Heat treatment process for eliminating coarse grains of GH4099 alloy hot-rolled bar strip

Abstract

The invention discloses a heat treatment process for eliminating coarse grains of a GH4099 alloy hot-rolled bar strip. The heat treatment process comprises a rolling stage, a solid solution stage and an aging stage, the rolled alloy is heated to 1130-1140 DEG C, heat preservation is conducted for 5-10 min, and the alloy is discharged out of the furnace and subjected to water cooling to the room temperature; in the second solid solution stage, the temperature of the alloy treated in the first solid solution stage is increased to 1060-1100 DEG C, heat preservation is conducted for 1-3 h, and the alloy is discharged out of the furnace and water-cooled to the room temperature; and in the aging stage, the alloy treated in the second solid solution stage is heated to 880-920 DEG C, heat preservation is conducted for 4-6 h, and then the alloy is discharged out of the furnace and air-cooled to the room temperature. Through the hot rolling technology, the high-temperature short-time pre-solid solution technology, the conventional solid solution technology and the one-time aging technology, the grain boundary pinning phase is re-dissolved, strip coarse grains are prevented from appearing on the longitudinal section of an alloy bar, it is ensured that the alloy grain structure is uniform, the average grain size is 4.8-5.2 level, and meanwhile the high-temperature durability stability of the alloy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-temperature alloy production, and more particularly to a heat treatment process for eliminating strip coarse grains of GH4099 alloy hot-rolled bars. BACKGROUND

[0002] GH4099 high-temperature nickel-based alloy is widely used in aerospace, nuclear power and energy fields due to its excellent microstructure stability, good cold and hot working forming and welding performance. The alloy rolled bar is mainly used for manufacturing aircraft engine compressor blades. GH4099 alloy is an age-hardened nickel-based wrought high-temperature alloy strengthened by γ'. It is based on Ni and Cr, solid solution strengthened by W, Mo and Co, and aged strengthened by Al and Ti, and grain boundary strengthened by B, Ce and Mg. The precipitated phases in GH4099 alloy mainly include γ' phase, MC carbide, M 23 C6 carbide, which can hinder dislocation movement and pin grain boundary migration, thereby improving the deformation resistance of the alloy. In addition, since the grain growth is hindered by the precipitated phase pinning grain boundary, the size, morphology and distribution of the precipitated phase greatly affect the grain growth behavior of the nickel-based high-temperature alloy.

[0003] If the process is not properly controlled during the manufacturing and hot working process of the nickel-based high-temperature alloy, abnormal grain growth may occur, causing the material grain rating to be out of standard, and even seriously affecting the service performance of the material. The GH4099 alloy hot-rolled bar has internal strip coarse grains after conventional heat treatment, which seriously affects its high-temperature endurance performance.

[0004] Therefore, there is an urgent need to provide a heat treatment process for eliminating strip coarse grains of GH4099 alloy hot-rolled bars. SUMMARY

[0005] The present application aims to overcome the above-mentioned defects existing in the prior art, and provides a heat treatment process for eliminating strip coarse grains of GH4099 alloy hot-rolled bars. The present application avoids the occurrence of strip coarse grains in the longitudinal section of the alloy bar by increasing high-temperature short-time pre-solution, ensures that the average grain size of the alloy is controlled within 4.5, and at the same time improves the high-temperature endurance performance stability of the alloy.

[0006] To achieve the above-mentioned purpose, the technical solution of the present application is as follows: A heat treatment process for eliminating coarse grains of GH4099 alloy hot-rolled bar strips, the heat treatment process comprising rolling, solution and aging stages; wherein the solution comprises a solution first stage and a solution second stage; the solution first stage: high-temperature short-time pre-solution treatment, heating the alloy after rolling to 1130-1140 DEG C, holding for 5-10 min, water cooling to room temperature after discharging; the solution second stage: heating the alloy after the solution first stage to 1060-1100 DEG C, holding for 1-3 h, water cooling to room temperature after discharging; the aging stage: heating the alloy after the solution second stage to 880-920 DEG C, holding for 4-6 h, then air cooling to room temperature after discharging.

