CN-116380892-B - Method for checking and controlling production quality of Ti60 titanium alloy blisk

Abstract

The invention relates to a method for checking and controlling the production quality of Ti60 titanium alloy blisk, which belongs to the technical field of manufacturing of key materials and parts of aeroengines and comprises the steps of carrying out die forging process treatment, solid solution heat treatment and aging heat treatment on a plurality of batches of blanks, forming blisk forgings of Ti60 titanium alloy, extracting 1 piece of forgings from each batch of blisk forgings, dissecting along the radial direction of each piece of forgings, respectively cutting microstructure samples with different sizes at least at positions of blades, rims, webs and hubs, carrying out pretreatment on each microstructure sample to prepare a surface to be checked, carrying out microstructure test on each surface to be checked by adopting optical microscopes with different multiples, and analyzing whether parameter characteristics of beta grains and alpha grains are qualified or not and meet preset conditions. The invention improves the production quality efficiency of the Ti60 titanium alloy blisk.

Inventors

• CHENG RONGHUI
• ZHANG HANG
• TIAN WEI
• ZHANG SHAOPING
• FU YU
• GUO HUIMING
• ZHONG YAN
• HE JIN
• BAI YUNRUI
• ZHANG XUEBAO

Assignees

• 中国航发四川燃气涡轮研究院

Dates

Publication Date

20260505

Application Date

20230222

Claims (5)

1. 1. A method for verifying and controlling production quality of a Ti60 titanium alloy blisk, the method comprising: carrying out die forging process treatment, solution heat treatment and aging heat treatment on a plurality of batches of blanks, and forming a blisk forging of the Ti60 titanium alloy; Extracting 1 forging piece from each batch of leaf disc forging pieces, and dissecting along the radial and axial directions of the forging pieces; Respectively cutting microstructure samples with different sizes at least at the positions of the blade, the rim, the web plate and the hub; preprocessing each microstructure sample to prepare a surface to be tested; and carrying out microscopic structural test on each inspection surface by adopting optical microscopes with different multiples, and analyzing whether the parameter characteristics of the beta grains and the alpha grains are qualified or not, wherein the requirements are satisfied: a) The microstructure should be a structure formed by processing an alpha+beta two-phase region, namely, a low-aspect ratio primary alpha phase is uniformly distributed on a matrix of a beta transition structure; b) The microstructure has no flat continuous and coarse network grain boundary alpha phase, and the size of the original beta grains is between 0.05 and 0.4 mm; c) The content of primary alpha phase in the microstructure is 5% -35%; d) When the aspect ratio of the primary alpha phase is more than 3, the length of the primary alpha phase is less than 0.5mm; e) When the primary alpha phase is in a block shape, the maximum size is less than 0.25mm; The mechanical property of the prepared Ti60 titanium alloy blisk meets the conditions that the tensile strength sigma b is more than or equal to 950MPa at room temperature, the yield strength sigma 0.2 is more than or equal to 880MPa, the elongation delta 5 is more than or equal to 6%, the area shrinkage psi is more than or equal to 15%, the strength deficiency ratio sigma bＨ /σ b at the room temperature of K t =3 is more than or equal to 1.25, and the room temperature fracture toughness K IC ≥35 MPa•m 1/2 ; The residual strain epsilon p of the prepared Ti60 titanium alloy blisk under the conditions that the test stress sigma is 150MPa and the test time tau is 100h at 600 ℃ is less than or equal to 0.2%, and the thermal stability elongation delta 5 after the blisk is heated for 100h at 600 ℃ is more than or equal to 3%, and the area shrinkage phi is more than or equal to 6%.
2. 2. The method of claim 1, wherein the swaging process comprises: The metal temperature of each part of the blank is controlled within the range of 40-70 ℃ below the phase transition temperature T β , and the forging deformation of different parts of the blank is controlled within the range of 35-75%.
3. 3. The method of claim 1, wherein the solution heat treatment comprises: the temperature of the blank solid solution treatment is 15-30 ℃ below the phase transition temperature Tbeta, the heat preservation time is 2-4 h, and the cooling mode is air cooling.
4. 4. The method of claim 1, wherein microscopic tissue samples of Φ30mm x 20mm or 20mm x 20mm are cut at least at four different locations of the blade, rim, web, and hub, respectively.
5. 5. The method of claim 1, wherein each of said test surfaces is subjected to a microstructural test using an optical microscope at a magnification of 100 and 200.

