A method of forging a homogenized fine-grained superalloy disk

Abstract

The application discloses a forging method of a homogeneous fine-grain high-temperature alloy disc piece, wherein first, a high-temperature alloy ingot is heated to 800-900 DEG C, alloy powder is uniformly sprayed on the surface of the high-temperature alloy ingot, and the high-temperature alloy ingot is heated to 1150-1200 DEG C; the high-temperature alloy ingot is forged into a bar, the bar is sawed and turned to obtain a blank, then alloy powder is uniformly sprayed on the surface of the blank, and the blank is preheated by an electron beam to obtain a preheated blank; then the preheated blank is pre-upset, and the pre-upset blank is put into a preheated die to be die forged into a disc piece with an outer circle contour diameter of D, and post-processing is performed, so that the disc piece is obtained. The forging method is simple, does not need to depend on special equipment such as a high-tonnage press, and can obtain a homogeneous fine-grain product with uniform structure and excellent comprehensive performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of forging, and particularly relates to a forging method of a homogeneous fine-grain high-temperature alloy disc piece. BACKGROUND

[0002] High-temperature alloy is an important structural material in modern mechanical manufacturing industry, and is widely used in key components of hot end of an aero-engine and a gas turbine. The high-temperature alloy can resist oxidation and corrosion under high-temperature environment, and can serve for a long time under certain stress. Homogeneous fine grain is one of important performance indexes of the high-temperature alloy product. However, the high-temperature alloy has a narrow deformation temperature zone and a large deformation resistance, so the mixed grain phenomenon is prone to occur in the forging process, which leads to that the grain size requirement of the product is not up to standard, and indexes such as tensile property of the product are reduced or even unqualified.

[0003] The high-temperature alloy disc piece is an important hot-end load-bearing component, and is used for preparing a rotor and a casing of an aero-engine and a space engine, and can bear a huge centrifugal force and thermal stress for a long time under a certain temperature.

[0004] The traditional forging process route of the high-temperature alloy disc piece is as follows: taking the high-temperature alloy as raw material, homogenizing treatment, blooming forging, high-temperature treatment, upsetting, and obtaining the disc piece. The traditional forging process route has the following problems:

[0005] 1. In order to obtain sufficient strengthening level, the high-temperature alloy disc piece needs to be rapidly cooled at a certain rate after solid solution heat treatment, but at the same time, quenching cracking problem is caused, leading to unqualified product quality;

[0006] 2. The high-temperature alloy cannot change the austenite grain size through phase transformation recrystallization, and the product organization uniformity has strong dependence on the processing equipment. The recrystallization of the ordinary processing equipment on the high-temperature alloy is not conducive, controllability is poor, and problems such as more deformation dead zones, more coarse grains and mixed grains are prone to occur, which affect the product quality.

[0007] Patent CN116329442A discloses a high-temperature alloy large special-shaped ring forging forming method. The sawed high-temperature alloy bar is heated to 850 DEG C and kept, then heated to 985 DEG C and kept, and finally heated to 1160 DEG C and kept. The high-temperature alloy bar heated and kept is upset, punched, pre-rolled, expanded, and finally obtained. The forging piece. The patent application cannot avoid the occurrence of mixed grain and other phenomena in the forging process, and the product quality cannot be guaranteed.

[0008] Patent application CN116159955A discloses a large high-temperature alloy annular forging process, first cutting the corresponding length of magnesium alloy extrusion rod or removing the ingot billet section, punching step: using high-temperature gas furnace to heat the blank to 1026-1054℃, and keeping warm for 1.5-3.5 hours, then taking the blank out of the high-temperature gas furnace and transporting it to a 3000T press, the transfer time is controlled within 30 seconds, and the blank is roughed and punched, and the operation time is completed within 180 seconds. When the blank is punched, the blank is heated by the high-temperature gas furnace to facilitate softening operation, and the blank is coated with a heat preservation coating after punching to facilitate heat preservation of the heated blank, preventing the blank from cooling too fast during processing and shortening the processing time. The patent application mainly relies on a 3000T press to realize product quality control, which affects popularization and application. SUMMARY

[0009] In view of the deficiencies of the prior art, the purpose of the present application is to provide a forging method for homogeneous fine-grained high-temperature alloy disc pieces, which is homogeneous and fine-grained, has uniform product organization and excellent comprehensive performance.

