High-performance GH4169G high-temperature alloy rod and preparation method and application thereof

Abstract

The application belongs to the field of hot working of nickel-based wrought superalloy, and particularly relates to a high-performance GH4169G superalloy rod and a preparation method and application thereof. The method comprises the following steps: step 1, preparing a target ingot: selecting a GH4169G alloy ingot prepared by setting a process, and sequentially performing homogenization treatment and machining treatment on the ingot to obtain a target ingot with a high-diameter ratio of 2.0-3.0; step 2, cogging forging: performing 4-6 fire times of radial and axial deformation treatment on the target ingot to obtain a rod blank; and step 3, finished product forging: performing 3-5 fire times of radial deformation treatment on the rod blank to obtain a target rod. The rod prepared by the method can maintain no cracking or continuous cracking for at least 35 h under the condition of 680 DEG C environment and a stress of 690 MPa, and can be applied in the preparation process of aviation parts.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of hot working of nickel-based wrought superalloys, and particularly relates to a high-performance GH4169G superalloy rod and a preparation method and application thereof. BACKGROUND

[0002] The GH4169G alloy is an advanced nickel-based superalloy material independently developed in China. It is developed by using P and B micro-alloy composite strengthening method on the basis of high-quality GH4169 alloy. The GH4169G alloy increases the service temperature from 650 DEG C to 680 DEG C while maintaining the excellent performance of the GH4169 alloy, and does not reduce the mechanical properties and process properties of the GH4169G alloy at 680 DEG C.

[0003] At present, the GH4169G alloy has achieved initial success in the initial development stage, but has not been applied to aviation rotating parts. The main difficulty lies in that although the increase of P and B element content in the alloy realizes performance strengthening, with the increase of industrial production ingot size (Φ508mm), the segregation of the GH4169G alloy is intensified, thereby easily causing rod cracking, low endurance and other problems in the actual forging process. The existing rod forging processing technology in China is not mature enough, which leads to the fact that the GH4169G alloy rod cannot be applied in batch production.

[0004] Therefore, the present application provides a high-performance GH4169G superalloy rod and a preparation method and application thereof to solve the above technical problems. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a high-performance GH4169G superalloy rod and a preparation method and application thereof. The method can prepare a GH4169G superalloy rod with uniform organization by using a set deformation mode and process parameters.

[0006] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0007] On the one hand, the present application provides a preparation method of a high-performance GH4169G superalloy rod, comprising the following steps:

[0008] Step 1, preparing a target ingot: selecting a GH4169G alloy ingot prepared by a set process, and sequentially performing homogenization treatment and machining treatment on the ingot to obtain a target ingot with a height-diameter ratio of 2.0-3.0;

[0009] Step 2, cogging forging: performing 4-6 fire times of radial and axial deformation treatment on the target ingot to obtain a rod blank;

[0010] Step 3, product forging: the bar blank is subjected to 3-5 fire times of radial deformation treatment to obtain a target bar.

[0011] It should be noted that the high-diameter ratio of the target ingot is 2.0-3.0, which is suitable for subsequent cogging forging. If the high-diameter ratio is too large, it is easy to produce folding during subsequent forging. If the high-diameter ratio is too small, it is not conducive to the radial deformation of the material.

[0012] Further, in step 1, the GH4169G alloy ingot is prepared by a VIM+ESR+VAR (vacuum induction melting+electroslag remelting+vacuum consumable remelting ingot) triple smelting process.

[0013] Further, in step 1, the process of homogenizing treatment of the GH4169G alloy ingot in the high-temperature furnace is as follows: the cold charge is loaded into the furnace and heated to 1100-1130℃ at a heating rate of 80-100℃ / h, and then held for 40-50h, then heated to 1160-1190℃ at a heating rate of 2-5℃ / h, and then held for 80-100h, and finally furnace-cooled to 500-850℃ and then air-cooled to room temperature.

[0014] Further, in step 2, the 4-6 fire times of radial and axial deformation treatment are the same in terms of treatment method and parameter value range for each fire time.