[0007] Optionally, the solution first stage: heating the alloy after rolling to 1130-1140 DEG C, holding for 5-10 min, water cooling to room temperature after discharging; the solution second stage: heating the alloy after the solution first stage to 1080 DEG C, holding for 2 h, water cooling to room temperature after discharging; the aging stage: heating the alloy after the solution second stage to 900 DEG C, holding for 5 h, then air cooling to room temperature after discharging.

[0008] Optionally, the rolling: the bar rolling temperature is 1150-1155 DEG C, holding for 60-70 min, the rolling deformation is 80-82%, the rolling speed is 1.4-1.6 m / s, the opening rolling temperature is 1080-1090 DEG C, and the finish rolling temperature is 960-980 DEG C.

[0009] Optionally, the holding time in the solution first stage, the solution second stage and the aging stage is the heating time after the alloy is fully heat penetrated.

[0010] Optionally, the GH4099 alloy hot-rolled bar comprises the following components in mass percentage: C≤0.08%, Mn≤0.4%, Si≤0.5%, P≤0.015%, S≤0.015%, Cr: 17.0-20.0%, W: 5.0-7.0%, Mo: 3.5-5.0%, Co: 5.0-8.0%, Al: 1.6-2.3%, Ti: 1.1-1.6%, Fe: 1.0-5.0%, B≤0.005%, Ce≤0.02%, Nb≤0.10%, and the balance is Ni.

[0011] Optionally, the average grain size of the alloy after the heat treatment process is 4.8-5.2 levels.

[0012] Implementing the embodiment of the present application has the following beneficial effects: The application promotes the recrystallization of grain boundary carbide and the normal growth of grains by adding high-temperature short-time pre-solution treatment as the first stage of solution treatment before the solution treatment of the high-temperature alloy, then performing the second stage of solution treatment, and controlling the treatment temperature and holding time to ensure that the alloying elements are fully dissolved in the matrix to form a uniform supersaturated solid solution, which can ensure the solution effect of the alloy and avoid the appearance of strip coarse grains in the longitudinal direction of the alloy bar, and ensure that the average grain size of the alloy is 4.8-5.2 and the high-temperature durability stability of the alloy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the longitudinal section metallographic structure of the comparative example 1 of the application.

[0014] Figure 2 is the longitudinal section metallographic structure of the example 1 of the application.

[0015] Figure 3 is the longitudinal section metallographic structure of the example 2 of the application.

[0016] Figure 4 is the longitudinal section metallographic structure of the comparative example 2 of the application.

[0017] Figure 5 is the longitudinal section metallographic structure of the comparative example 3 of the application.

[0018] Figure 6 is the longitudinal section metallographic structure of the comparative example 4 of the application.

[0019] Figure 7 is the longitudinal section metallographic structure of the comparative example 5 of the application.

[0020] Figure 8 is the longitudinal section metallographic structure of the comparative example 6 of the application. DETAILED DESCRIPTION

[0021] The application will be further described below in combination with specific examples, but the application is not limited in any way by the examples.

[0022] Comparative example 1: The comparative example is aimed at a hot-rolled Φ18mm GH4099 bar; the Φ18mm GH4099 hot-rolled bar comprises the following components in mass percentage: C: 0.04%, Mn: 0.2%, Si: 0.25%, P: 0.01%, S: 0.01%, Cr: 18.5%, W: 6.0%, Mo: 4.25%, Co: 6.5%, Al: 1.95%, Ti: 1.35%, Fe: 1.0%, B: 0.005%, Ce: 0.001%, Nb: 0.10%, and the balance is Ni.

[0023] The heat treatment process and characterization of the comparative example comprise the following steps: First step, rolling: the rolling heating temperature of the bar is 1152℃, the holding time is 65min, the rolling deformation is 81%, the rolling speed is 1.5m / s, the starting rolling temperature is 1085℃, and the final rolling temperature is 970℃.