[0010] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0011] A forging method for homogeneous fine-grained high-temperature alloy disc pieces, the specific steps are as follows:

[0012] (1) first heat the high-temperature alloy ingot to 800-900℃, and uniformly spray alloy powder on its surface, and heat to 1150-1200℃;

[0013] (2) forge into a rod, saw cut and turn the rod to obtain a blank, then uniformly spray alloy powder on the surface of the blank, and electron beam heating pretreatment to obtain a pretreated blank;

[0014] (3) then pre-upset the preformed blank, put it into a preheated die, and die form to obtain a disc piece with an outer circle contour diameter of D, and post-treatment, to obtain a homogeneous fine-grained high-temperature alloy disc piece;

[0015] The high-temperature alloy ingot is obtained by smelting and casting according to the following weight percentage of chemical composition: C: 0.20-0.22%, Si: 0.08-0.1%, Mn: 1.2-1.5%, Cr: 1.1-1.2%, Mo: 0.05-0.06%, Zr: 0.03-0.04%, V: 0.01-0.02%, N: 0.009-0.012%, Ce: 0.009-0.01%, Al: 0.02-0.04%, S: ≤0.01%, P: ≤0.01%, and the balance is Fe and other unavoidable impurity elements;

[0016] The post-treatment includes heating, cooling with hot water under ultrasonic oscillation, pulse electric field treatment, cooling with ice water, deep cooling with liquid nitrogen, and two-stage aging treatment.

[0017] Preferably, the diameter D of the disc is 100-1000 mm; the superalloy ingot is a cylinder with a diameter of 1.05-1.1D and a height of 8-10D; the diameter of the rod is 0.52-0.55D; the diameter of the blank is 0.47-0.48D and the height is 1.2-1.3D; the pre-upsetting is to a diameter of 0.78-0.82D and a height of 0.25-0.35D.

[0018] Preferably, in step (1), the superalloy ingot is prepared by vacuum induction melting, electroslag remelting or vacuum consumable arc remelting.

[0019] Preferably, in steps (1) and (2), the alloy powder and the superalloy ingot have the same composition.

[0020] Preferably, in steps (1) and (2), plasma spraying is used, and the specific process parameters are as follows: argon-hydrogen mixed gas with a volume ratio of 6:1 is used as the plasma working gas, Ar is used as the powder carrying gas, the power is 30-50 kW, the spraying voltage is 30-50 V, the current is 500-700 A, the working gas flow rate is 35-45 L / min, the powder carrying gas flow rate is 3-5 L / min, and the powder feeding rate is 20-30 g / min.

[0021] Preferably, in steps (1) and (2), the sprayed alloy powder forms a coating with a thickness of 0.01-0.02 mm.

[0022] Preferably, in step (2), the process conditions for the electron beam heating pretreatment are as follows: the vacuum degree is 3x10 -2 ~ 5x10 - 2 Pa, the power is 3-5 kW, the current is 30-50 mA, and the treatment time is 12-15 minutes.

[0023] Preferably, in step (3), the mold is preheated to the same temperature as the preform.

[0024] Preferably, in step (3), the specific method of post-treatment is as follows: first, heat the disc to 1150-1200°C at a rate of 10-15°C / min and keep it at this temperature for 80-100 minutes, then completely immerse the disc in hot water at 80-90°C, treat it with 500-700 W ultrasonic oscillation for 5-6 minutes, take it out, treat it with pulse electric field, then completely immerse it in ice water at 0°C and let it stand for 5-10 minutes, then treat it with deep cooling with liquid nitrogen for 30-40 minutes, take it out and let it recover to room temperature naturally, and finally perform two-stage aging treatment.

[0025] Further preferably, the process conditions of the pulse electric field treatment are as follows: output voltage 800-1000V, pulse output frequency 300-400Hz, pulse width 300-400us, and current density 8-10A / mm 2 , and the pulse electric field treatment time is 8-10 minutes.

[0026] Further preferably, the process conditions of the aging treatment are as follows: first, heat preservation at 550-650 DEG C for 2-3 hours under nitrogen atmosphere, and then heat preservation at 800-900 DEG C for 2-3 hours, and natural cooling to room temperature.

[0027] Compared with the prior art, the application has the following beneficial effects:

[0028] The high-temperature alloy ingot is heated to 800-900 DEG C, the alloy powder is uniformly sprayed on the surface of the high-temperature alloy ingot, and the high-temperature alloy ingot is heated to 1150-1200 DEG C; the high-temperature alloy ingot is forged into a bar, the bar is sawed and turned to obtain a blank, then the alloy powder is uniformly sprayed on the surface of the blank, and the blank is pre-treated by electron beam heating to obtain a pre-treated blank; then the pre-treated blank is pre-upset, and is placed in a preheated die to be die formed to obtain a disc piece with an outer circle contour diameter of D, and the disc piece is post-treated to obtain the homogeneous fine-grained high-temperature alloy disc piece. The forging method is simple, and the homogeneous fine-grained product can be obtained without relying on special equipment such as a high-tonnage press, and the product has uniform organization and excellent comprehensive performance.

