研究目的
To develop and analyze suitable parameters for the deposition of single and multi-layers of Ti-6Al-2Sn-4Zr-2Mo powder and examine the parameter transfer to a γ-TiAl alloy to enlarge the possibilities for multi-material structures.
研究成果
Parameter sets for the successful deposition of Ti6242 single and multi-layers were developed, with no or few porosity detected. The process windows of Ti6242 and TNM overlapped, allowing for some crack-free parameter sets for TNM without pre-heating. The study demonstrated the potential for creating multi-material structures with tailored properties for high-temperature applications.
研究不足
The study is limited by the crack-sensitivity of γ-TiAl, which results from thermally induced residual stresses. The process windows for Ti6242 and TNM overlap, but the successful deposition of TNM requires careful parameter selection to avoid cracks.
1：Experimental Design and Method Selection:
The study involves the use of powder-based laser metal deposition (LMD) for Ti alloys, focusing on parameters such as laser power, process velocity, laser focus position, gas flow, and powder feed rate.
2：Sample Selection and Data Sources:
Ti-6Al-4V substrate was used with Ti-6Al-2Sn-4Zr-2Mo and γ-TiAl TNM alloy powders.
3：List of Experimental Equipment and Materials:
A 2200 W Rofin Nd:YAG laser with a laser spot size of
4：3 mm, spherical Ti6242 powder from AP&C, and EIGA gas-atomized spherical TNM powder. Experimental Procedures and Operational Workflow:
Single and multi-layer depositions were performed with varying parameters, followed by visual and radiographic inspection, microstructural analysis, and hardness measurements.
5：Data Analysis Methods:
The analysis included visual inspection, radiography inspection, microstructural analysis, and Vickers microhardness measurements.
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