Abstract
TC4 Ti alloy with the excellent properties can be applied to many fields, but the surface performance such as wear-resisting, fretting wear, contact corrosion etc.can't be met for many special demands. Laser cladding was applied on a TC4 Ti alloy to improve its properties. Mixed Ni,Ti and Nb powders were put onto the TC4 Ti alloy and subsequently treated by laser beam. The experimental results show that the surface hardness and wear resistance are significantly improved. The increase in wear resistance is predicted to be related to the "adaptive" wear mechanism of SMA.The microstructure and composition modifications in the surface layer were carefully investigated by using SEM, EDX and metallographic microscope. Experimental analyses show that the compositions of laser cladding coating are close to shape memory alloy of 44Ni-47Ti-9Nb,and differedt microstructure are rich with different elements. These experimental results are associated with laser processing techniques and alloy composition to some extent.
Highlights
Titanium and titanium alloys are known as "space metal" or "marine metal" due to their excellent properties,such as outstanding corrosion resistance and high specific strength
Use some rubber balls with a 15:1 pellet ratio and a rotation speed of 200 rpm to ball mill it for 0.5 h, the mixture of powder and alcohol after the ball milling is removed to a beaker.The mill jar and ball are rinsed with alcohol and remaining powder is flushed into the beaker
The 2mm thick TC4 substrate is remove the surface of oil dirt using acetone, the surface of the substrate is polished clean, smooth by sandpaper and dried with a hairdryer blown, Prep 2mm thick powder layer is precasted on TC4 substrate with 2mm self-made squeegee and cladded with Nd:YAG laser, operating parameters setup are 100A current, 5ms pulse width, 15Hz frequency, +20cm positive defocus, 300mm/min scanning speed, and the overlap rate is 50%, and the cladding layer is formed, It can be smoothed with sandpaper
Summary
Titanium and titanium alloys are known as "space metal" or "marine metal" due to their excellent properties,such as outstanding corrosion resistance and high specific strength. Using a high-energy laser beam, the coating material that has been previously coated on or transported to the surface is melted together with the surface of the substrate , rapidly solidified to form a surface coating with a very low dilution ratio and good metallurgical bonding. In this way, the wear resistance, corrosion resistance, heat resistance, and oxidation resistance of the substrate surface are significantly improved[9]
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