[0029] The high-temperature alloy ingot is obtained by smelting and casting according to specific chemical components: C, Si, Mn, Cr, Mo, Zr, V, N, Ce, Al, S, P and Fe. Mo, Zr, V, Ce and Al have a synergistic effect, which hinders grain growth and promotes the homogenization and fine grain of the product. For example, zirconium, cerium and vanadium have the effect of refining grains, and molybdenum has the effect of solid solution strengthening. The interaction between these elements promotes the homogenization and fine grain of the product.

[0030] The alloy powder is sprayed twice during the forging process of the high-temperature alloy ingot, the composition of the alloy powder is the same as that of the high-temperature alloy ingot, and the composition of the product is not affected. The alloy powder can repair the micro cracks generated during the forging process in time, and ensure the product quality.

[0031] The pre-treated blank is obtained by electron beam heating pretreatment, which strengthens the interaction between the sprayed alloy powder and the blank, has a fast heating speed, and better realizes the homogenization and fine grain.

[0032] The obtained disc piece is post-processed, specifically including: heating, cooling with hot water under ultrasonic oscillation condition, pulse electric field treatment, cooling with ice water, deep cooling with liquid nitrogen, and two-stage aging treatment. Among them, after the first heating, cooling with hot water under ultrasonic oscillation condition is performed, an appropriate cooling rate is controlled, crack generation is reduced, and ultrasonic oscillation further refines the grain; then, pulse electric field treatment is performed, the pulse electric field treatment promotes atomic diffusion, improves the microstructure, and simultaneously instantaneously heats up, combined with subsequent ice water cooling and deep cooling with liquid nitrogen, further homogenizes the grain; finally, through the cooperation of two-stage aging treatment, the fine grain is homogenized, the product with uniform structure is obtained, and the comprehensive performance is excellent. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] Unless otherwise specified, all goods in the present application are purchased through market channels.

[0035] For comparison, the same size disc piece with a diameter of 100 mm is obtained by processing the examples and comparative examples.

[0036] Example 1

[0037] A forging method of a homogenously fine-grained high-temperature alloy disc piece, the specific steps are as follows:

[0038] (1) first heat the high-temperature alloy ingot to 800℃, uniformly spray alloy powder on the surface, and heat to 1150℃;

[0039] (2) forge into a bar, cut and turn the bar to obtain a blank, then uniformly spray alloy powder on the surface of the blank, and obtain a pretreated blank by electron beam heating pretreatment;

[0040] (3) then pre-upset the preformed blank, put it into a preheated die, and die form to obtain a disc piece with an outer circle contour diameter of D, and then post-process, to obtain a homogenously fine-grained high-temperature alloy disc piece;

[0041] The high-temperature alloy ingot is smelted and cast according to the following chemical components by weight percentage: C: 0.20%, Si: 0.08%, Mn: 1.2%, Cr: 1.1%, Mo: 0.05%, Zr: 0.03%, V: 0.01%, N: 0.009%, Ce: 0.009%, Al: 0.02%, S: ≤0.01%, P: ≤0.01%, and the balance of Fe and other inevitable impurity elements.

[0042] The post-treatment includes heating, cooling under the condition of ultrasonic oscillation by using hot water, pulse electric field treatment, cooling by using ice water, deep cooling by using liquid nitrogen, and two-stage aging treatment.

[0043] The diameter of the disc piece is 100 mm; the high-temperature alloy ingot is a cylinder with a diameter of 105 mm and a height of 800 mm; the diameter of the rod is 52 mm; the diameter of the blank is 47 mm and the height is 120 mm; the pre-upsetting is to a diameter of 78 mm and a height of 25 mm.

[0044] In step (1), the high-temperature alloy ingot is prepared by vacuum induction melting, electroslag remelting or vacuum consumable arc remelting.

[0045] In steps (1) and (2), the alloy powder has the same composition as the high-temperature alloy ingot.

[0046] In steps (1) and (2), plasma spraying is used, and the specific process parameters are as follows: argon-hydrogen mixed gas with a volume ratio of 6:1 is used as the plasma working gas, Ar is used as the powder carrying gas, the power is 30 kW, the spraying voltage is 30 V, the current is 500 A, the working gas flow rate is 35 L / min, the powder carrying gas flow rate is 3 L / min, and the powder feeding rate is 20 g / min.

[0047] In steps (1) and (2), the sprayed alloy powder forms a coating with a thickness of 0.01 mm.

[0048] In step (2), the process conditions of the electron beam heating pretreatment are as follows: vacuum degree is 3×10 -2 Pa, power is 3 kW, current is 30 mA, and treatment time is 12 minutes.

[0049] In step (3), the mold is preheated to the same temperature as the preform.

