Titanium alloy profile performance evaluation test method

Abstract

The invention belongs to the technical field of titanium alloy performance evaluation, and discloses a titanium alloy profile performance evaluation test method, which comprises the following steps: selecting a sample form according to the profile wall thickness, selecting a plate-type sample when the profile wall thickness is 0.5-5.0 mm, selecting a rod-shaped sample when the profile wall thickness is greater than 5.0 mm, and selecting a plate-type sample when the profile wall thickness is greater than 5.0 mm; at the moment, the sampling position of the longitudinal sample is located at the position 1 / 3 away from the edge of the vertical edge or the bottom edge of the selected or specified profile according to the center line of the test bar. The length of the working section of the plate-type tensile sample and the cross-sectional area of the working section should meet conditions, the size of the working section of the rod-shaped tensile sample can be a standard sample or a non-standard sample, and the diameter of the rod-shaped compression sample can be 13 mm or 15 mm. According to the method, a performance evaluation sample sampling scheme is determined according to the wall thickness size, the section shape and the like of the profile, and the performance levels of different sides, different directions and different parts of titanium alloy profiles with different marks and different section specifications can be comprehensively, objectively and accurately evaluated by adopting a plate-shaped or rod-shaped sample according to the characteristics of thin-wall or thick-plate profiles; and performance evaluation result deviation caused by different sampling schemes is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium alloy performance evaluation, and particularly relates to a titanium alloy profile performance evaluation test method. Background Art

[0002] Titanium alloy profiles are widely used in the aviation field at home and abroad. Titanium alloy profiles can be divided into thin-walled profiles (wall thickness δ≤5mm) and thick-walled profiles (wall thickness δ>5mm) according to the wall thickness. Therefore, when evaluating and testing the specimens, it is necessary to decide whether to sample the reference plate or the reference forging based on the wall thickness. When sampling in the length direction of the profile, it may be impossible to process tensile, compression, fatigue, fracture toughness, fatigue crack propagation and other performance specimens according to the usual standard specimen size requirements due to the small size of the profile in the width direction of one side. Some specifications of profiles cannot even be processed with the usual non-standard specimens. Therefore, due to the width limitation, the lateral performance is difficult to evaluate and assess. In addition, there are certain differences in the microstructure and properties of the head, middle and tail of the extruded titanium alloy profile, as well as the microstructure and properties of different sides or different positions on the same side.

[0003] Therefore, in order to comprehensively, objectively and accurately evaluate the performance levels of titanium alloy profiles of different grades and cross-sectional specifications, it is urgently necessary to further clarify and specify the sampling form, sampling direction, sampling quantity and sample specifications of titanium alloy profiles to meet the evaluation requirements of the performance of profiles in different directions and different parts, thereby promoting the improvement and improvement of the quality and process level of titanium alloy profiles. Summary of the Invention

[0004] The purpose of the present invention is to propose a performance evaluation and testing method for titanium alloy profiles to solve the problem that there is currently no unified and clear evaluation and testing method for titanium alloy profiles at home and abroad, such as sampling form, sampling position, sample specifications and dimensions, and thus it is impossible to comprehensively, objectively and accurately evaluate the performance levels of titanium alloy profiles of different grades and different cross-sectional specifications.

[0005] To solve this technical problem, the technical solution of the present invention is:

[0006] A titanium alloy profile performance evaluation test method, the method comprising the following steps:

[0007] Step 1: Select the performance evaluation specimen as a plate specimen or a rod specimen according to the thickness of each side of the profile; when the profile wall thickness δ ≥ 0.5mm and the wall thickness δ ≤ 5.0mm, select the plate specimen; when the wall thickness δ > 5.0mm, select the rod specimen;

[0008] Step 2: Determine the sampling direction and number of samples according to the sample form selected in step 1, the cross-sectional shape and specifications of the profile, and the width of each side;

[0009] In step 2, when sampling the profile longitudinally, cut 3 or 5 specimens in sequence along its length. When sampling the profile transversely or vertically, cut 3 or 5 specimens side by side along its length.