[0024] Second step, solid solution stage: the alloy is heated to 1080℃, and held for 2h, and then water-cooled to room temperature.

[0025] Third step, aging stage: after the solid solution stage, the alloy is heated to 900℃, and held for 5h, and then air-cooled to room temperature.

[0026] Fourth step, the microstructure of the longitudinal section of the GH4099 hot-rolled bar after the standard heat treatment is shown in FIG. 1. Figure 1

[0027] Fifth step, sample at 1 / 2 radius, the GH4099 hot-rolled bar in the comparative example 1 is prepared into a stress-rupture sample, and the stress-rupture performance test at 900℃ / 98MPa is carried out according to GB / T 2039 "Metal Tensile Creep and Stress-rupture Test Method", and the test results are shown in Table 1.

[0028] Example 1 The heat treatment process provided in the example can eliminate the coarse grain of the GH4099 hot-rolled bar, and is used for Φ18mm GH4099 bar produced by hot rolling. The Φ18mm GH4099 hot-rolled bar comprises the following components in percentage by mass: C: 0.04%, Mn: 0.2%, Si: 0.25%, P: 0.01%, S: 0.01%, Cr: 18.5%, W: 6.0%, Mo: 4.25%, Co: 6.5%, Al: 1.95%, Ti: 1.35%, Fe: 1.0%, B: 0.005%, Ce: 0.001%, Nb: 0.10%, and the balance is Ni.

[0029] The heat treatment process and characterization of the example comprise the following steps: Rolling: the rolling heating temperature of the bar is 1152℃, the holding time is 65min, the rolling deformation is 81%, the rolling speed is 1.5m / s, the starting rolling temperature is 1085℃, and the final rolling temperature is 970℃.

[0030] Second step, first solid solution stage: high-temperature short-time pre-solid solution treatment: the alloy is heated to 1130℃, and held for 10min, and then water-cooled to room temperature.

[0031] Third step, second solid solution stage: after the first high-temperature short-time pre-solid solution treatment, the alloy is heated to 1080℃, and held for 2h, and then water-cooled to room temperature.

[0032] ​Fourth step, aging stage: after the solution stage, the alloy is heated to 900℃, and kept for 5h, and then air-cooled to room temperature after furnace discharge.

[0033] Fifth step, the microstructure of the cross section and longitudinal section of GH4099 hot-rolled bar after the high-temperature short-time solution heat treatment is characterized, as shown in Figure 2 , respectively, and the average grain size is measured.

[0034] Example 2: The heat treatment process provided in this embodiment eliminates the coarse grain of GH4099 hot-rolled bar strip. The Φ18mm GH4099 bar produced by hot rolling includes the following components by mass percentage: C: 0.04%, Mn: 0.2%, Si: 0.25%, P: 0.01%, S: 0.01%, Cr: 18.5%, W: 6.0%, Mo: 4.25%, Co: 6.5%, Al: 1.95%, Ti: 1.35%, Fe: 1.0%, B: 0.005%, Ce: 0.001%, Nb: 0.10%, and the balance of Ni.

[0035] The heat treatment process and characterization of this embodiment include the following steps: First step, rolling: the rolling heating temperature of the bar is 1152℃, the holding time is 65min, the rolling deformation is 81%, the rolling speed is 1.5m / s, the opening rolling temperature is 1085℃, and the final rolling temperature is 970℃.

[0036] Second step, first solution stage: high-temperature short-time pre-solution treatment: the alloy is heated to 1140℃, kept for 10min, and water-cooled to room temperature after furnace discharge; Third step, second solution stage: after the first stage of high-temperature short-time pre-solution treatment, the alloy is heated to 1080℃, kept for 2h, and water-cooled to room temperature after furnace discharge; Fourth step, aging stage: after the solution stage, the alloy is heated to 900℃, and kept for 5h, and then air-cooled to room temperature after furnace discharge. Fifth step, the microstructure of the longitudinal section is characterized, as shown in Figure 3 , and the average grain size is measured.