[0050] In step (3), the specific method of post-treatment is as follows: first, heat the disc piece to 1150℃ at a rate of 10℃ / min and keep it for 80 minutes, then completely immerse the disc piece in 80℃ hot water, treat it with 500W ultrasonic oscillation for 5 minutes, take it out and treat it with pulse electric field, then completely immerse it in 0℃ ice water and stand for 5 minutes, then treat it with deep cooling by using liquid nitrogen for 30 minutes, take it out and naturally restore it to room temperature, and finally perform two-stage aging treatment.

[0051] The process condition of the pulse electric field treatment is that the output voltage is 800V, the pulse output frequency is 300Hz, the pulse width is 300us, the current density is 8A / mm 2 , and the pulse electric field treatment time is 8 minutes.

[0052] The process condition of the aging treatment is that, under the nitrogen atmosphere, first, the temperature is kept at 550 DEG C for 2 hours, then the temperature is kept at 800 DEG C for 2 hours, and then the temperature is cooled to room temperature naturally.

[0053] Embodiment 2

[0054] A forging method of a homogeneous fine-grained high-temperature alloy disc piece, the specific steps are as follows:

[0055] (1) first heat the high-temperature alloy ingot to 900 DEG C, uniformly spray alloy powder on the surface, and heat to 1200 DEG C;

[0056] (2) forge into a bar, cut and turn the bar to obtain a blank, then uniformly spray alloy powder on the surface of the blank, and obtain a pretreated blank by electron beam heating pretreatment;

[0057] (3) then pre-upset the preformed blank, put it into a preheated die, and die form to obtain a disc piece with an outer circle contour diameter of D, and then post-treat to obtain a homogeneous fine-grained high-temperature alloy disc piece;

[0058] The high-temperature alloy ingot is obtained by smelting and casting according to the following weight percentage chemical composition: C: 0.22%, Si: 0.1%, Mn: 1.5%, Cr: 1.2%, Mo: 0.06%, Zr: 0.04%, V: 0.02%, N: 0.012%, Ce: 0.01%, Al: 0.04%, S: ≤0.01%, P: ≤0.01%, and the balance is Fe and other unavoidable impurity elements;

[0059] The post-treatment includes heating, cooling with hot water under ultrasonic oscillation conditions, pulse electric field treatment, cooling with ice water, deep cooling with liquid nitrogen, and two-stage aging treatment.

[0060] The diameter of the disc piece is 100mm; the high-temperature alloy ingot is a cylinder with a diameter of 110mm and a height of 1000mm; the diameter of the bar is 55mm; the diameter of the blank is 48mm and the height is 130mm; the diameter of the pre-upset is 82mm and the height is 35mm.

[0061] In step (1), the high-temperature alloy ingot is prepared by vacuum induction melting, electroslag remelting or vacuum consumable arc remelting.

[0062] In steps (1) and (2), the alloy powder has the same composition as the high-temperature alloy ingot.

[0063] In step (1) and step (2), plasma spraying is adopted, and the specific process parameters are as follows: argon-hydrogen mixed gas with a volume ratio of 6:1 is used as the plasma working gas, Ar is used as the powder carrying gas, the power is 50 kW, the spraying voltage is 50 V, the current is 700 A, the working gas flow rate is 45 L / min, the powder carrying gas flow rate is 5 L / min, and the powder feeding rate is 30 g / min.

[0064] In step (1) and step (2), the sprayed alloy powder forms a coating with a thickness of 0.02 mm.

[0065] In step (2), the process conditions of electron beam heating pretreatment are as follows: vacuum degree is 5×10 -2 Pa, power is 5 kW, current is 50 mA, and processing time is 15 minutes.

[0066] In step (3), the mold is preheated to the same temperature as the preform.

[0067] In step (3), the specific method of post-treatment is as follows: first, heat the disc to 1200℃ at a rate of 15℃ / min and keep it for 100 minutes, then completely immerse the disc in hot water at 90℃, and perform ultrasonic oscillation treatment at 700W for 6 minutes, take it out and perform pulse electric field treatment, then completely immerse it in ice water at 0℃ and stand for 10 minutes, then use liquid nitrogen for deep cooling treatment for 40 minutes, take it out and naturally restore to room temperature, and finally perform two-stage aging treatment.

[0068] The process conditions of pulse electric field treatment are as follows: output voltage is 1000V, pulse output frequency is 400Hz, pulse width is 400μs, current density is 10A / mm 2 , and pulse electric field treatment time is 10 minutes.

[0069] The process conditions of aging treatment are as follows: first, keep it at 650℃ for 3 hours under nitrogen atmosphere, then keep it at 900℃ for 3 hours, and naturally cool it to room temperature.