[0015] In the first fire time, the radial and axial deformation treatment process is as follows: the target ingot is heated to 1020-1080℃, and the holding time is greater than or equal to 0.6D, then the deformation is performed by first upsetting and then elongating, and the deformation reduction rate during the deformation process is 30-80mm / s, to obtain an intermediate blank, and finally the intermediate blank is subjected to the next fire time of radial and axial deformation treatment.

[0016] Wherein, D is the diameter of the bar before the current fire forging, and in the first fire time of cogging forging, the diameter of the bar is the diameter of the target ingot.

[0017] Specifically, 4-6 fire times of deformation can fully break up the columnar dendritic structure in the target ingot, providing an excellent bar blank for product forging.

[0018] The above holding time is obtained according to the thermal conductivity coefficient of the high-temperature alloy and the actual engineering application, which can ensure that the target ingot is fully heat-penetrated.

[0019] The above deformation reduction rate is conducive to breaking up the columnar dendritic structure in the target ingot.

[0020] Further, in the upsetting process, the axial deformation amount is 15-25%; in the elongating process, the radial deformation amount is 20-25%.

[0021] Further, in the radial deformation treatment of step 3, the treatment mode and parameter range of each fire are the same.

[0022] In the first fire radial deformation treatment process, the bar blank is heated to 1005-1040 DEG C, and the holding time is greater than or equal to 0.4D, then elongation is performed, the deformation rate during elongation is 40-60 mm / s, and an intermediate bar is obtained, and finally the intermediate bar is subjected to the next fire radial deformation treatment.

[0023] In the first fire radial deformation treatment process, the bar blank is heated to 1005-1040 DEG C, and the holding time is greater than or equal to 0.4D, then elongation is performed, the deformation rate during elongation is 40-60 mm / s, and an intermediate bar is obtained, and finally the intermediate bar is subjected to the next fire radial deformation treatment.

[0024] Specifically, through 3-5 fire deformation, the microstructure of the bar blank can be fully recrystallized to obtain an excellent microstructure to ensure the use performance of the material.

[0025] The holding time is obtained according to the thermal conductivity coefficient of the high-temperature alloy and the actual engineering application, and the holding time can ensure that the bar blank is fully heat penetrated.

[0026] Further, in the elongation process, the radial deformation amount is 25-45%, which ensures the minimum energy required for recrystallization of the bar blank.

[0027] On the other hand, the application provides a high-performance GH4169G high-temperature alloy bar prepared by the preparation method, which can maintain at least 35h without cracking or breaking under the stress of 690MPa in the environment of 680 DEG C.

[0028] In another aspect, the application provides a high-performance GH4169G high-temperature alloy bar as described above for preparing an aeronautical component.

[0029] Compared with the prior art, the application has the following beneficial effects:

[0030] The application provides a preparation method of a high-performance GH4169G high-temperature alloy bar, which sets 4-6 fire deformations in the breakdown forging to fully break the columnar dendritic structure in the target ingot, provides an excellent bar blank for finished forging, and further sets 3-5 fire deformations in the finished forging to fully recrystallize the microstructure of the bar blank to ensure the use performance of the material. The application solves the problems of bar cracking and batch production in the alloy forging process, and the prepared GH4169G high-temperature alloy bar has uniform overall microstructure, excellent durability at 680 DEG C, and a service life of more than 35h under the loading condition of 690MPa stress. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate the principles of the application, and, together with the description, serve to explain the application.

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, for those skilled in the art, based on the drawings, other drawings can be obtained without any creative work.

[0033] Figure 1 A flow chart of the preparation method of the GH4169G high-temperature alloy rod of the present application;

[0034] Figure 2 A high-magnification microstructure diagram of a center position of the Φ250mm rod prepared in Embodiment 1 of the present application;

[0035] Figure 3 A high-magnification microstructure diagram of an R / 2 position of the Φ250mm rod prepared in Embodiment 1 of the present application;

[0036] Figure 4 A high-magnification microstructure diagram of an edge position of the Φ250mm rod prepared in Embodiment 1 of the present application. DETAILED DESCRIPTION

[0037] The exemplary embodiments will be described in detail herein below, and the embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples consistent with some aspects of the present application as detailed in the appended claims.