[0037] Comparative Example 2: The comparative example provides a heat treatment process for eliminating coarse grains of GH4099 alloy hot-rolled rod strips. The Φ18mm GH4099 rod is produced by hot rolling. The Φ18mm GH4099 hot-rolled rod comprises the following components by mass percentage: C: 0.04%, Mn: 0.2%, Si: 0.25%, P: 0.01%, S: 0.01%, Cr: 18.5%, W: 6.0%, Mo: 4.25%, Co: 6.5%, Al: 1.95%, Ti: 1.35%, Fe: 1.0%, B: 0.005%, Ce: 0.001%, Nb: 0.10%, and the balance of Ni.

[0038] The heat treatment process and characterization of the comparative example include the following steps: First step, rolling: the rod rolling heating temperature is 1152℃, the holding time is 65min, the rolling deformation is 81%, the rolling speed is 1.5m / s, the opening rolling temperature is 1085℃, and the final rolling temperature is 970℃.

[0039] Second step, first stage of solid solution: high temperature short time pre-solid solution treatment: the alloy is heated to 1150℃, the holding time is 10min, and the furnace is water cooled to room temperature; Third step, second stage of solid solution: after the first stage of high temperature short time pre-solid solution treatment is completed, the alloy is heated to 1080℃, the holding time is 2h, and the furnace is water cooled to room temperature; Fourth step, aging stage: after the solid solution stage is completed, the alloy is heated to 900℃, the holding time is 5h, and then the furnace is air cooled to room temperature; Fifth step, the metallographic structure of the longitudinal section is characterized as shown in Figure 4 respectively, and the average grain size is measured.

[0040] Comparative example 3: The comparative example provides a heat treatment process for eliminating coarse grains of GH4099 alloy hot-rolled rod strips. The Φ18mm GH4099 rod is produced by hot rolling. The Φ18mm GH4099 hot-rolled rod comprises the following components by mass percentage: C: 0.04%, Mn: 0.2%, Si: 0.25%, P: 0.01%, S: 0.01%, Cr: 18.5%, W: 6.0%, Mo: 4.25%, Co: 6.5%, Al: 1.95%, Ti: 1.35%, Fe: 1.0%, B: 0.005%, Ce: 0.001%, Nb: 0.10%, and the balance of Ni.

[0041] The heat treatment process and characterization of the comparative example include the following steps: First step, rolling: the bar rolling heating temperature is 1152℃, the holding time is 65min, the rolling deformation is 81%, the rolling speed is 1.5m / s, the starting rolling temperature is 1085℃, and the final rolling temperature is 970℃.

[0042] Second step, first stage of solution: high-temperature short-time pre-solution treatment: the alloy is heated to 1130℃, the holding time is 15min, and the alloy is water cooled to room temperature after discharging; Third step, second stage of solution: after the first stage of high-temperature short-time pre-solution treatment is completed, the alloy is heated to 1080℃, the holding time is 2h, and the alloy is water cooled to room temperature after discharging; Fourth step, aging stage: after the solution stage is completed, the alloy is heated to 900℃, the holding time is 5h, and then the alloy is air cooled to room temperature after discharging; Fifth step, the metallographic structure of the longitudinal section is shown in Figure 5 , and the average grain size thereof is measured.

[0043] Comparative Example 4: The heat treatment process provided in the present comparative example eliminates the coarse grains of the hot-rolled bar strip of GH4099 alloy, and is used for Φ18mm GH4099 bar produced by hot rolling. The Φ18mm GH4099 hot-rolled bar comprises the following components in percentage by mass: C: 0.04%, Mn: 0.2%, Si: 0.25%, P: 0.01%, S: 0.01%, Cr: 18.5%, W: 6.0%, Mo: 4.25%, Co: 6.5%, Al: 1.95%, Ti: 1.35%, Fe: 1.0%, B: 0.005%, Ce: 0.001%, Nb: 0.10%, and the balance is Ni.