[0070] Example 3

[0071] A forging method of a homogeneous fine-grained high-temperature alloy disc is provided, and the specific steps are as follows:

[0072] (1) first heat the high-temperature alloy ingot to 800℃, uniformly spray alloy powder on its surface, and heat to 1200℃;

[0073] (2) forge into a bar, cut and turn the bar to obtain a blank, then uniformly spray alloy powder on the surface of the blank, and perform electron beam heating pretreatment to obtain a pretreated blank;

[0074] (3) then pre-upset the preform, put into the preheated die, die forming, get the disc part of the outer circle profile diameter D, post-processing, namely the homogeneous fine grain superalloy disc part;

[0075] The superalloy ingot is obtained by smelting and casting according to the following chemical composition by weight percentage: C: 0.20%, Si: 0.1%, Mn: 1.2%, Cr: 1.2%, Mo: 0.05%, Zr: 0.04%, V: 0.01%, N: 0.012%, Ce: 0.009%, Al: 0.04%, S: ≤0.01%, P: ≤0.01%, and the balance of Fe and other inevitable impurity elements.

[0076] The post-processing includes: heating, cooling under the condition of ultrasonic oscillation using hot water, pulse electric field treatment, cooling using ice water, deep cooling using liquid nitrogen, and two-stage aging treatment.

[0077] The diameter of the disc part is 100 mm; the superalloy ingot is a cylinder with a diameter of 105 mm and a height of 1000 mm; the diameter of the rod is 52 mm; the diameter of the preform is 48 mm and the height is 120 mm; the pre-upset is to a diameter of 82 mm and a height of 25 mm.

[0078] In step (1), the superalloy ingot is prepared by vacuum induction melting, electroslag remelting or vacuum consumable arc remelting.

[0079] In steps (1) and (2), the alloy powder has the same composition as the superalloy ingot.

[0080] In steps (1) and (2), plasma spraying is used, and the specific process parameters are as follows: argon-hydrogen mixed gas with a volume ratio of 6:1 is used as the plasma working gas, Ar is used as the powder carrying gas, the power is 50 kW, the spraying voltage is 30 V, the current is 700 A, the working gas flow rate is 35 L / min, the powder carrying gas flow rate is 5 L / min, and the powder feeding rate is 20 g / min.

[0081] In steps (1) and (2), the sprayed alloy powder forms a coating with a thickness of 0.02 mm.

[0082] In step (2), the process conditions for electron beam heating pretreatment are as follows: vacuum degree is 3×10 -2 Pa, power is 5 kW, current is 30 mA, and treatment time is 15 minutes.

[0083] In step (3), the die is preheated to the same temperature as the preform.

[0084] In step (3), the specific method of post-treatment is: first, heat the disc piece to 1200℃ at a rate of 10℃ / min, and keep for 80 minutes, then completely immerse the disc piece in hot water at 90℃, and treat with 500W ultrasonic oscillation for 6 minutes, take out and treat with pulse electric field, then completely immerse the disc piece in ice water at 0℃, and keep for 5 minutes, then treat with liquid nitrogen deep cooling for 40 minutes, take out and restore to room temperature naturally, and finally perform two-stage aging treatment.

[0085] The process conditions of pulse electric field treatment are: output voltage is 800V, pulse output frequency is 400Hz, pulse width is 300μs, current density is 10A / mm 2 , and pulse electric field treatment time is 8 minutes.

[0086] The process conditions of aging treatment are: first, keep at 650℃ for 2 hours, then keep at 900℃ for 2 hours under nitrogen atmosphere, and cool to room temperature naturally.

[0087] Example 4

[0088] A forging method of a homogeneous fine-grained high-temperature alloy disc piece, and the specific steps are as follows:

[0089] (1) first heat the high-temperature alloy ingot to 850℃, uniformly spray alloy powder on the surface, and heat to 1180℃;

[0090] (2) forge into a bar, cut and turn the bar to obtain a blank, then uniformly spray alloy powder on the surface of the blank, and perform electron beam heating pretreatment to obtain a pretreated blank;

[0091] (3) then pre-upset the preformed blank, put it into a preheated die, and die form to obtain a disc piece with an outer circle contour diameter of D, and then perform post-treatment to obtain the homogeneous fine-grained high-temperature alloy disc piece;

[0092] The high-temperature alloy ingot is obtained by smelting and casting according to the following weight percentage chemical composition: C: 0.21%, Si: 0.09%, Mn: 1.3%, Cr: 1.15%, Mo: 0.055%, Zr: 0.035%, V: 0.015%, N: 0.01%, Ce: 0.009%, Al: 0.03%, S: ≤0.01%, P: ≤0.01%, and the balance is Fe and other unavoidable impurity elements;

[0093] The post-treatment includes: heating, cooling with hot water under ultrasonic oscillation conditions, pulse electric field treatment, cooling with ice water, liquid nitrogen deep cooling, and two-stage aging treatment.

