Gamma'phase pre-adjusting plasticizing production process of high-performance high-temperature alloy

Abstract

The invention discloses a gamma'phase pre-adjusting plasticizing production process of a high-performance high-temperature alloy, and belongs to the technical field of material processing. The gamma 'phase pre-adjusting plasticizing production process comprises the following preparation steps: 1, smelting is performed to prepare a cast ingot to form a fine-grain homogeneous bar after multi-heating forging; 2, before the bar is forged in a two-phase region, when the heating number forging deformation is higher than the critical cracking deformation, the bar is treated through the gamma'phase pre-adjusting plasticizing technology so as to improve the critical cracking deformation, gamma 'phase pre-adjusting plasticizing adjusts the temperature of the bar subjected to two-phase region forging to be the forging temperature Td, heat preservation is conducted for 2-12 h, then the temperature is reduced to 800-1000 DEG C at the speed of 5-50 DEG C / min, and heat preservation is conducted for 3-12 hours; and 3, the cast ingot or the bar billet obtained in the second step is heated to the forging temperature Td again, heat preservation is conducted, the cast ingot or the bar billet is taken out of a furnace and forged, and a homogeneous bar billet is obtained after multiple times of forging. The hot working high-temperature plasticity of the high-temperature alloy is improved.

Description

technical field

[0001] The application relates to the technical field of material processing, in particular to a production process of γ' phase preadjustment and plasticization of high-performance superalloys. Background technique

[0002] Modern aero-engines with high thrust-to-weight ratio, high reliability and long life require high-performance superalloys. In order to obtain excellent service performance, the mass fraction of γ' strengthening phase in high-performance wrought superalloys (such as GH4710 alloy, GH4720Li alloy and GH4151, etc.) alloys at 700 °C is greater than 40%, which leads to a decrease in the hot workability of superalloys. Low high-temperature plasticity and easy cracking lead to narrow thermal processing window and low yield. Improving high-temperature plasticity while ensuring material properties is a prerequisite for developing high-performance superalloys. At present, the high-performance wrought superalloy adopts the triple smelting process of...

Examples

Embodiment 1

[0037] GH4730 alloy is a wrought superalloy with a mass fraction of γ' phase as high as 42%, and the complete melting temperature of γ' phase is 1090°C.

[0038] Step 1. The GH4730 alloy consumable ingot smelted by vacuum induction melting, electroslag remelting and vacuum consumable remelting process is subjected to two times of upsetting and two times of elongating forging in the single-phase region (1110°C) to obtain Φ480mm bar;

[0039] Step 2. Lower the temperature of the forging heat treatment furnace to 1070°C, and return the Φ480mm bar forged in step 1 to the forging heat treatment furnace. After holding it for 2 hours, cool it down to 900°C at a cooling rate of 20°C / h and keep it for 3 hours;

[0040] Step 3. The bar processed in step 2 is heated up to 1070°C at 10°C / min. After holding for 2 hours, it is taken out of the furnace and enters the forging heat treatment furnace for forging. After forging, return to the forging heat treatment furnace for 2 hours of heat pr...

Embodiment 2

[0043] GH4730 alloy is a wrought superalloy with a mass fraction of γ' phase as high as 42%, and the complete melting temperature of γ' phase is 1090°C.

[0044] Step 1. The GH4730 alloy consumable ingot smelted by vacuum induction melting, electroslag remelting and vacuum consumable remelting is subjected to two upsetting and elongating forging treatments in the single-phase region (1110°C) to obtain a Φ480mm rod material;

[0045] Step 2. Lower the temperature of the forging heat treatment furnace to 1050°C, and return the Φ480mm bar forged in step 1 to the forging heat treatment furnace. After holding it for 2 hours, cool it down to 800°C at a cooling rate of 50°C / h and keep it for 6 hours;

[0046] Step 3. The bar processed in step 2 is heated up to 1050°C at 5°C / min. After holding for 3 hours, it is taken out of the furnace and enters the forging heat treatment furnace for forging. After forging, return to the forging heat treatment furnace for 2 hours of heat preservatio...

Embodiment 3

[0049] GH4730 alloy is a wrought superalloy with a mass fraction of γ' phase as high as 42%, and the complete melting temperature of γ' phase is 1090°C.