[0010] Step 3: Determine the sample sampling position according to the sample form selected in step 1 and the sampling direction determined in step 2;

[0011] Step 4: Design the sample size based on the sample form, sampling direction, and sampling location determined in steps 1 to 3. The specific options are as follows:

[0012] The working section length L0 and the cross-sectional area F0 of the plate tensile specimen should satisfy L0 / F0. 1 / 2 =5.65;

[0013] The diameter of the working section of the rod tensile specimen can be designed according to the wall thickness of the profile into a standard specimen with a working section of φ6mm×24mm or Φ5mm×25mm;

[0014] The working section diameter of the rod-shaped tensile specimen can be designed into non-standard specimens with a working section of Φ2.5mm×10mm or Φ3mm×15mm according to the wall thickness of the profile;

[0015] The diameter of the rod compression specimen can be designed to be Φ13mm or Φ15mm according to the wall thickness of the profile.

[0016] Whether it is a plate tensile specimen, a rod tensile specimen, or a rod compression specimen, it is preferably designed as a standard specimen. If the wall thickness of the profile can be designed as a standard specimen, it is designed as a standard specimen. If the thickness is not enough for a standard specimen, it is designed as a non-standard specimen.

[0017] In step 1, the straightness of the plate specimen profile should meet the following requirements: the torsion angle around the longitudinal axis in any 1000mm length should not be greater than 2°; the gap between a horizontal ruler placed on any plane and the profile surface should not exceed 1% of the edge plate width; the longitudinal curvature of any surface of the profile (including the web) in any 1000mm length should not be greater than 2mm; the profile surface roughness Rz value should not be greater than 20μm. The appearance quality of the profile should meet the following requirements: the surface is not allowed to have defects such as cracks, delamination, metallic and non-metallic inclusions, pores, shrinkage, etc.; oxygen-rich layers or other surface contamination layers are not allowed; the profile surface needs to be mechanically polished, and the surface roughness Rz value should not be greater than 20μm; during specimen processing, the upper and lower surfaces of the specimen should be in the incoming state, and grinding, sandblasting or alkaline pickling treatment is not allowed during the processing.

[0018] The straightness of the rod-shaped specimen in step 1 must meet the following requirements: the torsion angle around the longitudinal axis within any 300mm length should not exceed 1°, the transverse curvature within any 25mm width should not exceed 0.25mm, and the longitudinal curvature within any 300mm length should not exceed 0.65mm. The surface roughness Rz value of the profile should not exceed 80μm. The profile appearance quality must meet the following requirements: the surface must not have defects such as cracks, delamination, metallic and non-metallic inclusions, pores, shrinkage, etc., and no oxygen-rich layers or other surface contamination layers are allowed.

[0019] In step 2, when the width or height of one side of the profile is ≥50mm, the specimen should be cut in the horizontal or vertical direction.

[0020] When selecting a rod-shaped specimen, the longitudinal specimen sampling location in step 3 should be based on the cross-sectional specifications and dimensional characteristics of the profile, with the centerline of the test rod located 1 / 3 of the distance from the edge of the selected or designated vertical or bottom edge of the profile. We conducted multiple performance tests and comparisons, and the performance results obtained from sampling at the 1 / 3 position indicate the lowest cross-sectional performance of the selected or designated vertical or bottom edge of the profile, providing a more accurate assessment of the profile's performance.

[0021] In step 4, the length and width of the clamping end of the plate tensile specimen are determined according to the side length and width in the sampling direction of the profile to ensure that the specimen breaks within the effective range during the tensile test.

[0022] In step 4, the clamping end of the rod-shaped tensile specimen can be designed as a smooth rod style or a threaded style to ensure that the specimen breaks within the effective range during the tensile test.

[0023] In step 4, the plate specimens involving shear, support, bending, thermal stability, fatigue, etc. are designed with corresponding working section and clamping end dimensions according to the wall thickness of the profile and reference to the plate test standards and atlas. The rod specimens are selected directly according to the profile dimensions and reference to the test standards and atlas.

[0024] The profile performance evaluation test method is applicable to titanium alloy profiles with a wall thickness of ≥0.5 mm, and is applicable to cross-sections of right-angle "L", acute-angle "L", "T", "U", "Y", "Z", and "I" shapes; it is particularly applicable to medium, low, and high strength titanium alloys such as TC1, TC2, TC4, TA15, TA21, and TC18.