[0094] The disc has a diameter of 100 mm; the superalloy ingot is a cylinder with a diameter of 108 mm and a height of 900 mm; the rod has a diameter of 53 mm; the blank has a diameter of 48 mm and a height of 125 mm; and the pre-upsetting has a diameter of 80 mm and a height of 30 mm.

[0095] In step (1), the superalloy ingot is prepared by vacuum induction melting, electroslag remelting or vacuum consumable arc remelting.

[0096] In steps (1) and (2), the alloy powder has the same composition as the superalloy ingot.

[0097] In steps (1) and (2), plasma spraying is used, and the specific process parameters are as follows: argon-hydrogen mixed gas with a volume ratio of 6:1 is used as the plasma working gas, Ar is used as the powder carrying gas, the power is 40 kW, the spraying voltage is 40 V, the current is 600 A, the working gas flow rate is 40 L / min, the powder carrying gas flow rate is 4 L / min, and the powder feeding rate is 25 g / min.

[0098] In steps (1) and (2), the sprayed alloy powder forms a coating with a thickness of 0.02 mm.

[0099] In step (2), the process conditions for electron beam heating pretreatment are as follows: vacuum degree is 4x10 -2 Pa, power is 4 kW, current is 40 mA, and treatment time is 13 minutes.

[0100] In step (3), the mold is preheated to the same temperature as the preform.

[0101] In step (3), the specific method of post-treatment is as follows: first, heat the disc to 1180℃ at a rate of 12℃ / min and keep it for 90 minutes, then completely immerse the disc in hot water at 85℃, perform 600W ultrasonic oscillation treatment for 5 minutes, take it out and perform pulse electric field treatment, then completely immerse it in ice water at 0℃ and stand for 8 minutes, then use liquid nitrogen for deep cooling treatment for 35 minutes, take it out and naturally restore it to room temperature, and finally perform two-stage aging treatment.

[0102] The process conditions for pulse electric field treatment are as follows: output voltage is 900V, pulse output frequency is 400Hz, pulse width is 400μs, current density is 9A / mm 2 , and pulse electric field treatment time is 9 minutes.

[0103] The process conditions for aging treatment are as follows: first, keep it at 600℃ for 3 hours under nitrogen atmosphere, then keep it at 850℃ for 2.5 hours, and naturally cool it to room temperature.

[0104] Comparative Example 1

[0105] A forging method of a homogeneous fine-grained high-temperature alloy disc piece, the specific steps are as follows:

[0106] (1) first heat the high-temperature alloy ingot to 1150 DEG C;

[0107] (2) the bar is sawed and machined to obtain a blank, electron beam heating pretreatment is carried out, and a pretreated blank is obtained;

[0108] (3) then, the preformed blank is pre-upset, is put into a preheated die, and is die forged to form a disc piece with an outer circle contour diameter of D, and is post-processed, so that the homogeneous fine-grained high-temperature alloy disc piece is obtained;

[0109] The high-temperature alloy ingot is obtained by smelting and casting according to the following weight percentage chemical composition: C: 0.20%, Si: 0.08%, Mn: 1.2%, Cr: 1.1%, Mo: 0.05%, Zr: 0.03%, V: 0.01%, N: 0.009%, Ce: 0.009%, Al: 0.02%, S: ≤0.01%, P: ≤0.01%, and the balance of Fe and other inevitable impurity elements;

[0110] The post-processing includes heating, cooling with hot water under ultrasonic oscillation conditions, pulse electric field treatment, cooling with ice water, deep cooling with liquid nitrogen, and two-stage aging treatment.

[0111] The diameter of the disc piece is 100 mm; the high-temperature alloy ingot is a cylinder with a diameter of 105 mm and a height of 800 mm; the diameter of the bar is 52 mm; the diameter of the blank is 47 mm and the height is 120 mm; the pre-upset diameter is 78 mm and the height is 25 mm.

[0112] In step (1), the high-temperature alloy ingot is prepared by vacuum induction melting, electroslag remelting or vacuum consumable arc remelting.

[0113] In step (2), the process conditions of the electron beam heating pretreatment are as follows: vacuum degree is 3x10 -2 Pa, power is 3 kW, current is 30 mA, and treatment time is 12 minutes.

[0114] In step (3), the die is preheated to the same temperature as the preformed blank.

[0115] In step (3), the specific method of post-processing is as follows: first, heat the disc piece to 1150 DEG C at a rate of 10 DEG C / min and keep it for 80 min, then completely immerse the disc piece in 80 DEG C hot water, treat it with 500 W ultrasonic oscillation for 5 min, take it out and treat it with pulse electric field, then completely immerse it in 0 DEG C ice water and stand for 5 min, then treat it with liquid nitrogen deep cooling for 30 min, take it out and naturally restore it to room temperature, and finally perform two-stage aging treatment.