[0038] Embodiment 1

[0039] In one aspect, the present embodiment provides a preparation method of a high-performance GH4169G high-temperature alloy rod, comprising the following steps:

[0040] Step 1, preparing a target ingot: selecting a GH4169G alloy ingot prepared by a VIM+ESR+VAR triple smelting process, and sequentially performing homogenization treatment and machining treatment on the ingot to obtain a target ingot with a high-diameter ratio of 2.6;

[0041] Step 2, cogging forging: performing 4 fire times of radial and axial deformation treatment on the target ingot to obtain a rod blank;

[0042] Step 3, finished product forging: performing 3 fire times of radial deformation treatment on the rod blank to obtain a finished round rod with uniform structure and excellent performance.

[0043] In step 1, the process of homogenizing treatment of the GH4169G alloy ingot in the high-temperature furnace is as follows: the cold material is loaded into the furnace and heated to 1100℃ at a heating rate of 80℃ / h, and then kept for 45h, then heated to 1160℃ at a heating rate of 5℃ / h, and kept for 100h, and finally furnace-cooled to 500℃ and then air-cooled to room temperature;

[0044] Further, the cooled ingot is subjected to machining treatment to remove surface shrinkage and other defects, and a target ingot with a high-diameter ratio of 2.6 is obtained.

[0045] In step 2, the specific process of the 4-fire radial-axial deformation treatment is as follows:

[0046] Specifically, in the first fire, the target ingot is heated to 1050℃, and the holding time is 0.6D (D is the diameter of the target ingot), to ensure that the target ingot is hot through, and then the deformation is performed by the method of first upsetting and then elongating, and the deformation reduction rate is 60mm / s in the deformation process, to obtain an intermediate billet a.

[0047] In the upsetting process, the axial deformation amount is controlled to be 20%, and in the elongating process, the radial deformation amount is controlled to be 23%.

[0048] In the second fire, the intermediate billet a is heated to 1055℃, and the holding time is 0.6D (D is the diameter of the intermediate billet a), and then the deformation is performed by the method of first upsetting and then elongating, and the deformation reduction rate is 60mm / s in the deformation process, to obtain an intermediate billet b.

[0049] In the upsetting process, the axial deformation amount is controlled to be 20%, and in the elongating process, the radial deformation amount is controlled to be 23%.

[0050] In the third fire, the intermediate billet b is heated to 1060℃, and the holding time is 0.7D (D is the diameter of the intermediate billet b), and then the deformation is performed by the method of first upsetting and then elongating, and the deformation reduction rate is 55mm / s in the deformation process, to obtain an intermediate billet c.

[0051] In the upsetting process, the axial deformation amount is controlled to be 19%, and in the elongating process, the radial deformation amount is controlled to be 22%.

[0052] In the fourth fire, the intermediate billet c is heated to 1060℃, and the holding time is 0.7D (D is the diameter of the intermediate billet c), and then the deformation is performed by the method of first upsetting and then elongating, and the deformation reduction rate is 55mm / s in the deformation process, to obtain a regular octagonal rod billet.

[0053] In the upsetting process, the axial deformation amount is controlled to be 19%, and in the elongating process, the radial deformation amount is controlled to be 22%.