[0025] The beneficial effects of the present invention are:

[0026] This invention mainly targets titanium alloy thick-walled and thin-walled profiles widely used in aircraft. The performance evaluation sample sampling scheme is determined based on the profile wall thickness and cross-sectional shape. Plate or rod-shaped samples are used to accurately evaluate the performance level of each side of the profile in different directions according to the characteristics of thin-walled or thick-plate profiles. When the profile wall thickness is 0.5mm to 5.0mm, plate-shaped samples are selected. When the wall thickness is greater than 5.0mm, rod-shaped samples are selected. At this time, the longitudinal sample sampling position is that the center line of the test rod is located at 1 / 3 of the side. The working section length L0 of the plate tensile test specimen and the working section cross-sectional area F0 should meet L0 / F0. 1 / 2 =5.65, the working section size of the rod-shaped tensile specimen can be standard specimens of Φ6mm×24mm and Φ5mm×25mm, or non-standard specimens with working sections of Φ2.5mm×10mm and Φ3mm×15mm, and the diameter of the rod-shaped compression specimen can be Φ13mm or Φ15mm.

[0027] The invention has been used to complete the testing and evaluation of the key properties and comprehensive performance of multiple batches of domestic and imported TC2, TC4 and TA15 titanium alloy thick-walled and thin-walled profiles. The cross-sectional specifications involved include U-type, equilateral L-type, acute-angle L-type, T-type, Z-type and Y-type. The evaluation results comprehensively, objectively and accurately reflect the performance level of domestic and foreign profiles, and provide a large amount of performance data support for subsequent profile machining, cold drawing and bending, hot sag forming, welding and heat treatment, which is conducive to promoting the improvement and improvement of the quality and process level of domestic profiles. In addition, the method of the present invention is simple and convenient, the evaluation scheme is unified and clear, the design process is controllable, and the deviation of performance results caused by different sampling schemes can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the technical solutions implemented in the present invention, the following briefly explains the drawings required for use in the examples of the present invention. It is obvious that the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0029] Figure 1 Schematic diagram of three typical specifications of thick-walled profiles and longitudinal sampling positions of rod-shaped specimens of the present invention;

[0030] Figure 2 Schematic diagrams of four typical specifications of the thin-walled profiles of the present invention;

[0031] Figure 3 This is a diagram of a rod-shaped tensile performance test specimen of the profile of the present invention;

[0032] Figure 4 This is a diagram of a rod-shaped compression performance test specimen of the present invention;

[0033] Figure 5 This is a sample diagram of the profile plate type room temperature tensile performance test of the present invention;

[0034] Figure 6 This is a diagram of a profile plate high-temperature tensile performance test specimen of the present invention;

[0035] Figure 7 This is a schematic diagram of the longitudinal sampling position of the T-profile;

[0036] Figure 8 This is a schematic diagram of the longitudinal sampling position of the U-profile;

[0037] Figure 9 This is a schematic diagram of the longitudinal sampling position of the L-profile;

[0038] Figure 10 Schematic diagram of the longitudinal sampling position of thin-walled L-profile;

[0039] Figure 11 Schematic diagram of the longitudinal sampling position of thin-walled T-profile;

[0040] Figure 12 Schematic diagram of the longitudinal sampling position of thin-walled Z profiles. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] The features of various aspects of the embodiments of the present invention will be described in detail below. In the detailed description below, many specific details are provided to provide a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be implemented without these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is not limited to any specific configuration and method provided below, but rather encompasses all product structures, methods, and any improvements, replacements, etc., covered without departing from the spirit of the present invention.

[0043] In the various drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.

[0044] Example 1:

[0045] The following is an example of a thick-walled T-profile made of TC4 titanium alloy, in which the vertical side wall thickness δ1 is 11 mm, the height B is 48 mm, the bottom side wall thickness δ2 is 16 mm, and the width W is 68 mm.