[0044] The heat treatment process and characterization of the present comparative example comprise the following steps: First step, rolling: the bar rolling heating temperature is 1152℃, the holding time is 65min, the rolling deformation is 81%, the rolling speed is 1.5m / s, the starting rolling temperature is 1085℃, and the final rolling temperature is 970℃.

[0045] Second step, first stage of solution: high-temperature short-time pre-solution treatment: the alloy is heated to 1130℃, the holding time is 20min, and the alloy is water cooled to room temperature after discharging; Third step, second stage of solution: after the first stage of high-temperature short-time pre-solution treatment is completed, the alloy is heated to 1080℃, the holding time is 2h, and the alloy is water cooled to room temperature after discharging; Fourth step, aging stage: after the solution stage is completed, the alloy is heated to 900℃, the holding time is 5h, and then the alloy is air cooled to room temperature after discharging; Fifth step, the metallographic structure of the longitudinal section is shown in Figure 6 , and the average grain size thereof is measured.

[0046] Comparative Example 5: The heat treatment process provided by the present comparative example for eliminating coarse grains of GH4099 alloy hot-rolled bar strip is aimed at Φ18mm GH4099 bar produced by hot rolling. The Φ18mm GH4099 hot-rolled bar includes the following components by mass percentage: C: 0.04%, Mn: 0.2%, Si: 0.25%, P: 0.01%, S: 0.01%, Cr: 18.5%, W: 6.0%, Mo: 4.25%, Co: 6.5%, Al: 1.95%, Ti: 1.35%, Fe: 1.0%, B: 0.005%, Ce: 0.001%, Nb: 0.10%, and the balance is Ni.

[0047] The heat treatment process and characterization of the present comparative example include the following steps: First step, rolling: the bar rolling heating temperature is 1152℃, the holding time is 65min, the rolling deformation is 81%, the rolling speed is 1.5m / s, the opening rolling temperature is 1085℃, and the final rolling temperature is 970℃.

[0048] Second step, first stage of solid solution: high-temperature short-time pre-solid solution treatment: the alloy is heated to 1140℃, held for 15min, and water cooled to room temperature after discharging; Third step, second stage of solid solution: after the first stage of high-temperature short-time pre-solid solution treatment is completed, the alloy is heated to 1080℃, held for 2h, and water cooled to room temperature after discharging; Fourth step, aging stage: after the solid solution stage is completed, the alloy is heated to 900℃, held for 5h, and then air cooled to room temperature after discharging; Fifth step, characterization of the metallographic structure of the longitudinal section, as shown in Figure 7 , and the average grain size is measured.

[0049] Comparative Example 6: The heat treatment process provided by the present comparative example for eliminating coarse grains of GH4099 alloy hot-rolled bar strip is aimed at Φ18mm GH4099 bar produced by hot rolling. The Φ18mm GH4099 hot-rolled bar includes the following components by mass percentage: C: 0.04%, Mn: 0.2%, Si: 0.25%, P: 0.01%, S: 0.01%, Cr: 18.5%, W: 6.0%, Mo: 4.25%, Co: 6.5%, Al: 1.95%, Ti: 1.35%, Fe: 1.0%, B: 0.005%, Ce: 0.001%, Nb: 0.10%, and the balance is Ni.

[0050] The heat treatment process and characterization of the present comparative example include the following steps: First step, rolling: the heating temperature of the bar rolling is 1152℃, the holding time is 65min, the rolling deformation is 81%, the rolling speed is 1.5m / s, the starting rolling temperature is 1085℃, and the final rolling temperature is 970℃.

