Titanium alloy blade of gas compressor and preparation method of titanium alloy blade

Abstract

The invention discloses a titanium alloy blade of a gas compressor and a preparation method of the titanium alloy blade. The titanium alloy blade of the gas compressor comprises, by mass, 6.1%-6.3% of aluminum, 1.8%-1.9% of molybdenum, 2.4%-2.45% of chromium, 0.5%-0.6% of iron, smaller than or equal to 0.07% of oxygen and the balance titanium. The prepared titanium alloy blade is uniform and stable in component, structure and performance, reasonable in grain orientation distribution, good in strength and plasticity matching performance and excellent in fatigue performance.

Description

Technical Field

[0001] The invention belongs to the technical field of nonferrous metal materials, and in particular relates to a compressor titanium alloy blade, and also relates to a preparation method of the compressor titanium alloy blade. Background Art

[0002] Titanium alloy blades are subjected to high temperature, high pressure, alternating stress, gas erosion and other complex factors in the service environment of aircraft engine compressors for a long time, which puts extremely high demands on the composition, process, organization and other performance of titanium alloy blade materials. Therefore, improving the performance of titanium alloy blades is the primary issue to be solved. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a compressor titanium alloy blade. The present invention also provides a method for preparing the compressor titanium alloy blade.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a compressor titanium alloy blade, which comprises the following components by mass content: 6.1% to 6.3% aluminum, 1.8% to 1.9% molybdenum, 2.4% to 2.45% chromium, 0.5% to 0.6% iron, ≤0.07% oxygen, and the balance being titanium.

[0005] The present invention also provides a method for preparing a compressor titanium alloy blade, comprising the following steps: S10, performing a vacuum consumable arc furnace smelting treatment on the raw material to obtain a titanium alloy ingot; S20, performing free forging treatment on the titanium alloy ingot to obtain a titanium alloy forging; S30, hot rolling the titanium alloy forging to obtain a titanium alloy round bar; S40, performing radial forging on the titanium alloy round rod to obtain a first titanium alloy forged rod; S50, performing machining, peeling, flaw detection, and cutting processing on the first titanium alloy forged rod to obtain a second titanium alloy forged rod; S60, performing precision die forging on the second titanium alloy forged rod to obtain a titanium alloy blade; S70. Post-process the titanium alloy blade.

[0006] In one embodiment, in step S10, the raw material is subjected to three vacuum consumable arc furnace smelting treatments, and the titanium alloy ingot includes the following components by mass content: aluminum 6.1% to 6.3%, molybdenum 1.8% to 1.9%, chromium 2.4% to 2.45%, iron 0.5% to 0.6%, oxygen ≤ 0.07%, and the balance is titanium.

[0007] In one embodiment, in step S20, the free forging process includes the following steps: S21, subjecting the titanium alloy ingot to five-fire three-drill three-draw free forging treatment, wherein the heating temperatures of the five fires are 1160° C., 1110° C., 1055° C., 1035° C., and 995° C., respectively, and the heating and holding time of each fire is the minimum size of the titanium alloy forging × 0.41 minutes; S22, performing three-fire, two-blow, two-draw free forging treatment on the titanium alloy forging obtained in step S21, wherein the heating temperatures of the three fires are respectively the phase transition point temperature of the titanium alloy -35°C, and the heating and heat preservation time of each fire is the minimum size of the titanium alloy forging × 0.59 minutes; S23, subjecting the titanium alloy forging obtained in step S22 to two-fire, two-hammer and two-draw free forging treatment, wherein the heating temperatures of the two fires are respectively the phase transition point temperature of the titanium alloy -45°C, and the heating and heat preservation time of each fire is the minimum size of the titanium alloy forging × 0.61 minutes.

[0008] In one embodiment, before each free forging heating, a glass coating having a melting temperature of the heating temperature of the fire + 15° C. is coated on the surface of the titanium alloy forging.