[0046] The performance evaluation specimen is selected as a rod specimen according to the thickness of the vertical edge and bottom edge of the T-profile, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical edge according to the attached Figure 3 (d) Processing (working section is Φ2.5mm×10mm), longitudinally stretch the specimen according to the bottom wall thickness according to the attached Figure 3 (a) Processing (working section is Φ6mm×24mm), according to the bottom wall thickness and width, the transverse tensile test specimen is stretched in accordance with Figure 3 (d) Processing (working section is Φ2.5mm×10mm); longitudinally compress the specimen according to the bottom wall thickness according to the attached Figure 4 (a) Processing (Φ13mm), according to the bottom wall thickness and width of the transverse compression specimen according to the attached Figure 4 (a) Processing (Φ13mm).

[0047] According to the size of the vertical edge and bottom edge of the T-profile, six locations were selected for longitudinal tensile specimen sampling (see Figure 7 The positions 1 to 6 are shown in the figure, which are the bottom edge, 1 / 3 of the bottom edge, the center of the bottom edge, the center of the vertical edge, 1 / 3 of the vertical edge, and the edge of the vertical edge; three positions were selected for longitudinal compression test samples (see Figure 7 (As shown in the figure, positions 1 to 3 are at the bottom edge, 1 / 3 of the bottom edge, and the center of the bottom edge, respectively. For transverse tensile and transverse compression specimens, any position on the bottom edge can be selected. For longitudinal sampling, three specimens are cut longitudinally at each position along their length. For transverse sampling, three specimens are cut side by side along their length.

[0048] The tensile and compressive properties of the T-profile are shown in Tables 1 and 2. The sample specifications selected in Example 1 and the 1 / 3 position of the bottom edge or the 1 / 3 position of the vertical edge specified in the invention can truly reflect the actual performance level of the profile.

[0049] Table 1 Tensile properties of T profiles

[0050]

[0051]

[0052] Table 2 Compression properties of T profiles

[0053]

[0054] Example 2:

[0055] The following is an example of a thick-walled T-profile made of TC4 titanium alloy, in which the vertical side wall thickness δ1 is 11 mm, the height B is 48 mm, the bottom side wall thickness δ2 is 16 mm, and the width W is 68 mm.

[0056] The performance evaluation specimen is selected as a rod specimen according to the thickness of the vertical edge and bottom edge of the T-profile, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical edge according to the attached Figure 3 (c) Processing (working section is Φ3mm×15mm), longitudinally stretch the specimen according to the bottom wall thickness according to the attached Figure 3 (b) Processing (working section is Φ5mm×25mm), according to the bottom wall thickness and width, the transverse tensile test specimen is stretched in accordance with Figure 3 (c) Processing (working section is Φ3mm×15mm); longitudinally compress the specimen according to the bottom wall thickness according to the attached Figure 4 (a) Processing (Φ13mm), according to the bottom wall thickness and width of the transverse compression specimen according to the attached Figure 4 (a) Processing (Φ13mm).

[0057] According to the size of the vertical side and bottom side of the T-profile, two locations were selected for longitudinal tensile specimen sampling (see Figure 7 ), which are the 1 / 3 position of the bottom edge and the 1 / 3 position of the vertical edge respectively; a position was selected for longitudinal compression specimen sampling (see Figure 1 ), which is the 1 / 3 position of the bottom edge; for transverse tensile and transverse compression specimens, select any position on the bottom edge. When sampling longitudinally, cut three pieces longitudinally at each position along its length; when sampling transversely, cut three pieces side by side along its length.

[0058] The tensile and compressive properties of the T-profile are shown in Tables 3 and 4. The sample specifications selected in Example 2 and the 1 / 3 position of the bottom edge or the 1 / 3 position of the vertical edge specified in the invention can truly reflect the actual performance level of the profile.

[0059] Table 3 Tensile properties of T profiles

[0060]

[0061] Table 4 Compression properties of T profiles

[0062]

[0063] Example 3:

[0064] The following is an example of a TC4 titanium alloy thick-walled U-profile, in which the vertical side wall thickness δ1 of the U-profile is 10 mm, the height B is 46.5 mm, the bottom side wall thickness δ2 is 16.5 mm, and the width is 75 mm.

