V.

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