Description

Method for checking and controlling production quality of Ti60 titanium alloy blisk Technical Field The invention belongs to the technical field of aeroengine key material and part manufacturing, and particularly relates to a method for checking and controlling production quality of a Ti60 titanium alloy blisk. Background The Ti60 titanium alloy is a high-temperature titanium alloy which is independently designed and developed in China and can work at 600 ℃ for a long time. The alloy is a multi-element composite reinforced near alpha-type titanium alloy, and has high heat resistance, specific strength and good fatigue performance at the high temperature of 500-600 ℃. The alloy is suitable for manufacturing key parts such as integral vane disks, casing and the like of the gas compressor. The integral vane disk of the air compressor is a structure adopted for improving the performance and reducing the weight of the advanced aeroengine. The blisk combines the traditional wheel disc and blade separation structure into a whole, so that the number of parts can be greatly reduced, the weight of the structure is reduced, and the pneumatic efficiency and the working reliability of the compressor are improved. The integral vane disk of the air compressor has high work load and complex stress state, and has very strict requirements on the performance of materials. When the Ti60 titanium alloy is adopted to manufacture the blisk, the performance control needs to be considered at different positions such as the blade, the rim and the disk body. The Ti60 titanium alloy is required to have good vibration fatigue resistance and thermal stability at the blade part of the blisk, excellent durable creep resistance at the rim part, and good low cycle fatigue resistance at the disk part. The thermal processing parameters of the Ti60 titanium alloy blisk have important influences on the microstructure and mechanical properties of the blisk, are influenced by a forging process and a heat treatment process, and when the process parameters fluctuate excessively, the abnormal structure of the Ti60 titanium alloy blisk is easily caused, the mechanical properties of the blisk are correspondingly caused to exceed the standard, and the use of the blisk for a loader is risked. Disclosure of Invention In view of the above, the invention provides a method for checking and controlling the production quality of the Ti60 titanium alloy blisk, which can judge the rationality and the parameter stability of the hot working process after the microstructure of the Ti60 titanium alloy blisk is checked, ensure that each mechanical property of the blisk meets the use requirement and improve the production efficiency of the Ti60 titanium alloy blisk. A method for checking and controlling the production quality of a Ti60 titanium alloy blisk is provided, the method comprising: carrying out die forging process treatment, solution heat treatment and aging heat treatment on a plurality of batches of blanks, and forming a blisk forging of the Ti60 titanium alloy; Extracting 1 forging piece from each batch of leaf disc forging pieces, and dissecting along the radial and axial directions of the forging pieces; Respectively cutting microstructure samples with different sizes at least at the positions of the blade, the rim, the web plate and the hub; preprocessing each microstructure sample to prepare a surface to be tested; and carrying out microscopic structural test on each inspection surface by adopting optical microscopes with different multiples, and analyzing whether the parameter characteristics of the beta grains and the alpha grains are qualified or not, wherein the requirements are satisfied: a) The microstructure should be a structure formed by processing an alpha+beta two-phase region, namely, a low-aspect ratio primary alpha phase is uniformly distributed on a matrix of a beta transition structure; b) The microstructure has no flat continuous and coarse network grain boundary alpha phase, and the size of the original beta grains is between 0.05 and 0.4 mm; c) The content of primary alpha phase in the microstructure is 5% -35%; d) When the aspect ratio of the primary alpha phase is more than 3, the length of the primary alpha phase is less than 0.5mm; e) When the primary alpha phase is in the form of a block, its largest dimension is less than 0.25mm. The invention has the beneficial effects that: 1) The content, morphology and size of primary alpha phase in the microstructure of the Ti60 titanium alloy blisk are mainly influenced by the forging process and the heat treatment process. The microstructure inspection result provided by the invention can well reflect the rationality of the Ti60 titanium alloy blisk forging and heat treatment process and the accuracy of parameter control. 2) The content, morphology and size of the primary alpha phase in the microstructure of the Ti60 titanium alloy blisk can influence the mechanical properties of the b