[0065] The performance evaluation specimen is selected as a rod specimen according to the thickness of the vertical side and bottom side of the U-shaped material, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical side according to the attached Figure 3 (d) Processing (working section is Φ2.5mm×10mm), longitudinally stretch the specimen according to the bottom wall thickness according to the attached Figure 3 (a) Processing (working section is Φ6mm×24mm), according to the bottom wall thickness and width, the transverse tensile test specimen is stretched in accordance with Figure 3 (a) Processing (working section is Φ6mm×24mm); longitudinally compress the specimen according to the bottom wall thickness according to the attached Figure 4 (b) Processing (Φ15mm), according to the bottom wall thickness and width of the transverse compression specimen according to the attached Figure 4 (b) Processing (Φ15mm).

[0066] According to the size of the vertical side and bottom side of the U-profile, two locations were selected for longitudinal tensile testing (see Figure 8 (As shown in the figure, positions 1 and 2 are located at 1 / 3 of the bottom edge and 1 / 3 of the vertical edge, respectively. For longitudinal compression specimens, a single location was selected, which was 1 / 3 of the bottom edge. For transverse tension and transverse compression specimens, any location on the bottom edge was selected. For longitudinal sampling, three pieces were cut longitudinally from each location along their length. For transverse sampling, three pieces were cut side by side along their length.

[0067] The tensile and compressive properties of the U-profile are shown in Tables 5 and 6. The sample specifications selected in Example 3 and the 1 / 3 position of the bottom edge or the 1 / 3 position of the vertical edge specified in the invention can truly reflect the actual performance level of the profile.

[0068] Table 5 U profile tensile properties

[0069]

[0070] Table 6 Compression performance of U profile

[0071]

[0072] Example 4:

[0073] The following is an example of a thick-walled L-profile made of TC4 titanium alloy. The vertical side wall thickness δ1 of the L-profile is 16 mm, the height B is 68 mm, the bottom side wall thickness δ2 is 11 mm, and the width is 52 mm.

[0074] According to the thickness of the vertical side and bottom side of the L-shaped material, the performance evaluation specimen is selected as a rod specimen, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical side wall according to the attached Figure 3 (a) (working section is Φ6mm×24mm) and attached Figure 3 (b) (working section is Φ5mm×25mm) and the longitudinal tensile test specimens are processed according to the attached Figure 3 (c) (working section is Φ3mm×15mm) and attached Figure 3(d) (working section is Φ2.5mm×10mm) and the transverse tensile test specimens are processed according to the bottom wall thickness and width according to the attached Figure 3 (c) (working section is Φ3mm×15mm) and attached Figure 3 (d) (working section is Φ2.5mm×10mm) and the vertical tensile test specimens are processed according to the attached Figure 3 (c) (working section is Φ3mm×15mm) and attached Figure 3 (d) (working section is Φ2.5mm×10mm) processing; according to the vertical wall thickness, the longitudinal compression specimens are respectively processed according to the attached Figure 4 (a) (Φ13mm) and attached Figure 4 (b) (Φ15mm) processing, according to the vertical edge height and wall thickness, the high compression specimens are respectively Figure 4 (a) (Φ13mm) and attached Figure 4 (b) (Φ15mm) processing.

[0075] According to the size of the vertical side and bottom side of the L-profile, two locations were selected for longitudinal tensile testing (see Figure 9 (as shown), respectively, at the 1 / 3 position on the bottom edge and the 1 / 3 position on the vertical edge; for longitudinal compression specimens, a single location was selected, the 1 / 3 position on the vertical edge; for high-axis tension and high-axis compression specimens, sampling was performed at any location on the vertical edge; for transverse tension specimens, sampling was performed at any location on the bottom edge. For longitudinal sampling, three pieces were cut longitudinally from each location along its length; for transverse sampling, three pieces were cut side by side along its length; for high-axis sampling, three pieces were cut side by side along its length.

[0076] The tensile and compressive properties of the L-profile are shown in Tables 7 and 8. The sample specifications selected in Example 4 and the 1 / 3 position of the bottom edge or the 1 / 3 position of the vertical edge specified in the invention can truly reflect the actual performance level of the profile.