[0009] In one embodiment, in step S30, the titanium alloy forging is subjected to a hot rolling treatment, the heating temperature is the titanium alloy phase transition point temperature -50°C, and before heating, a glass coating with a melting temperature of the titanium alloy phase transition point temperature -35°C is applied to the surface of the titanium alloy forging.

[0010] In one embodiment, in step S40, the titanium alloy round rod is subjected to a heat forging treatment, the heating temperature is the titanium alloy phase transition point temperature -55°C, and before heating, a glass coating with a melting temperature of the titanium alloy phase transition point temperature -40°C is coated on the surface of the titanium alloy round rod.

[0011] In one embodiment, in step S60, the second titanium alloy forged rod is subjected to two-fire precision die forging treatment, the heating temperature is the titanium alloy phase transition point temperature of -58°C, and before heating, a glass coating with a melting temperature of the titanium alloy phase transition point temperature of -43°C is coated on the surface of the second titanium alloy forged rod.

[0012] In one embodiment, in step S70, post-processing includes performing vibration finishing and vibration grinding and polishing on the titanium alloy blade until the surface roughness of the titanium alloy blade Ra≤0.2 μm, wherein titanium nitride powder with a Mohs hardness of 8.7-9 is used as an abrasive.

[0013] In one embodiment, in step S70, the post-processing further includes vacuum annealing and cryogenic treatment of the titanium alloy blade, wherein the annealing temperature is 650°C and the temperature is kept for 1 hour; the cryogenic treatment temperature is -165°C and the temperature is kept for 12 hours.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows: the composition, structure and performance of the titanium alloy blades prepared by the preparation method of the compressor titanium alloy blades of the present invention are uniform and stable, the titanium alloy blades have a reasonable grain orientation distribution, good strength and plasticity matching, and excellent fatigue performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 is a schematic flow chart of a method for preparing a compressor titanium alloy blade according to the present invention; Figure 2 The metallographic structure of a compressor titanium alloy blade prepared according to the method of Example 1 of the present invention; Figure 3 The metallographic structure of a compressor titanium alloy blade prepared according to the method of Example 2 of the present invention; Figure 4 An IPF image of electron backscatter diffraction (EBSD) of a compressor titanium alloy blade prepared according to the method of Example 1 of the present invention; Figure 5 This is an IPF image of electron backscatter diffraction (EBSD) of a compressor titanium alloy blade prepared according to the method of Example 2 of the present invention. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0018] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0019] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0020] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions; the terms "first", "second", etc. in the specification and claims of the present disclosure or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. "Multiple" means two or more, unless otherwise clearly and specifically limited.

[0021] The present invention provides a compressor titanium alloy blade, which includes the following components by mass: 6.1% to 6.3% aluminum, 1.8% to 1.9% molybdenum, 2.4% to 2.45% chromium, 0.5% to 0.6% iron, ≤0.07% oxygen, and the balance is titanium. The compressor titanium alloy blade of the present invention has a uniform composition, and the optimized titanium alloy composition design greatly improves the fatigue performance of the titanium alloy blade.

[0022] like Figure 1 As shown, the present invention provides a method for preparing the above compressor titanium alloy blade, comprising the following steps: S10, subjecting the raw materials to vacuum consumable arc furnace smelting treatment to obtain titanium alloy ingots.

[0023] S20, performing free forging treatment on the titanium alloy ingot to obtain a titanium alloy forging.

[0024] S30, hot rolling the titanium alloy forging to obtain a titanium alloy round bar.

[0025] S40, performing radial forging on the titanium alloy round rod to obtain a first titanium alloy forged rod.

[0026] S50, performing machining, peeling, flaw detection, and cutting processing on the first titanium alloy forged rod to obtain a second titanium alloy forged rod.

[0027] S60, performing precision die forging on the second titanium alloy forged rod to obtain a titanium alloy blade.

[0028] S70. Post-process the titanium alloy blade.