[0116] The process conditions of the pulse electric field treatment are as follows: output voltage is 800 V, pulse output frequency is 300 Hz, pulse width is 300 μs, current density is 8 A / mm 2 , and pulse electric field treatment time is 8 minutes.

[0117] The process conditions of the aging treatment are as follows: under a nitrogen atmosphere, first heat preservation at 550 DEG C for 2 hours, then heat preservation at 800 DEG C for 2 hours, and natural cooling to room temperature.

[0118] Comparative Example 2

[0119] A forging method of a homogeneous fine-grained high-temperature alloy disc piece, the specific steps are as follows:

[0120] (1) first heat the high-temperature alloy ingot to 800 DEG C, uniformly spray alloy powder on the surface, and heat to 1150 DEG C;

[0121] (2) forge into a bar, saw cut and turn the bar to obtain a blank, then uniformly spray alloy powder on the surface of the blank, and obtain a pretreated blank by electron beam heating pretreatment;

[0122] (3) then pre-upset the preformed blank, put it into a preheated die, and die form to obtain a disc piece with an outer circle contour diameter of D, and then post-treat to obtain a homogeneous fine-grained high-temperature alloy disc piece;

[0123] The high-temperature alloy ingot is obtained by smelting and casting according to the following weight percentage chemical composition: C: 0.20%, Si: 0.08%, Mn: 1.2%, Cr: 1.1%, Mo: 0.05%, Zr: 0.03%, V: 0.01%, N: 0.009%, Ce: 0.009%, Al: 0.02%, S: ≤0.01%, P: ≤0.01%, and the balance is Fe and other unavoidable impurity elements;

[0124] The post-treatment includes: heating, cooling with hot water under ultrasonic oscillation conditions, cooling with ice water, deep cooling with liquid nitrogen, and two-stage aging treatment.

[0125] The diameter of the disc piece is 100 mm; the high-temperature alloy ingot is a cylinder with a diameter of 105 mm and a height of 800 mm; the diameter of the bar is 52 mm; the diameter of the blank is 47 mm and the height is 120 mm; the diameter is pre-upset to 78 mm and the height is 25 mm.

[0126] In step (1), the high-temperature alloy ingot is prepared by vacuum induction melting, electroslag remelting or vacuum consumable arc remelting.

[0127] In steps (1) and (2), the alloy powder has the same composition as the high-temperature alloy ingot.

[0128] In step (1) and step (2), plasma spraying is adopted, and the specific process parameters are as follows: a mixed gas of argon and hydrogen with a volume ratio of 6:1 is used as the plasma working gas, Ar is used as the powder carrying gas, the power is 30 kW, the spraying voltage is 30 V, the current is 500 A, the working gas flow rate is 35 L / min, the powder carrying gas flow rate is 3 L / min, and the powder feeding rate is 20 g / min.

[0129] In step (1) and step (2), the sprayed alloy powder forms a coating with a thickness of 0.01 mm.

[0130] In step (2), the process conditions of electron beam heating pretreatment are as follows: vacuum degree is 3×10 -2 Pa, power is 3 kW, current is 30 mA, and processing time is 12 minutes.

[0131] In step (3), the mold is preheated to the same temperature as the preform.

[0132] In step (3), the specific method of post-treatment is as follows: first, heat the disc to 1150℃ at a rate of 10℃ / min and keep it for 80 minutes, then completely immerse the disc in hot water at 80℃, and treat it with 500W ultrasonic oscillation for 5 minutes, take it out and treat it with pulse electric field, then completely immerse it in ice water at 0℃ and stand for 5 minutes, then treat it with liquid nitrogen deep cooling for 30 minutes, take it out and naturally restore it to room temperature, and finally perform two-stage aging treatment.

[0133] The process conditions of aging treatment are as follows: first, keep it at 550℃ for 2 hours under nitrogen atmosphere, then keep it at 800℃ for 2 hours, and naturally cool it to room temperature.

[0134] Test example

[0135] The center and edge of the disc are sampled respectively for grain size test, and the chord direction of the disc is sampled for mechanical property test, and the results are shown in Table 1.

[0136] Among them, the grain size test refers to GB / T 6394-2017 “Metal Average Grain Size Determination Method”.

[0137] The mechanical property test refers to GB / T 228.1-2010 “Metal Material Tensile Test Part 1: Room Temperature Test Method” and GB / T 228.2-2015 “Metal Material Tensile Test Part 2: High Temperature Test Method”.

[0138] Ultrasonic flaw detection is used to check the crack situation.

[0139] The test results are shown in Table 1.

[0140] Table 1. Performance test results

[0141]

[0142] From Table 1, it can be seen that the high-temperature alloy disc parts obtained in Examples 1-4 have fine grains, good uniformity, uniform structure and excellent mechanical properties.