[0077] Table 7L profile tensile properties

[0078]

[0079] Table 8L profile compression performance

[0080]

[0081] Example 5:

[0082] The following is an example of a TC2 titanium alloy thin-walled equilateral L-profile, in which the bottom wall thickness δ1 of the equilateral L-profile is 1.6 mm, the width A is 31 mm, the vertical wall thickness δ2 is 1.6 mm, and the height A is 31 mm.

[0083] The performance evaluation specimen is selected as a plate specimen according to the thickness of the vertical and bottom sides of the equal-sided L-shaped material, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical and bottom sides according to the attached Figure 5 (c) Processing. When sampling longitudinally, cut 3 pieces longitudinally along their length. The sampling positions are shown in the table below. Figure 10 shown.

[0084] The tensile properties of TC2 titanium alloy thin-walled equilateral L-profiles are shown in Table 9. The sample specifications selected in Example 5 can truly reflect the actual performance level of the profile.

[0085] Table 9 Tensile properties of TC2 titanium alloy thin-walled equilateral L-profiles

[0086]

[0087] Example 6:

[0088] The following is an example of a thin-walled T-profile made of TC2 titanium alloy, in which the vertical side wall thickness δ1 is 1.7 mm, the height B is 63 mm, the bottom side wall thickness δ2 is 2.1 mm, and the width A is 63 mm.

[0089] The performance evaluation specimen is selected as a plate specimen according to the thickness of the vertical edge and bottom edge of the T-profile, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical edge according to the attached Figure 5 (c) Processing: longitudinally stretch the specimen according to the bottom wall thickness according to the attached Figure 5 (g) Processing. When sampling longitudinally, cut 3 pieces longitudinally along their length. The sampling positions are shown in the table below. Figure 11 shown.

[0090] The tensile properties of TC2 titanium alloy thin-walled T-profiles are shown in Table 10. The sample specifications selected in Example 6 can truly reflect the actual performance level of the profiles.

[0091] Table 10 Tensile properties of TC2 titanium alloy thin-walled T-profiles

[0092]

[0093] Example 7:

[0094] The following is an example of a TA15 titanium alloy thin-walled equilateral L-profile, in which the bottom wall thickness δ1 of the equilateral L-profile is 2.1 mm, the width A is 27 mm, the vertical wall thickness δ2 is 1.6 mm, and the height A is 27 mm.

[0095] The performance evaluation specimen is selected as a plate specimen according to the thickness of the vertical side and bottom side of the equal-side L-shaped material, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical side according to the attached Figure 5 (b) Processing: longitudinally stretch the specimen according to the bottom wall thickness according to the attached Figure 5(e) Processing. When sampling longitudinally, cut 3 pieces longitudinally along their length. The sampling positions are shown in the table below. Figure 10 shown.

[0096] The tensile properties of TA15 titanium alloy thin-walled equilateral L-profiles are shown in Table 11. The sample specifications selected in Example 7 can truly reflect the actual performance level of the profile.

[0097] Table 11 Tensile properties of TA15 titanium alloy thin-walled equilateral L-profiles

[0098]

[0099] Example 8:

[0100] The following is an example of a TA15 alloy thin-walled T-profile, where the vertical side wall thickness δ1 is 2.2 mm, the height B is 42 mm, the bottom side wall thickness δ2 is 3.7 mm, and the width A is 58 mm.

[0101] The performance evaluation specimen is selected as a plate specimen according to the thickness of the vertical edge and bottom edge of the T-profile, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical edge according to the attached Figure 5 (f) Processing: longitudinally stretch the specimen according to the bottom wall thickness according to the attached Figure 5 (h) Processing. When sampling longitudinally, cut 3 pieces longitudinally along their length. The sampling positions are shown in the table below. Figure 11 shown.

[0102] The tensile properties of TA15 titanium alloy thin-walled T-profiles are shown in Table 12. The sample specifications selected in Example 8 can truly reflect the actual performance level of the profiles.