[0029] In a preferred embodiment, in step S10, the raw materials include sponge titanium and master alloy, and the raw materials are subjected to three vacuum consumable arc furnace (VAR) melting treatments. In a preferred embodiment, in step S10, the titanium alloy ingot includes the following components by mass content: aluminum 6.1% to 6.3%, molybdenum 1.8% to 1.9%, chromium 2.4% to 2.45%, iron 0.5% to 0.6%, oxygen ≤ 0.07%, and the balance is titanium.

[0030] In a preferred embodiment, in step S20, the free forging process includes the following steps: S21. The titanium alloy ingot is subjected to five-fire, three-drill and three-draw free forging treatment. The heating temperatures of the five fires are 1160°C, 1110°C, 1055°C, 1035°C and 995°C respectively. The heating and holding time of each fire is the minimum size of the titanium alloy forging (mm) × 0.41 minutes.

[0031] S22, subjecting the titanium alloy forging obtained in step S21 to three-fire, two-hammer and two-draw free forging treatment, wherein the heating temperatures of the three fires are respectively the phase transition point temperature of the titanium alloy -35°C, and the heating and heat preservation time of each fire is the minimum size (mm) of the titanium alloy forging × 0.59 minutes.

[0032] S23, subjecting the titanium alloy forging obtained in step S22 to two-fire, two-hammer and two-draw free forging treatment, wherein the heating temperatures of the two fires are respectively the phase transition point temperature of the titanium alloy -45°C, and the heating and heat preservation time of each fire is the minimum size (mm) of the titanium alloy forging × 0.61 minutes.

[0033] The method of the present invention accurately sets the forging heating temperature and the holding time according to the titanium alloy composition, the hot working fire number and the minimum size of the hot working workpiece, thereby ensuring that the titanium alloy blade has uniform structure and performance. The heated blank of the present invention is cylindrical, and the size of the bottom diameter of the cylinder is smaller than the size of the height, and the bottom diameter has the smallest size in comparison. Therefore, the minimum size of the heated blank of the present invention is the size of the bottom diameter.

[0034] In a preferred embodiment, before each free forging heating, a glass coating having a melting temperature of the heating temperature of the fire + 15° C. is coated on the surface of the titanium alloy forging.

[0035] In a preferred embodiment, in step S30, the titanium alloy forging is subjected to a hot rolling treatment, the heating temperature is the titanium alloy phase transition point temperature -50°C, and before heating, a glass coating with a melting temperature of the titanium alloy phase transition point temperature -35°C is applied to the surface of the titanium alloy forging.

[0036] In a preferred embodiment, in step S40, the titanium alloy round rod is subjected to a fire forging treatment, the heating temperature is the titanium alloy phase transition point temperature -55°C, and before heating, a glass coating with a melting temperature of the titanium alloy phase transition point temperature -40°C is coated on the surface of the titanium alloy round rod.

[0037] In a preferred embodiment, in step S50, after the first titanium alloy forged rod is machined and peeled, it is subjected to flaw detection according to GB / T5193-2020 standard, and then a second titanium alloy forged rod reaching AA grade of GB / T5193-2020 standard is cut.

[0038] In a preferred embodiment, in step S60, the second titanium alloy forged rod is subjected to two-fire precision die forging treatment, the heating temperature is the titanium alloy phase transition point temperature -58°C, and before heating, a glass coating having a melting temperature of the titanium alloy phase transition point temperature -43°C is coated on the surface of the second titanium alloy forged rod. The two-fire precision die forging treatment of one fire for rough deformation and one fire for fine deformation ensures that the size and structure of the titanium alloy blade meet the design requirements.

[0039] Before heating in hot working processes such as free forging, hot rolling, radial forging, and die forging, glass coating with corresponding melting temperature is applied to the surface of titanium alloy workpiece. During heating, the softened glass coating can prevent the titanium alloy workpiece from being oxidized and cracked during the forging process, and also plays a lubricating role. The glass coating can protect the titanium alloy workpiece to the greatest extent, reduce the absorption of oxygen and hydrogen by the titanium alloy workpiece, and improve the uniformity of the composition, organization, and performance of the titanium alloy workpiece. The combination of hot deformation processes of free forging, hot rolling, and radial forging ensures that the flaw detection of titanium alloy forging bars can reach the AA level of GB / T5193 standard.

[0040] In a preferred embodiment, in step S70, the post-processing includes vibratory finishing and vibratory grinding and polishing of the titanium alloy blade until the surface roughness of the titanium alloy blade is Ra≤0.2μm, and titanium nitride powder with a Mohs hardness of 8.7-9 is used as an abrasive. When the surface roughness of the titanium alloy blade reaches Ra0.2, the fatigue performance and aerodynamic efficiency of the titanium alloy blade can be greatly improved. The use of titanium nitride powder with a Mohs hardness of 8.7-9 as a vibratory finishing abrasive avoids the situation where other materials contaminate the surface of the titanium alloy blade.

[0041] In a preferred embodiment, in step S70, the post-treatment further includes vacuum annealing and cryogenic treatment of the titanium alloy blade, wherein the annealing temperature is 650°C and the temperature is kept for 1 hour; the cryogenic treatment temperature is -165°C and the temperature is kept for 12 hours. Cryogenic treatment of the titanium alloy blade at -165°C can stabilize the size of the titanium alloy blade, prevent the titanium alloy blade from deformation, regulate the titanium alloy blade structure and residual stress state, and the compressive stress on the titanium alloy blade surface increases the fatigue life of the titanium alloy blade. The cryogenic treatment replaces the shot peening treatment of the prior art, and improves the surface roughness of the titanium alloy blade.

[0042] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0043] Example 1 The production process of compressor titanium alloy blades with a thickness of 1.2 mm, a width of 13 mm and a length of 52 mm includes the following steps.

[0044] S10. The raw materials are subjected to three VAR smelting processes to form a cylindrical titanium alloy ingot with a diameter of Φ290 and a length of 320 mm.

[0045] In the titanium alloy ingot, the mass content of aluminum is 6.2%, the mass content of molybdenum is 1.84%, the mass content of chromium is 2.41%, the mass content of iron is 0.57%, the mass content of oxygen is 0.06%, and the balance is titanium. The phase transition point temperature of the titanium alloy is measured to be 947℃. After the titanium alloy ingot is peeled and the head and tail are removed, the size is Φ280*300mm.

[0046] S20, performing free forging treatment on the titanium alloy ingot, comprising the following steps: S21. The titanium alloy ingot is subjected to five-fire three-dip three-draw free forging treatment, and the heating temperatures of the five fires are 1160°C, 1110°C, 1055°C, 1035°C, and 995°C, respectively.

[0047] The first fire forging process: Φ280*300mm→drawn into Φ235*420 mm→pierced to a height of 230 mm→drawn into Φ235*420 mm→pierced to a height of 230 mm→drawn into Φ235*420 mm, the heating and insulation time is about 115 minutes (280 mm×0.41), and before forging heating, a glass coating with a melting temperature of 1175℃ (1160℃+15℃) is applied to the surface of the titanium alloy forging.

[0048] The forging process from the second to the fifth fire is: Φ235*420 mm→pier to a height of 230 mm→drawn into Φ235*420 mm→pier to a height of 230 mm→drawn into Φ235*420 mm→pier to a height of 230 mm→drawn into Φ235*420 mm, the heating and insulation time for each fire is about 97 minutes (235 mm *0.41), and before the forging heating from the second to the fifth fire, glass coatings with melting temperatures of 1125℃, 1070℃, 1050℃ and 1010℃ are applied on the surface of the titanium alloy forgings respectively.

[0049] S22, performing three-fire two-bending two-drawing free forging treatment on the titanium alloy forging obtained in step S21, wherein the heating temperature of the three fires is 912°C (947°C-35°C).

[0050] The forging process from the first to the third fire is: Φ235*420 mm→pierced to a height of 230 mm→pulled to Φ235*420 mm→pierced to a height of 230 mm→pulled to Φ235*420 mm. The heating and insulation time for each fire is approximately 139 minutes (235mm*0.59), and before the forging heating from the first to the third fire, a glass coating with a melting temperature of 927°C (912°C+15°C) is applied to the surface of the titanium alloy forging.

[0051] S23, performing two-fire two-turn two-draw free forging treatment on the titanium alloy forging obtained in step S22, wherein the heating temperature of the two fires is 902°C (947°C-45°C).

[0052] The first fire forging process: Φ235*420 mm→pier to height 230 mm→drawn to Φ235*420 mm→pier to height 230 mm→drawn to Φ235*420 mm, the heating and insulation time is about 144 minutes (235mm*0.61), and before forging heating, a glass coating with a melting temperature of 917℃ (902℃+15℃) is applied to the surface of the titanium alloy forging.

[0053] The second forging process: Φ235*420 mm→pier to height 230 mm→drawn to Φ235*420 mm→pier to height 230 mm→drawn to Φ125*1450 mm, the heating and insulation time is about 144 minutes (235mm*0.61), and before forging heating, a glass coating with a melting temperature of 917℃ (902℃+15℃) is applied to the surface of the titanium alloy forging.

[0054] S30, performing one hot rolling treatment on the titanium alloy forging.

[0055] Before hot rolling, a glass coating with a melting temperature of 912°C (947°C-35°C) was applied to the surface of a Φ125*1450 mm titanium alloy forging. The titanium alloy forging was hot rolled once at a heating temperature of 897°C (947°C-50°C) to produce a Φ65 titanium alloy round bar.

[0056] S40, the titanium alloy round bar is subjected to a first-pass diameter forging treatment.

[0057] After grinding the outer surface of the Φ65 titanium alloy round bar into a Φ64 titanium alloy round bar, it is subjected to radial forging. Before heating for radial forging, a glass coating with a melting temperature of 907°C (947°C-40°C) is applied to the surface of the Φ64 titanium alloy round bar. The titanium alloy round bar is subjected to a first radial forging treatment at a heating temperature of 892°C (947°C-55°C) to produce a Φ23 first titanium alloy forged bar.

[0058] S50, machining and peeling the first titanium alloy forged rod of Φ23, cutting it into a second titanium alloy forged rod of Φ21, and ultrasonically inspecting the second titanium alloy forged rod of Φ21 according to GB / T5193-2020 standard.

[0059] S60, performing two-pass precision die forging treatment on the second titanium alloy forged rod.

[0060] Before heating from the first fire to the second fire forging process, a glass coating with a melting temperature of 904°C (947°C-43°C) is applied to the surface of the second titanium alloy forging rod. The second titanium alloy forging rod is subjected to a 2-fire precision forging process at a heating temperature of 889°C (947°C-58°C) to form a titanium alloy blade.

[0061] S70. Post-process the titanium alloy blade.

[0062] Titanium nitride powder with a Mohs hardness of 8.9 was used as an abrasive to vibrate and polish the titanium alloy blades until the surface roughness Ra of the titanium alloy blades averaged 0.186 μm. Then, the titanium alloy blades were vacuum annealed at 650°C for 1 hour and cryogenically treated at -165°C for 12 hours. Thus, a compressor titanium alloy blade with a thickness of 1.2 mm, a width of 13 mm, and a length of 52 mm was produced.

[0063] The compressor titanium alloy blade with a thickness of 1.2 mm, a width of 13 mm, and a length of 52 mm obtained in Example 1 has a microhardness HV of 417, a surface compressive stress of 528 MPa, and a surface roughness Ra average of 0.186 μm. According to HB5277 "Vibration fatigue test method for engine blades and materials", the fatigue limit at a life base of 10 million times is 485 MPa.

[0064] Figure 2 The microstructure of the compressor titanium alloy blade obtained in Example 1 is observed under a metallographic microscope at a magnification of 500 times. From the metallographic structure of the compressor titanium alloy blade, it can be seen that the composition and structure of the compressor titanium alloy blade are uniform and stable.

[0065] Figure 4 This is an IPF diagram of the electron backscatter diffraction (EBSD) of the compressor titanium alloy blade prepared in Example 1. It can be seen from the diagram that the grain orientation distribution of the compressor titanium alloy blade is reasonable.

[0066] Example 2 The production process of compressor titanium alloy blades with a thickness of 1.15 mm, a width of 12 mm and a length of 51 mm includes the following steps.

[0067] S10. The raw materials are subjected to three VAR smelting processes to form a cylindrical titanium alloy ingot with a diameter of Φ280 and a length of 320 mm.

[0068] In the titanium alloy ingot, the mass content of aluminum is 6.21%, the mass content of molybdenum is 1.85%, the mass content of chromium is 2.42%, the mass content of iron is 0.56%, the mass content of oxygen is 0.06%, and the balance is titanium. The phase transition point temperature of the titanium alloy is measured to be 946℃. After the titanium alloy ingot is peeled and the head and tail are removed, the size is Φ270*300mm.

[0069] S20, performing free forging treatment on the titanium alloy ingot, comprising the following steps: S21. The titanium alloy ingot is subjected to five-fire three-dip three-draw free forging treatment, and the heating temperatures of the five fires are 1160°C, 1110°C, 1055°C, 1035°C, and 995°C, respectively.

[0070] The first fire forging process: Φ270*300 mm→drawn into Φ227*420 mm→pier to height 230 mm→drawn into Φ227*420 mm→pier to height 230 mm→drawn into Φ227*420 mm, the heating and insulation time is about 111 minutes (270 mm*0.41), and before forging heating, a glass coating with a melting temperature of 1175℃ (1160℃+15℃) is applied to the surface of the titanium alloy forging.

[0071] The forging process from the second to the fifth fire is: Φ227*420 mm→pier to height 230 mm→drawn into Φ227*420 mm→pier to height 230 mm→drawn into Φ227*420 mm→pier to height 230 mm→drawn into Φ227*420 mm, the heating and insulation time for each fire is about 93 minutes (227 mm *0.41), and before the forging heating from the second to the fifth fire, glass coatings with melting temperatures of 1125℃, 1070℃, 1050℃ and 1010℃ are applied on the surface of the titanium alloy forgings respectively.

[0072] S22, performing three-fire two-bending two-drawing free forging treatment on the titanium alloy forging obtained in step S21, wherein the heating temperature of the three fires is 911° C. (946° C.-35° C.).

[0073] The forging process from the first to the third fire is: Φ227*420 mm→pier to a height of 230 mm→pulled to Φ227*420 mm→pier to a height of 230 mm→pulled to Φ227*420 mm. The heating and insulation time for each fire is approximately 134 minutes (227mm*0.59), and before the forging heating from the first to the third fire, a glass coating with a melting temperature of 926℃ (911℃+15℃) is applied to the surface of the titanium alloy forging.

[0074] S23, performing two-fire two-turn two-draw free forging treatment on the titanium alloy forging obtained in step S22, wherein the heating temperature of the two fires is 901° C. (946° C.-45° C.).

[0075] The first fire forging process: Φ227*420 mm→pier to height 230 mm→drawn to Φ227*420 mm→pier to height 230 mm→drawn to Φ227*420 mm, the heating and insulation time is about 139 minutes (227mm*0.61), and before forging heating, a glass coating with a melting temperature of 916℃ (901℃+15℃) is applied to the surface of the titanium alloy forging.

[0076] The second forging process: Φ227*420 mm→pier to height 230 mm→drawn to Φ227*420 mm→pier to height 230 mm→drawn to Φ120*1470 mm, the heating and insulation time is about 139 minutes (227mm*0.61), and before forging heating, a glass coating with a melting temperature of 916℃ (901℃+15℃) is applied to the surface of the titanium alloy forging.

