A hot isostatic pressing process of ti2alnb alloy powder
A technology of hot isostatic pressing and alloy powder, which is applied in the field of powder metallurgy titanium alloy, which can solve the problems of low durability of powder alloy, poor performance of performance test rods, and uneven density, so as to improve density and reduce manufacturing costs , Improve the effect of comprehensive mechanical properties
Active Publication Date: 2021-06-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
[0004] However, the powdered Ti prepared by powder metallurgy process 2 AlNb alloy also has its own disadvantages, such as uneven density when preparing large-scale and complex components, the durability of powder alloys is lower than that of forged alloys, and there is a difference between the performance of large-scale and complex components and the performance of test rods
For powdered Ti 2 For the high-temperature and durable life of AlNb alloys, researchers at home and abroad have developed a series of methods, which mainly include: after the hot isostatic pressing of the powder, the powder billet is large-scaled by extrusion, isothermal forging, and ring rolling. Deformation of the amount of deformation to improve the phase distribution and homogeneity of powder alloys; undoubtedly, these methods limit the application areas of the material
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Embodiment 1
[0047] The difference from Comparative Example 2 is that a low-temperature holding stage is added before the hot isostatic pressing treatment.
[0048] Example 1 The powder of the alloy was prepared by argon atomization, and the powder with a size below 250 microns was put into a carbon steel ladle, and after vacuum degassing, it was first subjected to low-temperature pressure-holding treatment, and then hot isostatic pressing. The following process system (C) was selected for this alloy, and the process system (C) curve is shown in figure 1 Shown in (b), concrete technological condition is as follows:
[0049] The first stage of low temperature and pressure holding process: temperature and pressure increase with the furnace, 1010°C / 140MPa / 1 hour, after completion, cool with the furnace;
[0050] The second stage of hot isostatic pressing process: 1030 ° C / 140 MPa / 3 hours, cooled to room temperature with the furnace.
[0051] The holding temperature of the first stage of...
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Abstract
The invention discloses a Ti 2 The invention relates to a hot isostatic pressing process of AlNb alloy powder, which belongs to the field of powder metallurgy titanium alloy. The process will first be loaded with Ti 2 The package of AlNb powder is put into the hot isostatic pressing equipment for the first stage of low-temperature pressure-holding treatment to make the material densified; then continue heating to make the package heat up to the hot isostatic pressing temperature T2 with the furnace and keep it warm for a period of time , so that the material structure is uniform; stop heating, cool to room temperature with the furnace, and obtain Ti 2 AlNb alloy components. The present invention can improve powder Ti 2 The density of various parts of AlNb alloy complex components, thereby improving the powder Ti 2 Durable lifetime of AlNb alloys.
Description
technical field [0001] The invention relates to the technical field of powder metallurgy titanium alloys, in particular to a Ti 2 Hot isostatic pressing process of AlNb alloy powder. Background technique [0002] Ti 2 AlNb alloy is a Ti-Al intermetallic compound alloy with orthorhombic structure O phase as the main composition phase. It has excellent strength, fracture toughness and creep resistance at 650-750 ° C, and has low density and good Antioxidant capacity, so Ti 2 AlNb alloys have a strong application potential in the hot end parts of aero-engines. Ti 2 At present, the complex components of AlNb alloy mainly adopt the forming process of precision casting or split forging + welding. Precision casting has casting defects such as shrinkage cavity, porosity, and composition segregation that are difficult to completely solve, resulting in high scrap rate and common use of out-of-tolerance; forging combined with welding The method has low material utilization rate an...
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IPC IPC(8): C22C1/04C22C30/00B22F3/15
CPCC22C1/0458C22C30/00C22C14/00B22F3/15C22C1/047
Inventor 吴杰徐磊郭瑞鹏杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI