A method for producing GH4169 high-pressure turbine disk forgings

Abstract

This invention provides a method for producing a GH4169 high-pressure turbine disk forging, comprising the following steps: A) machining a GH4169 alloy ingot to initially deform it; B) heating the GH4169 alloy billet obtained in step A) and then upsetting it; C) sequentially machining a center hole, performing corrosion testing, and cladding on the GH4169 alloy disc blank obtained in step B), followed by hot forging, and finally water cooling to obtain the GH4169 high-pressure turbine disk forging. The production method provided in this application achieves the preparation of forgings using the above-mentioned processes, and the resulting product has accurate dimensions, meets customer requirements, and solves the problems of difficult forming and narrow hot forming window in forging.

Description

Technical Field

[0001] This invention relates to the field of alloy processing technology, and in particular to a method for producing GH4169 high-pressure turbine disk forgings. Background Technology

[0002] High-purity GH4169 alloy high-pressure turbine disks are key components for a certain aircraft engine. Previously, imported blanks were the main source of materials. Now, my country has independently developed and mass-produced these products, which have high social and economic value.

[0003] The structural schematic diagram of the disc-shaped forging involved in this research is shown below. Figure 1 As shown in the figure, the high-pressure turbine disk forging has a complex shape and large dimensional variations, making it prone to deformation dead zones. Furthermore, its small planar projection area and large axial height differences make billet preparation and die forging extremely difficult. Simultaneously, the alloy exhibits high resistance to hot deformation, low thermoplasticity, and a narrow hot working range, making processing difficult, technically demanding, and challenging to research and produce. Under these circumstances, in product design, mold design, and process control, the applicant, through extensive analysis, simulation, and research, optimized the process flow, overcoming numerous technical challenges such as the difficulty in forming forgings and the narrow hot forming window. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a method for producing GH4169 high-pressure turbine disk forgings. The production method provided by this application solves the problems of difficult forming of forgings and narrow hot forming window.

[0005] In view of this, this application provides a method for producing a GH4169 high-pressure turbine disk forging, comprising the following steps:

[0006] A) Process the GH4169 alloy ingot to initially deform it;

[0007] B) Heat the GH4169 alloy billet obtained in step A) and then upset it;

[0008] C) The GH4169 alloy blank obtained in step B) is sequentially machined with a center hole, subjected to corrosion inspection and cladding, then hot forged, and finally water-cooled to obtain the GH4169 high-pressure turbine disk forging.

[0009] Preferably, in step A), the processing is used to thin the two ends of the GH4169 alloy ingot, increasing the deformation by 8-12%.

[0010] Preferably, in step B), the heating method is stepped heating, wherein the first heating temperature is 700-900℃ and the temperature is held for 1-3 hours, and the second heating temperature is 1000-1100℃ and the temperature is held for 1-2 hours.

[0011] Preferably, the upsetting deformation is 65% to 70%.

[0012] Preferably, in step C), the heating method for hot forging is stepped heating, wherein the first heating temperature of the stepped heating is 700-900℃ and the holding time is 1-3 hours, and the second heating temperature is 1000-1100℃ and the holding time is 1-2 hours.

[0013] Preferably, the deformation amount of the hot forging is 60% to 90%.

[0014] Preferably, the water cooling temperature is <60°C.

[0015] Preferably, the hot forging process further includes a heat preservation measure, which specifically includes:

[0016] A first aluminum silicate fiber plate is placed in the lower cavity of the forging die, and then the GH4169 alloy blank is placed in the die and a second aluminum silicate fiber plate is placed on the surface.

[0017] Preferably, the thickness of the first aluminum silicate fiberboard is 3-5 mm, and the thickness of the second aluminum silicate fiberboard is 3-5 mm.

[0018] Preferably, the upsetting is carried out in a 10,000-ton hydraulic press, and the hot forging is carried out in a 30,000-ton hydraulic press.