[0054] In step 3, the specific process of the 3 times of radial deformation treatment is as follows:

[0055] Specifically, the first time: the bar blank is heated to 1020℃, and the holding time is 0.4D (D is the diameter of the bar blank), and then elongation is performed, and the deformation reduction rate in the process of elongation is 60mm / s, to obtain the intermediate bar a;

[0056] In the process of elongation, the radial deformation amount is controlled to be 42%;

[0057] The second time: the intermediate bar a is heated to 1020℃, and the holding time is 0.45D (D is the diameter of the intermediate bar a), and then elongation is performed, and the deformation reduction rate in the process of elongation is equal to 60mm / s, to obtain the intermediate bar b;

[0058] In the process of elongation, the radial deformation amount is controlled to be 38%;

[0059] The third time: the intermediate bar b is heated to 1025℃, and the holding time is equal to 0.45D (D is the diameter of the intermediate bar b), and then elongation is performed, and the deformation reduction rate in the process of elongation is equal to 55mm / s, to obtain the Φ250 specification GH4169G alloy bar with uniform structure and excellent performance, and the overall structure of the bar is shown in Figures 2 to 4 ;

[0060] In the process of elongation, the radial deformation amount is controlled to be 28%.

[0061] On the other hand, the embodiment provides a high-performance GH4169G high-temperature alloy round bar prepared by the preparation method of the embodiment, which can maintain at least 35h without cracking or continuous cracking in an environment of 680℃ with a stress of 690MPa.

[0062] In another aspect, the embodiment provides a high-performance GH4169G high-temperature alloy round bar as described above, for use in preparing an aviation component.

[0063] Embodiment 2

[0064] In one aspect, the embodiment provides a preparation method of a high-performance GH4169G high-temperature alloy bar, comprising the following steps:

[0065] Step 1, preparing a target ingot: selecting a GH4169G alloy ingot prepared by VIM+ESR+VAR triple smelting process, and sequentially performing homogenization treatment and machining treatment on it to obtain a target ingot with a height-diameter ratio of 2.0;

[0066] Step 2, cogging forging: the target ingot is subjected to 5 fire times of radial-axial deformation treatment to obtain a rod blank;

[0067] Step 3, finished product forging: the rod blank is subjected to 4 fire times of radial deformation treatment to obtain a finished product round bar with uniform structure and excellent performance.

[0068] In step 1, the process of homogenizing treatment of the GH4169G alloy ingot in the high-temperature furnace is as follows: the cold charge is loaded into the furnace and heated to 1115℃ at a heating rate of 90℃ / h, and then held for 50h, then heated to 1175℃ at a heating rate of 2.5℃ / h, and held for 90h, and finally furnace-cooled to 700℃ and air-cooled to room temperature after being discharged from the furnace;

[0069] Further, the cooled ingot is subjected to machining treatment to remove surface shrinkage and other defects, and a target ingot with a high-diameter ratio of 2.0 is obtained.

[0070] In step 2, the specific process of the 5 fire times of radial-axial deformation treatment is as follows:

[0071] Specifically, the first fire time: the target ingot is heated to 1020℃, and the holding time is 0.6D (D is the diameter of the target ingot), to ensure that the target ingot is hot through, and then the deformation is carried out by the method of first upsetting and then elongating, and the deformation pressing rate is 30mm / s in the deformation process to obtain an intermediate blank a;

[0072] In the upsetting process, the axial deformation amount is controlled to be 15%, and in the elongating process, the radial deformation amount is controlled to be 20%;

[0073] The second fire time: the intermediate blank a is heated to 1030℃, and the holding time is 0.6D (D is the diameter of the intermediate blank a), and then the deformation is carried out by the method of first upsetting and then elongating, and the deformation pressing rate is 30mm / s in the deformation process to obtain an intermediate blank b;

[0074] In the upsetting process, the axial deformation amount is controlled to be 15%, and in the elongating process, the radial deformation amount is controlled to be 20%;

[0075] The third fire time: the intermediate blank b is heated to 1030℃, and the holding time is 0.7D (D is the diameter of the intermediate blank b), and then the deformation is carried out by the method of first upsetting and then elongating, and the deformation pressing rate is 35mm / s in the deformation process to obtain an intermediate blank c;

[0076] In the upsetting process, the axial deformation amount is controlled to be 18%, and in the elongating process, the radial deformation amount is controlled to be 22%;

[0077] The intermediate blank c is heated to 1060 DEG C, the holding time is 0.6D (D is the diameter of the intermediate blank c), then the deformation is carried out by the way of upsetting first and then elongating, the deformation reduction rate is 55mm / s in the deformation process, and the intermediate blank d is obtained;