[0143] In Comparative Example 1, the alloy powder spraying is omitted, and in Comparative Example 2, the pulse electric field treatment in the post-treatment is omitted, and the uniformity of the structure is obviously deteriorated, and the mechanical properties are also obviously deteriorated, which indicates that the alloy powder spraying and the post-treatment jointly act to improve the microstructure of the disc part, homogenize the fine grains, and further improve the mechanical properties.

[0144] The technical concept of the present application is illustrated by the above examples, but the present application is not limited to the above examples, i.e. it does not mean that the present application must rely on the above examples to be implemented. It should be understood by those skilled in the art that any improvement of the present application, equivalent replacement of individual raw materials of the product of the present application, addition of auxiliary ingredients, selection of specific modes, etc. fall within the protection scope and disclosure scope of the present application.

Claims

1. A method of forging a homogenized fine-grained superalloy disk, characterized in that, The specific steps are as follows: (1) first heat the superalloy ingot to 800-900℃, uniformly spray alloy powder on the surface, heat to 1150-1200℃; (2) forge into a bar, saw and turn the bar to obtain a blank, then uniformly spray alloy powder on the surface of the blank, electron beam heating pretreatment, obtain a pretreated blank; (3) then pre-upset the preformed blank, put it into a preheated die, die forging, obtain a disc piece with an outer circle contour diameter of D, post-treatment, obtain a homogeneous fine-grained superalloy disc piece; The superalloy ingot is obtained by smelting and casting according to the following weight percentage chemical composition: C: 0.20-0.22%, Si: 0.08-0.1%, Mn: 1.2-1.5%, Cr: 1.1-1.2%, Mo: 0.05-0.06%, Zr: 0.03-0.04%, V: 0.01-0.02%, N: 0.009-0.012%, Ce: 0.009-0.01%, Al: 0.02-0.04%, S: ≤0.01%, P: ≤0.01%, the balance being Fe and other unavoidable impurity elements; The post-treatment includes: heating, cooling with hot water under ultrasonic oscillation conditions, pulse electric field treatment, cooling with ice water, deep cooling with liquid nitrogen, two-stage aging treatment; In steps (1) and (2), the alloy powder is the same as the composition of the superalloy ingot; In steps (1) and (2), the sprayed alloy powder forms a coating with a thickness of 0.01-0.02mm; In step (3), the specific method of post-treatment is: first heat the disc piece to 1150-1200℃ at a rate of 10-15℃ / min, keep for 80-100 minutes, then completely immerse the disc piece in 80-90℃ hot water, treat with 500-700W ultrasonic oscillation for 5-6 minutes, take out and treat with pulse electric field, then completely immerse in 0℃ ice water, stand for 5-10 minutes, then treat with deep cooling with liquid nitrogen for 30-40 minutes, take out and naturally restore to room temperature, finally perform two-stage aging treatment.

2. The forging method according to claim 1, characterized by, The diameter D of the disc piece is 100-1000mm; the superalloy ingot is a cylinder with a diameter of 1.05-1.1D and a height of 8-10D; the diameter of the bar is 0.52-0.55D; the diameter of the blank is 0.47-0.48D and the height is 1.2-1.3D; the diameter after pre-upsetting is 0.78-0.82D and the height is 0.25-0.35D.

3. The forging method according to claim 1, characterized by, In step (1), the superalloy ingot is prepared by vacuum induction melting, electroslag remelting or vacuum consumable arc remelting.

4. The forging method of claim 1, wherein In steps (1) and (2), plasma spraying is used, and the specific process parameters are: using argon-hydrogen mixed gas with a volume ratio of 6:1 as the plasma working gas, Ar as the powder carrying gas, power of 30-50kW, spraying voltage of 30-50V, current of 500-700A, working gas flow rate of 35-45L / min, powder carrying gas flow rate of 3-5L / min, and powder feeding rate of 20-30g / min.

5. The forging method of claim 1 wherein, In step (2), the process conditions of electron beam heating pre-treatment are: vacuum degree 3 x 10 -2 ~ 5 x 10 -2 Pa, power 3 ~ 5 kW, current 30 ~ 50 mA, and treatment time 12 ~ 15 minutes.

6. The forging method of claim 1, wherein In step (3), the mold is preheated to the same temperature as the preform.

7. The forging method of claim 1 wherein, The process condition of the pulse electric field treatment is: output voltage is 800-1000V, pulse output frequency is 300-400Hz, pulse width is 300-400μs, current density is 8-10A / mm 2 , pulse electric field treatment time is 8-10 minutes; The process conditions of the aging treatment are as follows: first, 550-650℃ for 2-3 hours, then 800-900℃ for 2-3 hours under nitrogen atmosphere, and naturally cooled to room temperature.

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