Liquid Phase Surface Treatment of Ti-6Al-4V Titanium Alloy by Pulsed Nd:YAG Laser

Abstract

In this paper, liquid phase surface engineering of Ti-6Al-4V titanium alloy using a 400 W average powerpulsed mode Nd:YAG laser has been studied. Optimized parameters of the laser treatment were determined based on the quality and properties of the fabricated surface layers. Optical microscope and scanning electron microscope equipped with EDS analyzer were used to investigate the microstructural and geometrical features of the laser-treated surfaces. In addition, x-ray diffraction method was also applied for phase analysis of the treated layers. The microstructures of the melted zones were mainly consisted of a¢ martensite together with Ti 3 Al intermetallics where a¢ martensite had hexagonal structure with acicular morphology. a¢ martensite transformed to fine a + b structure after tempering at 480°C for 7 h. Microhardness measurements showed approximately two-fold increases in hardness after surface melting (600-630 HV 0.2 ) compared to that of the parent metal (300-350 HV 0.2 ).

Study of the Tribological Properties of Diffusion Coated NiTi Intermetallic on Cp Titanium

“…Despite the high specific strength and almost good corrosion resistance of titanium alloys [1,2], these materials exhibit poor wear resistance and high friction coefficient which restrict their application in items subjected to wearing conditions [3,4]. To overcome these deficiencies, several surface modification techniques like plasma nitriding, ion implantation, physical vapor deposition, liquid phase surface treatments, laser cladding, electroless, gas tungsten arc welding, and pulsed plasma electrolysis have been applied on these alloys [5][6][7][8][9][10][11][12]. The formation of diffusion coatings like nickel titanium compound (NiTi) has also drawn significant attention to combat wear [13][14][15][16].…”

Comparative Tribological Study of NiTi Diffusion Coated Titanium with Pure Titanium

“…Despite the high speci c strength and almost good corrosion resistance of titanium alloys [1,2], these materials exhibit poor wear resistance and high friction coe cient which restrict their application in items subjected to wearing conditions [3,4]. To overcome these de ciencies, several surface modi cation techniques like plasma nitriding, ion implantation, physical vapor deposition, liquid phase surface treatments, laser cladding, electroless, gas tungsten arc welding, and pulsed plasma electrolysis have been applied on these alloys [5][6][7][8][9][10][11][12]. The formation of diffusion coatings like nickel titanium compound (NiTi) has also drawn signi cant attention to combat wear [13][14][15][16].…”