High-temperature titanium alloy, with excellent thermal strength, high specific strength and good corrosion resistance, has become the new generation of high-temperature and high-performance structural materials preferred in the high-end equipment fields such as aviation, aerospace and ship. However, due to the particularity of the high-temperature titanium alloy process performance and relatively high material cost, in the manufacture of more complex shapes and thin-walled profiled components, the use of conventional process manufacturing has problems such as long manufacturing cycle, low material utilization rate, and high manufacturing cost. There is an urgent need to develop new manufacturing processes.
In order to solve the above problems and meet the demand for high-performance structural materials 3D printing, Xin Jinghe Laser Technology Development (Beijing) Co., Ltd. (hereinafter referred to as Xin Jinghe) has been carrying out a large number of technical research and development work since 2017.
Laser deposition additive manufacturing technology (LMD) principle
Xin Jinghe uses laser deposition additive technology (commonly known as powder laser metal 3D printing technology) to form high-temperature titanium alloy materials, which can realize low-cost and rapid integral forming of large and complex structural components, greatly improving material utilization. It saves mold cost and reduces processing cycle, and can be well adapted to the requirements of fast response and intelligent manufacturing in the high-end equipment field.
The high-power laser is used as the energy source, and the powder to be melted is directly sent into the molten pool generated by the high-energy beam laser by the synchronous feeding method of the powder. The high-energy beam laser guided by the machine tool or the robot is driven by the track layer by layer, and the layers are stacked. Formed three-dimensional metal parts.
Laser deposition additive manufacturing technology advantages
The energy input, spot diameter (melt width), forming mode, scanning path and layer thickness can be precisely controlled to realize the molding and manufacturing of metal parts of any complex shape. It has the advantages of high efficiency, low cost and high quality when manufacturing large complex high performance structures. Therefore, it is of great theoretical and practical value to study the laser melting deposition manufacturing technology of high temperature titanium alloy materials.
Laser deposition additive process for high temperature titanium alloy materials with temperature resistance above 600 °C
Xin Jinghe Technology R&D team started with the matching of materials and processes, and studied the adaptability of laser deposition additive process for series high temperature titanium alloy materials with temperature resistance above 600 °C. At the same time, Xin Jinghe cooperated with the Institute of Metal Research of the Chinese Academy of Sciences and the Third Academy of Aerospace Science and Technology to form a strong combination, and developed high-temperature titanium alloy grades such as Ti60, Ti65 and Ti750 and titanium alloy-based composite materials above 800 °C. Development, process exploration and design application technology research, especially through the six-feed powder head simultaneously spraying a variety of different alloying elements and composite materials, which solves the problems of segregation and refractory of traditional smelting process and difficult grading of multi-gradient temperature. Solve the problem of process limitations in material development.
After hard work, Xin Jinghe broke through the laser deposition manufacturing technology of high temperature titanium alloy materials above 600 °C, and mastered the additive manufacturing process of serialized high temperature titanium alloy materials. They developed a high-temperature titanium alloy material zone forming strategy, a negative lapped Great Wall shape scanning strategy, combined with reasonable control of the lap ratio parameters, and the use of a method of adding active metal powder in the laser deposition additive manufacturing process to eliminate high temperature titanium alloy. The fine defects that may occur during the laser deposition process enable high-performance and high-reliability forming of high-temperature titanium alloys.
The LM-S2510 laser deposition forming equipment of Tianjin Leiming, a subsidiary of Xinjinghe, has produced high-temperature titanium alloy products above 600 °C, which has been installed in an aircraft model field.
The high-temperature titanium alloy member of 3D printing has uniform internal structure, controllable defects, uniform appearance, high strength, high temperature resistance and excellent comprehensive performance. Taking a brand of high-temperature titanium alloy as an example, the performance of metal parts is as follows:
The room temperature tensile strength reaches 1080MPa, the yield strength reaches 980MPa, the elongation rate is more than 10%, and the impact toughness αKU reaches 30J/cm2 or more;
The tensile strength at 600 ° C can reach 700 MPa, the yield strength reaches 560 MPa, and the elongation reaches 20%.
The tensile strength at 650 ° C reaches 640 MPa, the yield strength reaches 500 MPa, and the elongation is close to 30%.
The high temperature at 600 ° C and 450 MPa stress lasts for more than 30 h;
The high temperature at 650 ° C 330MPa stress lasts for more than 15h, and has a high fracture toughness value KIC.
The high-temperature titanium alloy material manufactured by laser deposition additive is expected to be widely used in aerospace, shipbuilding and chemical industries due to its good comprehensive performance, especially the excellent high temperature performance above 600 °C. The application breakthrough of this technology will provide stronger high-performance materials and process technology for high-end equipment manufacturing in China.
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