[0019] This application provides a method for producing GH4169 high-pressure turbine disk forgings. First, the GH4169 alloy ingot is machined to initially deform it. Then, it is heated and upset to form a pre-fabricated blank that is easy to machine. Next, the blank undergoes sequential machining of a center hole, corrosion inspection, and cladding. Finally, it is hot-forged and water-cooled to obtain the GH4169 high-pressure turbine disk forging. The production method provided in this application achieves accurate dimensional accuracy of the forging, meeting customer requirements, and solves the problems of difficult forming and narrow hot forming window (reflected in the forging temperature control of 1050–1100℃). Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structural dimensions of the GH4169 high-pressure turbine disk forging of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the GH4169 high-pressure turbine disk forging after initial machining according to the present invention;

[0022] Figure 3 This is a schematic diagram of the deformation process of the GH4169 high-pressure turbine disk forging blank of the present invention;

[0023] Figure 4 A photograph of the GH4169 high-pressure turbine disk forging prepared for Example 1 of the present invention. Detailed Implementation

[0024] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims of the present invention.

[0025] In view of the problems of small processing temperature range and difficult forming of GH4169 high-pressure turbine disk hot forgings in the prior art, this invention discloses a method for producing GH4169 high-pressure turbine disk forgings. By introducing bar upsetting to form a blank and hot forging, the method achieves precise preparation of high-pressure turbine disk forgings and results in high-performance high-pressure turbine disk forgings. Specifically, this application provides a method for producing GH4169 high-pressure turbine disk forgings, including the following steps:

[0026] A) Process the GH4169 alloy ingot to initially deform it;

[0027] B) Heat the GH4169 alloy billet obtained in step A) and then upset it;

[0028] C) The GH4169 alloy blank obtained in step B) is sequentially machined with a center hole, subjected to corrosion inspection and cladding, then hot forged, and finally water-cooled to obtain the GH4169 high-pressure turbine disk forging.

[0029] In the preparation process of the GH4169 high-pressure turbine disk forging, this application first performs machining on the GH4169 alloy ingot to initially deform the alloy ingot. In one specific embodiment, a schematic diagram of the above-mentioned machining forming of the GH4169 alloy ingot is shown below. Figure 2 As shown, it can better fill the R-angle of the forging and increase the deformation by thinning the ends, thereby increasing the deformation by 8% to 12%.

[0030] According to the present invention, the processed GH4169 alloy billet is then heated and upset; the heating method is stepped heating, wherein the first heating temperature of the stepped heating is 700-900℃ and held for 1-3 hours, and the second heating temperature is 1000-1100℃ and held for 1-2 hours; this stepped heating method can gradually heat the billet, making the billet heat more evenly and more conducive to the entire billet being heated through.

[0031] In one specific embodiment, the upsetting is carried out in a 10,000-ton hydraulic press, which directly upsets the bar billet to a cake billet with a deformation amount of 65% to 70%. The above-mentioned large deformation upsetting is conducive to obtaining a uniform deformed structure, avoiding leaving the original metallurgical structure, improving mechanical properties and refining grains.

[0032] According to the present invention, the upset blank is then subjected to machining center hole, corrosion inspection and sheathing in sequence. The machining center hole, corrosion inspection and sheathing are technical means well known to those skilled in the art, and this application does not impose any special restrictions on them.

[0033] This application then performs hot forging on the prepared blank, followed by water cooling, to obtain the GH4169 high-pressure turbine disk forging. The hot forging process employs a stepped heating method. The first heating temperature is 700–900℃, held for 1–3 hours, and the second heating temperature is 1000–1100℃, held for 1–2 hours. This stepped heating method allows the blank to be heated gradually, resulting in more uniform heating and better heat penetration, which is beneficial for the subsequent forging process. The specific forging method is performed according to methods well known to those skilled in the art, and this application does not impose any particular restrictions, to ensure the blank is properly formed after forging. In a specific embodiment, the deformation during forging is 60%–90%. More specifically, the forging is performed in a 30,000-ton hydraulic press. In this application, the schematic diagram of the process from upsetting to forging is shown below. Figure 3 As shown. Finally, the initial product after die forging is water-cooled at a temperature <60℃, specifically 30-50℃. To prevent a significant temperature drop in the billet before die forging, this application employs heat preservation measures, specifically:

[0034] A first aluminum silicate fiber plate is placed in the lower cavity of the forging die, and then the GH4169 alloy blank is placed in the die and a second aluminum silicate fiber plate is placed on the surface.