[0078] In the upsetting process, the axial deformation amount is controlled to be 19%, and in the elongating process, the radial deformation amount is controlled to be 22%;

[0079] The intermediate blank d is heated to 1070 DEG C, the holding time is 0.6D (D is the diameter of the intermediate blank d), then the deformation is carried out by the way of upsetting first and then elongating, the deformation reduction rate is 50mm / s in the deformation process, and the octagonal rod blank is obtained;

[0080] In the upsetting process, the axial deformation amount is controlled to be 20%, and in the elongating process, the radial deformation amount is controlled to be 20%.

[0081] In step 3, the specific process of the radial deformation treatment of the 4-time is as follows:

[0082] Specifically, the first time: the rod blank is heated to 1020 DEG C, the holding time is 0.4D (D is the diameter of the rod blank), then elongation is carried out, the deformation reduction rate is 60mm / s in the elongation process, and the intermediate rod a is obtained;

[0083] In the elongation process, the radial deformation amount is controlled to be 45%;

[0084] The intermediate rod a is heated to 1020 DEG C, the holding time is 0.45D (D is the diameter of the intermediate rod a), then elongation is carried out, the deformation reduction rate is equal to 55mm / s in the elongation process, and the intermediate rod b is obtained;

[0085] In the elongation process, the radial deformation amount is controlled to be 40%;

[0086] The intermediate rod b is heated to 1025 DEG C, the holding time is equal to 0.45D (D is the diameter of the intermediate rod b), then elongation is carried out, the deformation reduction rate is equal to 50mm / s in the elongation process, and the intermediate rod c is obtained;

[0087] In the elongation process, the radial deformation amount is controlled to be 30%;

[0088] The intermediate rod c is heated to 1005 DEG C, the holding time is equal to 0.5D (D is the diameter of the intermediate rod c), then elongation is carried out, the deformation reduction rate is equal to 52mm / s in the elongation process, and the finished product round rod with uniform structure and excellent performance is obtained;

[0089] wherein, during the drawing, the radial deformation amount is controlled to be 25%.

[0090] In another aspect, the embodiment provides a high-performance GH4169G high-temperature alloy round bar prepared by the preparation method of the embodiment, which can maintain no cracking or continuous cracking for at least 35 h under the stress of 690 MPa in the environment of 680℃.

[0091] In still another aspect, the embodiment provides the use of the high-performance GH4169G high-temperature alloy round bar as described above in the preparation of aviation parts.

[0092] Embodiment 3

[0093] In one aspect, the embodiment provides a preparation method of a high-performance GH4169G high-temperature alloy bar, comprising the following steps:

[0094] Step 1, preparing a target ingot: selecting a GH4169G alloy ingot prepared by a VIM+ESR+VAR three-union smelting process, and sequentially performing homogenization treatment and machining treatment on the ingot to obtain a target ingot with a high-diameter ratio of 3.0;

[0095] Step 2, cogging forging: performing 6-fire radial-axial deformation treatment on the target ingot to obtain a bar blank;

[0096] Step 3, finished product forging: performing 5-fire radial deformation treatment on the bar blank to obtain a finished product round bar with uniform structure and excellent performance.

[0097] In step 1, the homogenization treatment process of the GH4169G alloy ingot in the high-temperature furnace is as follows: the cold charge is loaded into the furnace and heated to 1130℃ at a heating rate of 100℃ / h, and then held for 40 h, then heated to 1190℃ at a heating rate of 2℃ / h, and held for 80 h, and finally furnace-cooled to 850℃ and air-cooled to room temperature after furnace cooling;

[0098] Further, the machined ingot after cooling is subjected to machining treatment to remove surface shrinkage and other defects to obtain a target ingot with a high-diameter ratio of 3.0.