[0103] Table 12 Tensile properties of TA15 titanium alloy thin-walled T-profiles

[0104]

[0105] Example 9:

[0106] The following is an example of a TA15 titanium alloy thin-walled acute-angle L-profile, where the bottom edge wall thickness δ1 is 2.0 mm, the width A is 42 mm, the vertical edge wall thickness δ2 is 2.5 mm, and the height B is 38 mm.

[0107] The performance evaluation specimen is selected as a plate specimen according to the thickness of the vertical edge and bottom edge of the acute angle L-shaped profile, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical edge according to the attached Figure 5 (g) Processing: longitudinally stretch the specimen according to the bottom wall thickness according to the attached Figure 5 (g) Processing. When sampling longitudinally, cut 3 pieces longitudinally along their length. The sampling positions are shown in the table below. Figure 10 shown.

[0108] The tensile properties of TA15 titanium alloy thin-walled sharp-edged L-profiles are shown in Table 13. The sample specifications selected in Example 9 can truly reflect the actual performance level of the profile.

[0109] Table 13 Tensile properties of TA15 titanium alloy thin-walled sharp-angle L-profiles

[0110]

[0111] Example 10:

[0112] The following takes TA15 alloy thin-walled Z profile as an example, where the vertical side wall thickness δ of the Z profile is 2.0 mm, the height H is 27.6 mm, the bottom side wall thickness δ1 is 2.0 mm, the width A is 24.5 mm, the top side wall thickness δ2 is 2.0 mm, and the width B is 27 mm.

[0113] The performance evaluation specimen is selected as a plate specimen according to the thickness of the vertical edge and bottom edge of the Z profile, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical edge according to the attached Figure 5 (e) Processing: longitudinally stretch the specimen according to the bottom wall thickness according to the attached Figure 5 (a) Processing, longitudinal tensile test specimen according to the top wall thickness according to the attached Figure 5 (e) Processing. When sampling longitudinally, cut 3 pieces longitudinally along their length. The sampling positions are shown in the table below. Figure 12 shown.

[0114] The tensile properties of TA15 titanium alloy thin-walled Z-profiles are shown in Table 14. The sample specifications selected in Example 10 can truly reflect the actual performance level of the profiles.

[0115] Table 14 Tensile properties of TA15 titanium alloy thin-walled Z profiles

[0116]

[0117] Example 11:

[0118] The following is an example of a TC2 titanium alloy thin-walled acute-angle L-profile, in which the bottom edge wall thickness δ1 is 1.8 mm, the width A is 36 mm, the vertical edge wall thickness δ2 is 1.8 mm, and the height B is 36 mm.

[0119] The performance evaluation specimen is selected as a plate specimen according to the thickness of the vertical edge and bottom edge of the acute angle L-shaped profile, wherein the longitudinal tensile specimen is selected according to the thickness of the vertical edge and bottom edge according to the attached Figure 5 (d) Processing. When sampling longitudinally, cut 3 pieces longitudinally along their length. The sampling positions are shown in the table below. Figure 10 shown.

[0120] The tensile properties of TC2 titanium alloy thin-walled sharp-edged L-profiles are shown in Table 15. The sample specifications selected in Example 11 can truly reflect the actual performance level of the profile.

[0121] Table 15TC2 titanium alloy thin-walled sharp-angle L-profile tensile properties

[0122]

[0123] Example 12:

[0124] The following is an example of a TA15 titanium alloy thin-walled acute-angle L-profile, where the bottom edge wall thickness δ1 is 2.0 mm, the width A is 30 mm, the vertical edge wall thickness δ2 is 2.0 mm, and the height B is 30 mm.

[0125] The performance evaluation specimen is selected as a plate specimen according to the thickness of the vertical edge and bottom edge of the acute angle L-shaped profile, wherein the longitudinal high temperature tensile specimen is selected according to the thickness of the vertical edge and bottom edge according to the attached Figure 6 When sampling longitudinally, cut 15 pieces longitudinally along their length direction. The sampling positions are shown in the table below. Figure 10 As shown, it is used to test the tensile properties at 100°C, 200°C, and 300°C. In order to fully demonstrate the tensile properties of the profile at different temperatures, the vertical edge and the bottom edge are not distinguished during sampling and testing.

