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How to reduce holes in high-temperature titanium alloy foil through process optimization

The main methods to reduce holes in high-temperature titanium alloy foil through process optimization include:
• Strictly control the quality of raw materials and smelting purification process
Use high-purity raw materials, combined with advanced smelting technologies such as vacuum induction melting and electron beam melting, reduce the content of harmful gases (such as oxygen, nitrogen, hydrogen) and inclusions, reduce gas elements to below 5ppm, and reduce the possibility of hole generation from the source.

• Optimize hot working process parameters
Avoid uneven organization and hole formation caused by uneven temperature or too fast cooling by reasonably controlling heating temperature, holding time and cooling rate. Especially during rolling and heat treatment, use slow heating and cooling rates (such as heating to 395℃ at 60℃/h, holding for 2 hours, and then cooling to room temperature at 40℃/h) for multi-stage stress relief annealing to reduce microcracks and holes caused by residual stress and deformation.

• Adopting the lamination method and interlayer sintering technology
Through the alternating lamination of titanium foil and aluminum foil, the vacuum hot pressing or discharge plasma sintering process is used to densify the material, eliminate the interlayer pores, improve the overall density and uniformity, and reduce the hole defects.

• Improving processing equipment and cooling technology
Using high-performance tools and high-pressure and high-flow cutting fluid cooling to reduce heat accumulation and work hardening during processing, and avoid the generation of holes or cracks due to local overheating.

• Online monitoring and intelligent control
Using residual stress detection fixtures and process monitoring technology, the stress and deformation in the key process are monitored in real time, and the process parameters are adjusted in time to prevent the generation of holes and defects.

In summary, through material purification, thermal processing process optimization, multi-layer stacking densification treatment, advanced cooling processing technology and intelligent process control, the hole defects in high-temperature titanium alloy foil can be effectively reduced, the density and mechanical properties of the material can be improved, and the needs of high-end applications such as aerospace can be met.