[0077] S30, performing one hot rolling treatment on the titanium alloy forging.

[0078] Before hot rolling, a glass coating with a melting temperature of 911°C (946°C-35°C) is applied to the surface of a Φ120*1470 mm titanium alloy forging. The titanium alloy forging is hot rolled once at a heating temperature of 896°C (946°C-50°C) to produce a Φ62 titanium alloy round bar.

[0079] S40, the titanium alloy round bar is subjected to a first-pass diameter forging treatment.

[0080] Before the radial forging heating, a glass coating with a melting temperature of 906°C (946°C-40°C) is applied to the surface of the Φ62 titanium alloy round bar. The titanium alloy round bar is subjected to a first radial forging treatment at a heating temperature of 891°C (946°C-55°C) to produce a first titanium alloy forged bar of Φ22.

[0081] S50, machining and peeling the first titanium alloy forged rod of Φ22, cutting it into a second titanium alloy forged rod of Φ20, and ultrasonically inspecting the second titanium alloy forged rod of Φ20 according to GB / T5193-2020 standard.

[0082] S60, performing two-step precision die forging treatment on the second titanium alloy forged rod.

[0083] Before heating from the first fire to the second fire forging process, a glass coating with a melting temperature of 903°C (946°C-43°C) is applied to the surface of the second titanium alloy forging rod. The second titanium alloy forging rod is subjected to a 2-fire precision forging process at a heating temperature of 888°C (946°C-58°C) to form a titanium alloy blade.

[0084] S70. Post-process the titanium alloy blade.

[0085] Titanium nitride powder with a Mohs hardness of 8.8 was used as an abrasive to vibrate and polish the titanium alloy blades until the surface roughness Ra of the titanium alloy blades averaged 0.183 μm. Then, the titanium alloy blades were vacuum annealed at 650°C for 1 hour and cryogenically treated at -165°C for 12 hours. Thus, a compressor titanium alloy blade with a thickness of 1.15 mm, a width of 12 mm, and a length of 51 mm was produced.

[0086] The compressor titanium alloy blade with a thickness of 1.15 mm, a width of 12 mm, and a length of 51 mm obtained in Example 2 has a microhardness HV of 409, a surface compressive stress of 534 MPa, and a surface roughness Ra average of 0.183 μm. According to HB5277 "Vibration fatigue test method for engine blades and materials", the fatigue limit at a life base of 10 million times is 495 MPa.

[0087] Figure 3 The microstructure of the compressor titanium alloy blade obtained in Example 2 is observed under a metallographic microscope at a magnification of 500 times. From the metallographic structure of the compressor titanium alloy blade, it can be seen that the composition and structure of the compressor titanium alloy blade are uniform and stable.

[0088] Figure 5 This is the IPF diagram of the electron backscatter diffraction (EBSD) of the compressor titanium alloy blade prepared in Example 2. It can be seen from the diagram that the grain orientation distribution of the compressor titanium alloy blade is reasonable.

[0089] It should be particularly pointed out that the various components or steps in the above-mentioned embodiments can be cross-linked, replaced, added, or deleted with each other. Therefore, the combinations formed by these reasonable arrangements and combinations should also fall within the scope of protection of the present invention, and the scope of protection of the present invention should not be limited to the embodiments.

[0090] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A compressor titanium alloy blade, characterized in that: The compressor titanium alloy blade includes the following components by mass: aluminum 6.1% to 6.3%, molybdenum 1.8% to 1.9%, chromium 2.4% to 2.45%, iron 0.5% to 0.6%, oxygen ≤ 0.07%, and the balance is titanium.