[0099] In step 2, the specific process of the 6-fire radial-axial deformation treatment is as follows:

[0100] Specifically, the first fire: the target ingot is heated to 1020℃, the holding time is 0.6D (D is the diameter of the target ingot), and the target ingot is ensured to be hot through, then the deformation is performed by the way of upsetting first and then drawing, and the deformation reduction rate is 50 mm / s in the deformation process to obtain an intermediate blank a;

[0101] In the process of upsetting, the axial deformation amount is controlled to be 25%, and in the process of elongating, the radial deformation amount is controlled to be 25%;

[0102] The second heating: the intermediate blank a is heated to 1030℃, the holding time is 0.7D (D is the diameter of the intermediate blank a), then the deformation is carried out by the way of upsetting first and then elongating, the deformation reduction rate is 80mm / s in the process of deformation, and the intermediate blank b is obtained;

[0103] In the process of upsetting, the axial deformation amount is controlled to be 23%, and in the process of elongating, the radial deformation amount is controlled to be 21%;

[0104] The third heating: the intermediate blank b is heated to 1050℃, the holding time is 0.65D (D is the diameter of the intermediate blank b), then the deformation is carried out by the way of upsetting first and then elongating, the deformation reduction rate is 40mm / s in the process of deformation, and the intermediate blank c is obtained;

[0105] In the process of upsetting, the axial deformation amount is controlled to be 19%, and in the process of elongating, the radial deformation amount is controlled to be 21%;

[0106] The fourth heating: the intermediate blank c is heated to 1080℃, the holding time is 0.6D (D is the diameter of the intermediate blank c), then the deformation is carried out by the way of upsetting first and then elongating, the deformation reduction rate is 45mm / s in the process of deformation, and the intermediate blank d is obtained;

[0107] In the process of upsetting, the axial deformation amount is controlled to be 24%, and in the process of elongating, the radial deformation amount is controlled to be 23%;

[0108] The fifth heating: the intermediate blank d is heated to 1070℃, the holding time is 0.6D (D is the diameter of the intermediate blank d), then the deformation is carried out by the way of upsetting first and then elongating, the deformation reduction rate is 65mm / s in the process of deformation, and the intermediate blank e is obtained;

[0109] In the process of upsetting, the axial deformation amount is controlled to be 20%, and in the process of elongating, the radial deformation amount is controlled to be 20%;

[0110] The sixth heating: the intermediate blank e is heated to 1070℃, the holding time is 0.65D (D is the diameter of the intermediate blank e), then the deformation is carried out by the way of upsetting first and then elongating, the deformation reduction rate is 65mm / s in the process of deformation, and the octagonal rod blank is obtained;

[0111] In the process of upsetting, the axial deformation amount is controlled to be 16%, and in the process of elongating, the radial deformation amount is controlled to be 21%.

[0112] In Step 3, the specific process of the 4-time radial deformation treatment is as follows:

[0113] Specifically, the first time: the bar blank is heated to 1005℃, and the holding time is 0.6D (D is the diameter of the bar blank), and then elongation is performed, and the deformation reduction rate during the elongation is 50mm / s, to obtain intermediate bar a;

[0114] In the elongation process, the radial deformation amount is controlled to be 30%;

[0115] The second time: the intermediate bar a is heated to 1040℃, and the holding time is 0.5D (D is the diameter of the intermediate bar a), and then elongation is performed, and the deformation reduction rate during the elongation is equal to 45mm / s, to obtain intermediate bar b;

[0116] In the elongation process, the radial deformation amount is controlled to be 28%;

[0117] The third time: the intermediate bar b is heated to 1010℃, and the holding time is equal to 0.45D (D is the diameter of the intermediate bar b), and then elongation is performed, and the deformation reduction rate during the elongation is equal to 55mm / s, to obtain intermediate bar c;

[0118] In the elongation process, the radial deformation amount is controlled to be 42%;

[0119] The fourth time: the intermediate bar c is heated to 1025℃, and the holding time is equal to 0.55D (D is the diameter of the intermediate bar c), and then elongation is performed, and the deformation reduction rate during the elongation is equal to 40mm / s, to obtain intermediate bar d;

[0120] In the elongation process, the radial deformation amount is controlled to be 40%;

[0121] The fifth time: the intermediate bar d is heated to 1035℃, and the holding time is equal to 0.5D (D is the diameter of the intermediate bar d), and then elongation is performed, and the deformation reduction rate during the elongation is equal to 43mm / s, to obtain a finished round bar with uniform structure and excellent performance;

[0122] In the elongation process, the radial deformation amount is controlled to be 37%.