[0035] For the thermal insulation materials of this application - the first aluminum silicate fiberboard and the second aluminum silicate fiberboard, the thickness of the first aluminum silicate fiberboard is 3-5 mm and the thickness of the second aluminum silicate fiberboard is 3-5 mm.

[0036] To further understand the present invention, the production method of the GH4169 high-pressure turbine disk forging provided by the present invention will be described in detail below with reference to the embodiments. The scope of protection of the present invention is not limited by the following embodiments.

[0037] Example 1

[0038] 1) Bar blank processing: Bar blank processing facilitates die forging, better fills the radius of curvature of the product, and increases the deformation by thinning both ends, increasing the deformation by 10%; structural and dimensional diagrams are shown below. Figure 2 As shown;

[0039] 2) Billet heating: The billet obtained in step 1) is subjected to a stepped heating curve. Specifically, it is first held at 800℃ for 2 hours, and then held at 1050℃ for 2 hours. Stepped heating allows the billet to be heated gradually and more evenly, so that the entire billet is thoroughly heated.

[0040] 3) Upsetting: The GH4169 alloy high-pressure turbine disk forging bar obtained in step 2) is upset in a 10,000-ton hydraulic press from a height of 480mm to 150±10mm. After upsetting, the sleeve is removed and air-cooled to obtain a bar sheet.

[0041] 4) Die forging: After upsetting, the billet undergoes center hole machining, corrosion inspection, and a sleeve process. It is then heated in a stepped manner, first held at 800℃ for 2 hours, then at 1050℃ for 2 hours. Die forging is then performed on a 30,000-ton hydraulic press with a forging height of 52+5 / -2mm. After die forging, it is water-cooled (<60℃) and the sleeve is removed to obtain the desired result. Figure 4 The high-pressure turbine disk forging shown.

[0042] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for producing a GH4169 high-pressure turbine disk forging, comprising the following steps: A) Process the GH4169 alloy ingot to initially deform it; B) The GH4169 alloy billet obtained in step A) is heated and then upset; the heating method is stepped heating, the first heating temperature is 700~900℃, held for 1~3 hours, the second heating temperature is 1000~1100℃, and held for 1~2 hours; the upsetting deformation is 65%~70%; C) The GH4169 alloy blank obtained in step B) is sequentially machined with a center hole, subjected to corrosion inspection, and clad, then hot-forged, and finally water-cooled to obtain a GH4169 high-pressure turbine disk forging. The hot forging is performed using stepped heating, with the first heating temperature at 700~900℃ and held for 1~3 hours, and the second heating temperature at 1000~1100℃ and held for 1~2 hours. The water cooling temperature is <60℃. The deformation of the hot forging is 60%~90%.

2. The production method according to claim 1, characterized in that, In step A), the processing is used to thin the two ends of the GH4169 alloy ingot, increasing the deformation by 8-12%.

3. The production method according to claim 1, characterized in that, The hot forging process also includes a heat preservation measure, which specifically includes: A first aluminum silicate fiber plate is placed in the lower cavity of the forging die, and then the GH4169 alloy blank is placed in the die and a second aluminum silicate fiber plate is placed on the surface.

4. The production method according to claim 3, characterized in that, The thickness of the first aluminum silicate fiberboard is 3~5mm, and the thickness of the second aluminum silicate fiberboard is 3~5mm.

5. The production method according to claim 1, characterized in that, The upsetting is carried out in a 10,000-ton hydraulic press, and the hot forging is carried out in a 30,000-ton hydraulic press.

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