研究目的
Investigating the effect of TiC additions on the microstructure and microhardness of direct laser clad Ti45Al5Nb0.5Si based titanium aluminide alloy.
研究成果
Addition of TiC leads to formation of defect free microstructures under varied parameters, except a few processing conditions. There is formation of complex carbides in addition to TiC phase in the microstructure. Both the average and maximum microhardness increase with increase in TiC content. Applied power and scan speed have marginal influence in the microhardness of the clad layer.
研究不足
The study did not investigate the influence of individual component on the microhardness improvement in detail. The effect of powder feed rate on the microhardness does not follow any specific trend.
1：Experimental Design and Method Selection:
Direct laser cladding was conducted using a high power (3 kW) fiber optic delivered Nd:YAG laser with a beam diameter of 2 mm using a 3-axis handling system in a layer by layer fashion on Ti-6Al-4V substrate.
2：Sample Selection and Data Sources:
Commercially available Ti45Al5Nb
3：2Si alloy powder and TiC were mixed in a mechanical mixer for 2 hrs at 25 rpm. List of Experimental Equipment and Materials:
High power (3 kW) fiber optic delivered Nd:YAG laser, 3-axis handling system, Ti-6Al-4V substrate, Ti45Al5Nb
4：2Si alloy powder, TiC. Experimental Procedures and Operational Workflow:
The precursor powder mixtures were melted using the laser in a layer by layer fashion to develop a coupon with a dimension of 10 mm x 10 mm x 5 mm.
5：Data Analysis Methods:
The microstructures were characterized by optical microscope and scanning electron microscopy coupled with energy dispersive X-ray microanalyzer. The phases present were analyzed by X-ray diffraction technique. The microhardness was carried out using Vicker’s microhardness tester.
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