2. A method for preparing a compressor titanium alloy blade according to claim 1, characterized in that: The following steps are involved: S10, performing a vacuum consumable arc furnace smelting treatment on the raw material to obtain a titanium alloy ingot; S20, performing free forging treatment on the titanium alloy ingot to obtain a titanium alloy forging; S30, hot rolling the titanium alloy forging to obtain a titanium alloy round bar; S40, performing radial forging on the titanium alloy round rod to obtain a first titanium alloy forged rod; S50, performing machining, peeling, flaw detection, and cutting processing on the first titanium alloy forged rod to obtain a second titanium alloy forged rod; S60, performing precision die forging on the second titanium alloy forged rod to obtain a titanium alloy blade; S70. Post-process the titanium alloy blade.

3. The method for preparing a compressor titanium alloy blade according to claim 2, characterized in that: In step S10, the raw material is subjected to three vacuum consumable arc furnace smelting treatments, and the titanium alloy ingot includes the following components by mass content: aluminum 6.1% to 6.3%, molybdenum 1.8% to 1.9%, chromium 2.4% to 2.45%, iron 0.5% to 0.6%, oxygen ≤ 0.07%, and the balance is titanium.

4. The method for preparing a compressor titanium alloy blade according to claim 2, characterized in that: In step S20, the free forging process includes the following steps: S21, subjecting the titanium alloy ingot to five-fire three-drill three-draw free forging treatment, wherein the heating temperatures of the five fires are 1160° C., 1110° C., 1055° C., 1035° C., and 995° C., respectively, and the heating and holding time of each fire is the minimum size of the titanium alloy forging × 0.41 minutes; S22, performing three-fire, two-blow, two-draw free forging treatment on the titanium alloy forging obtained in step S21, wherein the heating temperatures of the three fires are respectively the phase transition point temperature of the titanium alloy -35°C, and the heating and heat preservation time of each fire is the minimum size of the titanium alloy forging × 0.59 minutes; S23, subjecting the titanium alloy forging obtained in step S22 to two-fire, two-hammer and two-draw free forging treatment, wherein the heating temperatures of the two fires are respectively the phase transition point temperature of the titanium alloy -45°C, and the heating and heat preservation time of each fire is the minimum size of the titanium alloy forging × 0.61 minutes.

5. The method for preparing a compressor titanium alloy blade according to claim 4, characterized in that: Before each free forging heating, a glass coating having a melting temperature of the heating temperature of the fire + 15°C is coated on the surface of the titanium alloy forging.

6. The method for preparing a compressor titanium alloy blade according to claim 2, characterized in that: In step S30, the titanium alloy forging is subjected to a hot rolling treatment, the heating temperature is the titanium alloy phase transition point temperature -50°C, and before heating, a glass coating with a melting temperature of the titanium alloy phase transition point temperature -35°C is coated on the surface of the titanium alloy forging.

7. The method for preparing a compressor titanium alloy blade according to claim 2, characterized in that: In step S40, the titanium alloy round rod is subjected to a heat forging treatment, the heating temperature is the titanium alloy phase transition point temperature -55°C, and before heating, a glass coating with a melting temperature of the titanium alloy phase transition point temperature -40°C is coated on the surface of the titanium alloy round rod.

8. The method for preparing a compressor titanium alloy blade according to claim 2, characterized in that: In step S60, the second titanium alloy forged rod is subjected to two-fire precision die forging treatment, the heating temperature is the titanium alloy phase transition point temperature -58°C, and before heating, a glass coating with a melting temperature of the titanium alloy phase transition point temperature -43°C is coated on the surface of the second titanium alloy forged rod.

9. The method for preparing a compressor titanium alloy blade according to claim 2, characterized in that: In step S70, post-processing includes performing vibration finishing and vibration grinding and polishing on the titanium alloy blade until the surface roughness of the titanium alloy blade is Ra≤0.2 μm, wherein titanium nitride powder with a Mohs hardness of 8.7-9 is used as an abrasive.

10. The method for preparing a compressor titanium alloy blade according to claim 9, characterized in that: In step S70, the post-processing further includes vacuum annealing and cryogenic treatment of the titanium alloy blade, wherein the annealing temperature is 650°C and the temperature is kept for 1 hour; the cryogenic treatment temperature is -165°C and the temperature is kept for 12 hours.

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