[0051] Second step, first stage of solution: high-temperature short-time pre-solution treatment: the alloy is heated to 1140℃, held for 20min, and water cooled to room temperature after discharging; Third step, second stage of solution: after the first stage of high-temperature short-time pre-solution treatment is completed, the alloy is heated to 1080℃, held for 2h, and water cooled to room temperature after discharging; Fourth step, aging stage: after the solution stage is completed, the alloy is heated to 900℃, held for 5h, and then air cooled to room temperature after discharging; Fifth step, the metallographic structure of the longitudinal section is characterized, as shown in Figure 8 respectively, and the average grain size is measured.

[0052] In the above examples and comparative examples, the holding time in each step is the heating time after the alloy is fully heat penetrated.

[0053] Comparative Figure 1 and Figure 2 The hot-rolled bar longitudinal section metallographic structure of Example 1 is found to have uniform cross-sectional grain structure after the heat treatment process for eliminating the coarse grains of the GH4099 alloy hot-rolled bar strip. According to the high-temperature durability performance data in Table 1, the performance of Example 1 is better than that of Comparative Example 1, and meets the standard requirements (> 50h).

[0054] After the heat treatment process for eliminating the coarse grains of the GH4099 alloy hot-rolled bar strip of Example 1, the grain size is measured according to GB / T 6394 “Metal Average Grain Size Determination Method”, and the average grain size rating is 5.2, which is finer than 4.5, meeting the standard requirements.

[0055] After the heat treatment process for eliminating the coarse grains of the GH4099 alloy hot-rolled bar strip of Example 2, the grain size is measured according to GB / T 6394 “Metal Average Grain Size Determination Method”, and the average grain size rating is 4.8, which is finer than 4.5, meeting the standard requirements.

[0056] After the heat treatment process for eliminating the coarse grains of the GH4099 alloy hot-rolled bar strip of Comparative Example 2, the grain size is measured according to GB / T 6394 “Metal Average Grain Size Determination Method”, and the average grain size rating is 3.2.

[0057] The average grain size of the hot-rolled bar of Comparative Example 3 after the heat treatment process for eliminating coarse grains of the GH4099 alloy was measured according to GB / T 6394 "Metallic Materials - Determination of Average Grain Size", and the average grain size rating was 4.17.

[0058] The average grain size of the hot-rolled bar of Comparative Example 4 after the heat treatment process for eliminating coarse grains of the GH4099 alloy was measured according to GB / T 6394 "Metallic Materials - Determination of Average Grain Size", and the average grain size rating was 4.0.

[0059] The average grain size of the hot-rolled bar of Comparative Example 5 after the heat treatment process for eliminating coarse grains of the GH4099 alloy was measured according to GB / T 6394 "Metallic Materials - Determination of Average Grain Size", and the average grain size rating was 4.02.

[0060] The average grain size of the hot-rolled bar of Comparative Example 6 after the heat treatment process for eliminating coarse grains of the GH4099 alloy was measured according to GB / T 6394 "Metallic Materials - Determination of Average Grain Size", and the average grain size rating was 3.8.

[0061] Comparative Example 2 Figure 3 and Figures 4-8 The longitudinal section metallographic structure of the hot-rolled bar of Comparative Example 2-6, the grain structure of Example 2 is obviously finer, the temperature of high-temperature pre-solutionizing cannot be too high and the time cannot be too long, the grain boundary pinning phase is basically completely dissolved at 1150℃, and the grain rapidly grows.

[0062] Comparative Example 7 This comparative example is compared with Example 1, the only difference is that the first stage of solutionizing: high-temperature short-time pre-solutionizing treatment: the alloy is heated to 1120℃, and held for 10min, and water-cooled to room temperature after discharging.

[0063] Comparative Example 8 This comparative example is compared with Example 1, the only difference is that the first stage of solutionizing: high-temperature short-time pre-solutionizing treatment: the alloy is heated to 1120℃, and held for 15min, and water-cooled to room temperature after discharging.

[0064] Comparative Example 9 This comparative example is compared with Example 1, the only difference is that the first stage of solutionizing: high-temperature short-time pre-solutionizing treatment: the alloy is heated to 1150℃, and held for 5min, and water-cooled to room temperature after discharging.

