In the high-end equipment field represented by aerospace, there is a huge demand for high-temperature resistant metal materials manufacturing and application technology. High-temperature titanium alloys have become aerospace, aerospace, and aerospace industries due to their excellent heat resistance, high specific strength, and good corrosion resistance. The preferred new generation of high temperature and high performance structural materials for ships and so on. Due to the particularity of the high-temperature titanium alloy process performance and the relatively high material cost, when manufacturing more complex shapes and thin-walled special-shaped components, the use of traditional processes has the problems of long manufacturing cycles, low material utilization, and high manufacturing costs. Development of new forming manufacturing processes.

解决 In order to solve the above problems and better meet the demand for high-performance structural materials in the aerospace field, Xinjinghe Laser Technology Development (Beijing) Co., Ltd. (hereinafter referred to as Xinjinghe) has continued to carry out a lot of technical research and development work since 2017. Laser deposition additive technology for high-temperature titanium alloy material forming and manufacturing can achieve low-cost and rapid overall forming of large and complex structural parts, greatly improve material utilization, and save mold cost and processing cycle, which can be well adapted High-end equipment requires fast response and intelligent manufacturing.

Holmium laser deposition additive manufacturing process principle

Laser deposition additive manufacturing technology (LMD) uses a high-power laser as the energy source and uses the powder synchronous feeding method to directly send the powder to be melted into the molten pool generated by the high-energy beam laser. The machine or robot guides the high-energy beam laser. Walking layer by layer and following the trajectory, the layers are stacked layer by layer to finally form a three-dimensional three-dimensional metal component. Laser deposition additive manufacturing can precisely control energy input, spot diameter (melt channel width), forming method, scanning path and layer thickness, and realize the forming and manufacturing of metal parts with any complex shape. This process has the advantages of high efficiency, low cost and high quality when manufacturing large complex high-performance structures. Therefore, it is of great theoretical significance and practical value to study the laser melting deposition manufacturing technology of high temperature titanium alloy materials.

The Xinxin R & D team first started with the matching of materials and processes, and studied and mastered the suitability of laser deposition additive technology for serialized high temperature titanium alloy materials with a temperature resistance above 600 ℃. At the same time, Xinjinghe cooperated with the Institute of Metal Research of the Chinese Academy of Sciences, the Third Academy of Aerospace Science and Industry and other units to form a strong alliance, and developed high-temperature titanium alloy grades such as Ti60, Ti65, Ti750 and titanium alloy-based composite materials above 800 ° C. Development, process exploration and design and application technology research, especially through the six-feed powder head spraying a variety of different alloy elements and composite materials at the same time, the traditional smelting process, such as segregation and refractory and multi-gradient temperature smelting difficulties, etc. Solve the problem of technological limitations in material development.

After a long-term technical research, the R & D team of Xinxin Jinghe Company broke through the laser deposition manufacturing technology of high temperature titanium alloy materials above 600 ℃ and mastered the additive manufacturing process of serialized high temperature titanium alloy materials. The technical team developed a high-temperature titanium alloy material partition forming strategy and a negative overlap Great Wall scanning strategy, combined with the reasonable control of the overlap rate parameters, and added active metal powder during the laser deposition additive manufacturing process to eliminate high-temperature titanium Tiny defects that may occur during the laser deposition of the alloy achieve high-performance and high-reliability forming manufacturing of high-temperature titanium alloys. Xinjinghe has developed and manufactured high-temperature titanium alloy products above 600 ℃ using Tianjin LM-S2510 laser deposition forming equipment, which has been installed in some aircraft models.

 Appearance of laser deposition forming parts of high temperature titanium alloy material (without surface treatment)

Microstructure and morphology of high temperature titanium alloy laser deposition forming (left: before optimization right: after optimization)

Yun Xin Jinghe R & D team used the above technology to manufacture the internal structure of high-temperature titanium alloy components with dense and uniform defects, controllable defects, flat and uniform appearance, high strength, high temperature resistance, and comprehensive performance. Take a certain grade of high-temperature titanium alloy as an example, the tensile strength of room temperature of additive manufacturing parts reaches 1080MPa, the yield strength reaches 980MPa, the elongation reaches more than 10%, the impact toughness αKU reaches more than 30J / cm2, and the tensile strength at 600 ℃ can reach 700MPa. , The yield strength reaches 560MPa and the elongation reaches 20%; the high-temperature tensile strength at 650 ℃ reaches 640MPa, the yield strength reaches 500MPa and the elongation is close to 30%; the high temperature under the stress of 600 ℃ 450MPa lasts for more than 30h; The high-temperature endurance averages more than 15h and has a high fracture toughness value KIC.

High-temperature titanium alloy materials manufactured by holmium laser deposition additive with its good comprehensive properties, especially excellent high-temperature performance above 600 ℃, are expected to have wide application prospects in various industries such as aerospace, shipbuilding and chemical industry. Xinjinghe joins hands with domestic superior technical forces to provide more powerful high-performance materials and process technical support for China's high-end equipment manufacturing field.

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