[0123] In another aspect, the embodiment provides a high-performance GH4169G high-temperature alloy round bar, which is prepared by the preparation method of the embodiment, and can maintain at least 35h without cracking or continuous cracking in an environment of 680℃ with a stress of 690MPa.

[0124] In still another aspect, the embodiments provide use of the high-performance GH4169G high-temperature alloy round bar as described above in preparation of an aviation part.

[0125] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application.

[0126] It is to be understood that the application is not limited to the embodiments described above, which can be modified in various ways without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

Claims

1. A method of producing high performance GH4169G high temperature alloy bar, characterized in that, The method comprises the following steps: Step 1, preparing a target ingot: selecting a GH4169G alloy ingot prepared by a set process, and sequentially performing homogenization treatment and machining treatment on the ingot to obtain a target ingot with a height-diameter ratio of 2.0-3.0; The homogenization treatment process of the GH4169G alloy ingot is as follows: cold charging the furnace and heating at a heating rate of 80-100 ℃ / h to 1100-1130 ℃, maintaining for 40-50 h, then heating at a heating rate of 2-5 ℃ / h to 1160-1190 ℃, maintaining for 80-100 h, and finally furnace cooling to 500-850 ℃ and air cooling to room temperature; Step 2, open-die forging: performing 4-6 fire times of radial-axial deformation treatment on the target ingot to obtain a rod blank; In the 4-6 fire times of radial-axial deformation treatment, the treatment mode and parameter range of each fire time are the same; In the radial-axial deformation treatment process of each fire time, the target ingot is heated to 1020-1080 ℃, and the holding time is 0.6-0.7 Dmin, then the deformation is performed by the way of upsetting first and then elongating, the deformation reduction rate in the deformation process is 30-80 mm / s, and an intermediate blank is obtained, and finally the intermediate blank is subjected to radial-axial deformation treatment of the next fire time; The D is the diameter of the rod before the current fire time forging, and in the first fire time of open-die forging, the diameter of the rod is the diameter of the target ingot, and the unit is mm; Step 3, finish forging: performing 3-5 fire times of radial deformation treatment on the rod blank to obtain a target rod; In the 3-5 fire times of radial deformation treatment, the treatment mode and parameter range of each fire time are the same; In the radial deformation treatment process of each fire time, the rod blank is heated to 1005-1040 ℃, and the holding time is 0.4-0.6 Dmin, then elongation is performed, the deformation reduction rate in the elongation process is 40-60 mm / s, and an intermediate rod is obtained, and finally the intermediate rod is subjected to radial deformation treatment of the next fire time; In the first fire time of finish forging, the D is the diameter of the rod blank, and the unit is mm.

2. The method of claim 1, wherein the high performance GH4169G superalloy bar is produced by the steps of: In step 1, the GH4169G alloy ingot is prepared by a VIM+ESR+VAR three-process smelting process. ​ 3. The method of claim 1, wherein the high performance GH4169G superalloy bar is produced by the steps of: In step 2, in the upsetting process, the axial deformation amount is 15-25%; and in the elongation process, the radial deformation amount is 20-25%. ​ 4. The method of claim 1, wherein the high performance GH4169G superalloy bar is produced by the steps of: In step 3, in the elongation process, the radial deformation amount is 25-45%. ​ 5. A high performance GH4169G superalloy bar, characterized in that, Prepared by the preparation method in any one of claims 1-4, it can maintain at least 35 h without cracking or continuous cracking under the stress of 690 MPa in the environment of 680 ℃.

6. Application of the high-performance GH4169G high-temperature alloy rod in claim 5 in preparing an aeronautical part.

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