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Research Status and Progress Analysis of Titanium Alloy Surface Strengthening Technology 4-6

Nov 09, 2018

Research Status and Progress Analysis of Titanium Alloy Surface Strengthening Technology 4-6

4, laser surface strengthening

The laser cladding is to add a cladding material on the surface of the substrate, and is heated by a high-energy sealing material and a thin layer on the surface of the substrate material to form a melting layer on the surface of the substrate material. The laser-fused ceramic coating can greatly improve the surface performance of the titanium alloy, and the processing speed is fast, and the use range is TiC. Laser surface strengthening of titanium alloy is coated with TiN coating, Ti5 coating, -Si3 ceramic phase to improve surface hardness and wear resistance. The surface hardness of the sample after laser cladding can reach 800 HV to 3 000 HV. Liu [5] and others successfully obtained TiC / Ti functionally graded materials by laser cladding, and the hardness reached about HV 2300, and a good hardness gradient was obtained. However, the surface obtained by laser cladding is generally rough and has a poor finish. Hardening is likely to cause cracking between the cladding layer and the substrate. The melt layer is thin and uneven, pores and cracks may also appear inside the coating, and the equipment is expensive. These limits the further application of laser surface cladding. How to overcome these shortcomings, which can be applied to production practice, will become an important direction for future research.

5. Surface nanocrystallization of titanium alloy

In recent years, nanotechnology has been applied and developed. The surface nanocrystallization of titanium alloys is to refine the surface grain of the material to nanometer scale by various physical or chemical methods to prepare a surface layer with nanocrystalline structure to improve titanium. [6] Surface properties of the alloy. Xi et al. used the electrodeposition method to nano-scale the surface of Ti-48Al - 2Ag material, and obtained the nanostructure of Al2O3 on the surface of the alloy, which significantly improved the corrosion resistance of titanium alloy. Lu Jian et al. prepared a super-large surface nano-material on the surface of the material by high-speed shot peening nanocrystallization. Lu Ke et al. have combined the surface nano-nanoming and nitriding treatments to obtain good results. After nitriding, the nitriding materials have been extremely resistant to corrosion, surface hardness and wear resistance. Great improvement. There is no report on the combination of titanium alloy surface nanocrystallization and other surface treatment processes. It is predictable that the combination of titanium alloy surface nanocrystallization and other surface strengthening methods can achieve good results, which may become a new technology for surface treatment of titanium and titanium alloys.

6, multi-component and multi-layer composite surface treatment

Surface strengthening of titanium alloys If the alloy is alloyed by other compounds or partially or completely replaced by titanium in these compounds, [9] achieves an improvement in surface properties, thus obtaining a multi-component coating. Multi-component coatings can greatly improve the surface properties of titanium and titanium alloys. For example: Ti (C, the layer shows the highest hardness, the layer shows more N than the matrix) TiN (Al) Good adhesion, Ti, N layer shows good high temperature stability. Study (Al) and it can be shown that the life of Ti, N drills is more than twice that of TiN and works at much higher cutting speeds than TiN drills. When Ti is added to TiN, Ti (N, compound, C) is formed, and Ti (C, compound, [10], N), which has extremely high hardness and high temperature resistance, and wear resistance, is obtained. C, layer, the results show that: surface hardness increased from about 200 HV to 2 000 HV. Multi-layer coating can improve toughness, improve corrosion resistance, improve crack resistance and refine grains, etc. For example: TiN and matrix are better The bonding force, in the surface treatment of titanium alloy, a surface of titanium metal may be pre-plated with a layer of ductile (Al) Ti as a spacer layer, then TiC, Ti, N, preferably TiN, (C, , N TiB2 and CrN are plated on the TiN layer to form a multilayer structure. The resulting multi-layer coating can greatly improve the toughness, corrosion resistance and resistance of the coating. The oxidation resistance of TiN / CrN such as Matsuura The performance is higher than single layer TiN, layer CrN. Multi-component coating, multi-layer coating and combination of multi-component and multi-layer coating are becoming the new direction of titanium alloy surface treatment research.

 


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