[0065] Comparative Example 10 This comparative example is compared with Example 1, the only difference is that the first stage of solutionizing: high-temperature short-time pre-solutionizing treatment: the alloy is heated to 1140℃, and held for 3min, and water-cooled to room temperature after discharging.

[0066] Comparative Example 11 The comparative example is compared with example 1, and the only difference is that the first stage of solid solution is high-temperature short-time pre-solid solution treatment: the alloy is heated to 1130 DEG C, kept for 3 min, and water-cooled to room temperature after discharging.

[0067] The samples of example 1, comparative example 1 and comparative examples 7-11 are taken at 1 / 2 radius, the rod in example 1, comparative example 1 and comparative examples 7-11 is prepared into a lasting sample, and the lasting performance test at 900 DEG C / 98 MPa is carried out by using GB / T 2039 "Metal Tensile Creep and Lasting Test Method", and the test result is shown in table 1.

[0068] Table 1, comparative example 1, comparative example 7-11 and the high-temperature lasting performance of GH4099 hot-rolled rod in example 1

[0069] In conclusion, the heat treatment process can effectively eliminate the strip coarse grain structure, obtain uniform grain structure, and improve the high-temperature lasting performance, and the grain size and the lasting performance meet the standard requirements.

[0070] The above-described examples only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A heat treatment process to eliminate coarse grain heat-rolled bar strip of GH4099 alloy, characterized in that, The heat treatment process comprises rolling, solution and aging stages; wherein the solution comprises a solution first stage and a solution second stage; The solution first stage: the alloy after rolling is heated to 1130-1140℃, and held for 5-10min, and water cooled to room temperature after discharging; The solution second stage: the alloy after the solution first stage is heated to 1060-1100℃, and held for 1-3h, and water cooled to room temperature after discharging; The aging stage: the alloy after the solution second stage is heated to 880-920℃, and held for 4-6h, and then air cooled to room temperature after discharging.

2. The heat treatment process to eliminate coarse grain heat rolled bar strip of GH4099 alloy of claim 1, wherein, The solution first stage: the alloy after rolling is heated to 1130-1140℃, and held for 5-10min, and water cooled to room temperature after discharging; The solution second stage: the alloy after the solution first stage is heated to 1080℃, and held for 2h, and water cooled to room temperature after discharging; The aging stage: the alloy after the solution second stage is heated to 900℃, and held for 5h, and then air cooled to room temperature after discharging.

3. The heat treatment process to eliminate coarse grain heat rolled bar strip of GH4099 alloy of claim 1, wherein, The rolling: the bar rolling temperature is 1150-1155℃, the holding time is 60-70min, the rolling deformation is 80-82%, the rolling speed is 1.4-1.6m / s, the open rolling temperature is 1080-1090℃, and the finish rolling temperature is 960-980℃.

4. The heat treatment process to eliminate coarse grain heat rolled bar strip of GH4099 alloy of claim 1, wherein, The holding time in the solution first stage, the solution second stage and the aging stage is the heating time after the alloy is fully heat penetrated.

5. The heat treatment process to eliminate coarse grain heat rolled bar strip of GH4099 alloy of claim 1, wherein, The GH4099 alloy hot rolling bar comprises the following components in mass percentage: C≤0.08%, Mn≤0.4%, Si≤0.5%, P≤0.015%, S≤0.015%, Cr: 17.0-20.0%, W: 5.0-7.0%, Mo: 3.5-5.0%, Co: 5.0-8.0%, Al: 1.6-2.3%, Ti: 1.1-1.6%, Fe: 1.0-5.0%, B≤0.005%, Ce≤0.02%, Nb≤0.10%, and the balance is Ni.

6. The heat treatment process to eliminate coarse grain heat rolled bar strip of GH4099 alloy of claim 1, wherein, The average grain size of the alloy after the heat treatment process is 4.8-5.2.

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