[0050] Step 1. The GH4730 alloy consumable ingot smelted by vacuum induction melting, electroslag remelting and vacuum consumable remelting is subjected to two upsetting and elongating forging treatments in the single-phase region (1110°C) to obtain a Φ480mm rod material;

[0051] Step 2. Lower the temperature of the forging heat treatment furnace to 1060°C, and return the Φ480mm bar forged in step 1 to the forging heat treatment furnace. After holding it for 2 hours, cool it down to 1000°C at a cooling rate of 50°C / h and keep it for 5 hours;

[0052] Step 3. The bar processed in step 2 is heated up to 1050°C at 2°C / min. After holding for 4 hours, it is taken out of the furnace and enters the forging heat treatment furnace for forging. After forging, return to the forging heat treatment furnace for 2 hours of heat preservati...

technical field

[0001] The application relates to the technical field of material processing, in particular to a production process of γ' phase preadjustment and plasticization of high-performance superalloys. Background technique

[0002] Modern aero-engines with high thrust-to-weight ratio, high reliability and long life require high-performance superalloys. In order to obtain excellent service performance, the mass fraction of γ' strengthening phase in high-performance wrought superalloys (such as GH4710 alloy, GH4720Li alloy and GH4151, etc.) alloys at 700 °C is greater than 40%, which leads to a decrease in the hot workability of superalloys. Low high-temperature plasticity and easy cracking lead to narrow thermal processing window and low yield. Improving high-temperature plasticity while ensuring material properties is a prerequisite for developing high-performance superalloys. At present, the high-performance wrought superalloy adopts the triple smelting process of...

Examples

Embodiment 1

[0037] GH4730 alloy is a wrought superalloy with a mass fraction of γ' phase as high as 42%, and the complete melting temperature of γ' phase is 1090°C.

[0038] Step 1. The GH4730 alloy consumable ingot smelted by vacuum induction melting, electroslag remelting and vacuum consumable remelting process is subjected to two times of upsetting and two times of elongating forging in the single-phase region (1110°C) to obtain Φ480mm bar;

[0039] Step 2. Lower the temperature of the forging heat treatment furnace to 1070°C, and return the Φ480mm bar forged in step 1 to the forging heat treatment furnace. After holding it for 2 hours, cool it down to 900°C at a cooling rate of 20°C / h and keep it for 3 hours;

[0040] Step 3. The bar processed in step 2 is heated up to 1070°C at 10°C / min. After holding for 2 hours, it is taken out of the furnace and enters the forging heat treatment furnace for forging. After forging, return to the forging heat treatment furnace for 2 hours of heat pr...

Embodiment 2

[0043] GH4730 alloy is a wrought superalloy with a mass fraction of γ' phase as high as 42%, and the complete melting temperature of γ' phase is 1090°C.

[0044] Step 1. The GH4730 alloy consumable ingot smelted by vacuum induction melting, electroslag remelting and vacuum consumable remelting is subjected to two upsetting and elongating forging treatments in the single-phase region (1110°C) to obtain a Φ480mm rod material;

[0045] Step 2. Lower the temperature of the forging heat treatment furnace to 1050°C, and return the Φ480mm bar forged in step 1 to the forging heat treatment furnace. After holding it for 2 hours, cool it down to 800°C at a cooling rate of 50°C / h and keep it for 6 hours;

[0046] Step 3. The bar processed in step 2 is heated up to 1050°C at 5°C / min. After holding for 3 hours, it is taken out of the furnace and enters the forging heat treatment furnace for forging. After forging, return to the forging heat treatment furnace for 2 hours of heat preservatio...

Embodiment 3

[0049] GH4730 alloy is a wrought superalloy with a mass fraction of γ' phase as high as 42%, and the complete melting temperature of γ' phase is 1090°C.

[0050] Step 1. The GH4730 alloy consumable ingot smelted by vacuum induction melting, electroslag remelting and vacuum consumable remelting is subjected to two upsetting and elongating forging treatments in the single-phase region (1110°C) to obtain a Φ480mm rod material;

[0051] Step 2. Lower the temperature of the forging heat treatment furnace to 1060°C, and return the Φ480mm bar forged in step 1 to the forging heat treatment furnace. After holding it for 2 hours, cool it down to 1000°C at a cooling rate of 50°C / h and keep it for 5 hours;

[0052] Step 3. The bar processed in step 2 is heated up to 1050°C at 2°C / min. After holding for 4 hours, it is taken out of the furnace and enters the forging heat treatment furnace for forging. After forging, return to the forging heat treatment furnace for 2 hours of heat preservati...

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