[0126] The high-temperature tensile properties of TA15 titanium alloy thin-walled sharp-edged L-profiles are shown in Table 16. The sample specifications selected in Example 12 can truly reflect the actual performance level of the profile.

[0127] Table 16 Tensile properties of TA15 titanium alloy thin-walled sharp-angle L-profiles

[0128]

[0129]

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should all be covered by the scope of protection of the present invention.

Claims

1. A titanium alloy profile performance evaluation test method, characterized in that: The method comprises the following steps: Step 1: Select the performance evaluation specimen as a plate specimen or a rod specimen according to the thickness of each side of the profile; when the profile wall thickness δ is 0.5mm≤wall thickness δ≤5.0mm, select a plate specimen; when the wall thickness δ is greater than 5.0mm, select a rod specimen; Step 2: Determine the sampling direction and number of samples according to the sample form selected in step 1, the cross-sectional shape and specifications of the profile, and the width of each side; In step 2, when sampling the profile longitudinally, cut 3 or 5 specimens in sequence along its length. When sampling the profile transversely or vertically, cut 3 or 5 specimens side by side along its length. Step 3: Determine the sample sampling position according to the sample form selected in step 1 and the sampling direction determined in step 2; Step 4: Design the sample size based on the sample form, sampling direction, and sampling location determined in steps 1 to 3. The specific options are as follows: The working section length L0 and the cross-sectional area F0 of the plate tensile specimen should satisfy L0 / F0. 1 / 2 =5.65; The working section diameter of the rod tensile specimen can be designed to be a standard specimen with a working section of Φ6mm×24mm or Φ5mm×25mm according to the wall thickness of the profile; The working section diameter of the rod-shaped tensile specimen can be designed into non-standard specimens with a working section of Φ2.5mm×10mm or Φ3mm×15mm according to the wall thickness of the profile; The diameter of the rod compression specimen can be designed to be Φ13mm or Φ15mm according to the wall thickness of the profile.

2. The method according to claim 1, wherein: The straightness of the plate specimen profile in step 1 should meet the following requirements: the torsion angle around the longitudinal axis in any section of 1000mm length should not be greater than 2°, the gap between a ruler placed horizontally on any plane and the profile surface should not exceed 1% of the edge plate width, and the longitudinal curvature in any section of 1000mm length on any surface of the profile should not be greater than 2mm.

3. The method according to claim 1, wherein: For the rod-shaped specimen in step 1, the straightness of the profile shall meet the following requirements: the torsion angle around the longitudinal axis in any 300mm length shall not be greater than 1°, the transverse curvature in any 25mm width range shall not be greater than 0.25mm, and the longitudinal curvature in any 300mm length shall not be greater than 0.65mm.

4. The method according to claim 1, wherein: In step 2, when the width or height of one side of the profile is ≥50mm, the specimen should be cut in the horizontal or vertical direction.

5. The method according to claim 1, wherein: When a rod-shaped specimen is selected, the sampling position of the longitudinal specimen in step 3 shall be based on the cross-sectional specifications and dimensional characteristics of the profile, with the center line of the test rod located at 1 / 3 of the distance from the edge of the selected or specified vertical side or bottom side of the profile.

6. The method according to claim 1, wherein: In step 4, the length and width of the clamping end of the plate tensile specimen are determined according to the side length and width in the sampling direction of the profile to ensure that the specimen breaks within the effective range during the tensile test.

7. The method according to claim 1, wherein: In step 4, the clamping end of the rod-shaped tensile specimen can be designed as a smooth rod style or a threaded style to ensure that the specimen breaks within the effective range during the tensile test.

8. The method according to claim 1, wherein: In step 4, the plate specimens involving shear, support, bending, thermal stability, fatigue, etc. are designed with corresponding working section and clamping end dimensions according to the wall thickness of the profile and reference to the plate test standards and atlas. The rod specimens are selected directly according to the profile dimensions and reference to the test standards and atlas.

9. The method according to claim 2, wherein: The surface roughness Rz value of the plate specimen profile in step 1 should not be greater than 20 μm.

10. The method according to claim 3, wherein: The surface roughness Rz value of the rod-shaped specimen profile in step 1 should not be greater than 80 μm.

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