阅读说明：本技术 一种gh4169合金热轧棒材的生产工艺 (Production process of GH4169 alloy hot-rolled bar ) 是由 张震 栾吉哲 李爱民 田水仙 刘猛 管庆阳 于 2021-04-09 设计创作，主要内容包括：本发明公开了一种再生利用GH4169合金热轧棒材的制备方法,包括以下步骤：A、使用开坯机将Φ160mm的GH4169合金轧钢坯料进行一次轧制开坯；B、使用开坯机对经过步骤A处理的钢坯进行二次轧制开坯；C、固溶退火；D、固溶后进行表面磨光处理；E、进行冷拔拔制。本发明能够改进现有技术的不足,提高了材料的强度性能。(The invention discloses a preparation method of a recycling GH4169 alloy hot-rolled bar, which comprises the following steps: A. carrying out primary rolling cogging on a GH4169 alloy steel rolling blank with the diameter of 160mm by using a cogging mill; B. b, using a cogging mill to perform secondary rolling cogging on the steel billet processed in the step A; C. solution treatment annealing; D. carrying out surface polishing treatment after solid solution; E. and (5) performing cold drawing. The invention can improve the defects of the prior art and improve the strength performance of the material.)

1. A production process of a GH4169 alloy hot rolled bar is characterized by comprising the following steps: and (3) carrying out hot rolling treatment on the blank by using a reversible rolling mill in a one-shot rolling mode, wherein the initial temperature of the hot rolling treatment is 1100 ℃, and the rolling time is 2 min 10 s to 2 min 20 s.

2. The process for the production of hot rolled bar of GH4169 alloy according to claim 1, characterized in that: the specification of the blank is phi 130 +/-10 mm x 600 mm.

3. The process for the production of hot rolled bar of GH4169 alloy according to claim 2, characterized in that: the finished product specification is phi 50mm, and the rolling pass is phi 130 mm- □ 119 mm- □ 116 mm- □ 109 mm- □ 105 mm- □ 98 mm- □ 93 mm- □ 87 mm- □ 82 mm- □ 77 mm- □ mm-3977 mm- □ 72 mm- □ 67 mm- □ 62 mm- □ 57 mm- □ 62 mm- □ 57 mm-ellipse-finished product.

4. The process for the production of hot rolled bar of GH4169 alloy according to claim 3, characterized in that: the surface temperature of the blank in the rolling process is more than or equal to 900 ℃.

5. The process for the production of hot rolled bar of GH4169 alloy according to claim 3, characterized in that: the surface temperature of the blank is more than or equal to 900 ℃ in the rolling process of the square blank, the surface temperature of the blank is reduced to 750-770 ℃ when the blank is rolled into an oval shape from the square shape, and the blank is heated again when the blank is rolled into a finished product from the oval shape, and the surface temperature of the blank is more than or equal to 900 ℃.

6. The process for the production of hot rolled bar of GH4169 alloy according to any of claims 1 to 5, wherein: the reversible rolling mill comprises a rack (1), wherein a plurality of lower rolls (2) are installed at the bottom of the rack (1), upper rolls (3) which are in one-to-one correspondence are installed above the lower rolls (2), two ends of each upper roll (3) are connected with the rack (1) through hydraulic cylinders (4), slide rails (5) which are in one-to-one correspondence with the upper rolls (3) are fixed on the rack (1), sliding plates (6) are connected on the slide rails (5) in a sliding and clamping mode, servo motors (7) are fixed on the sliding plates (6), spiral sleeves (7) which are in one-to-one correspondence with the slide rails (5) are fixed on the rack (1), threaded rods (8) are installed at the output ends of the servo motors (7), the threaded rods (8) are in threaded connection with the spiral sleeves (7), limiting blocks (9) are fixed on the servo motors (7), and limiting grooves (10) are installed on one sides, close to the corresponding limiting blocks (9), of the upper rolls (3); when the position of the upper roller (3) is adjusted, the servo motor (7) is started to enable the limiting block (9) to be separated from the limiting groove (10), then the hydraulic cylinder (4) is started to adjust the position of the upper roller (3), meanwhile, the servo motor (7) moves the limiting block (9) to an adjusting target position, and when the hydraulic cylinder (4) drives the limiting groove (10) to move to be completely matched with the limiting block (9) in an inserted mode, the position of the upper roller (3) is adjusted.

7. The process for the production of hot rolled bar of GH4169 alloy according to claim 6, characterized in that: the bottom of the limiting groove (10) is provided with an inclination angle sensor (11); the inclination angle sensor (11) monitors the levelness of the upper roller (3) in real time, and when the horizontal inclination angle of the upper roller (3) exceeds a threshold value, the unilateral hydraulic cylinder (4) is started to correct the horizontal inclination angle of the upper roller (3).

Technical Field

The invention relates to the technical field of alloy material preparation, in particular to a production process of a GH4169 alloy hot-rolled bar.

Background

The GH4169 alloy is a nickel-based wrought superalloy, and is widely applied to the fields of aerospace, power generation, petroleum, chemical engineering, ships and warships and the like due to excellent high-temperature mechanical property, fatigue resistance, corrosion resistance and welding property. The quality of the GH4169 alloy is greatly related to the microstructure, the refining of the microstructure can improve the strength, the fatigue performance and the like of the material, and the structure is uniformly distributed, so that the material integrally shows uniform material properties. Therefore, in order to obtain a GH4169 alloy material with excellent performance, the evolution of the alloy structure needs to be controlled. However, the GH4169 alloy structure and performance are extremely sensitive to the hot working process, and if the process and temperature are not well controlled, the phenomena of non-uniform structures such as mixed crystals, coarse crystals, surface elongated crystals and the like can occur.

Aiming at the problem, the prior art considers that the finishing temperature is more than or equal to 900 ℃, the final fire deformation is more than or equal to 30 percent, and the uniform refinement of the structure can be ensured. Therefore, in order to satisfy these two conditions, rolling is performed with a plurality of passes, and a deformation amount of about 30% is left in the last pass. However, this process is not suitable for bars with a set distance of phi 50-phi 65, and a surface coarse crystal layer usually appears, so that the uniform structure of the center, 1/2 radius and the edge cannot be ensured.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a production process of a GH4169 alloy hot-rolled bar, which can ensure the consistency of the structure and performance of a finished product and refine core grains.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows.

A production process of a GH4169 alloy hot rolled bar comprises the following steps: and (3) carrying out hot rolling treatment on the blank by using a reversible rolling mill in a one-shot rolling mode, wherein the initial temperature of the hot rolling treatment is 1100 ℃, and the rolling time is 2 min 10 s to 2 min 20 s.

Preferably, the billet gauge is 130mm + 10mm + 600 mm.

Preferably, the finished product specification is phi 50mm, and the rolling pass is phi 130 mm- □ 119 mm- □ 116 mm- □ 109 mm- □ 105 mm- □ 98 mm- □ 93 mm- □ 87 mm- □ 82 mm- □ 77 mm- □ mm-3977 mm- □ 72 mm- □ 67 mm- □ 62 mm- □ 57 mm- □ 62 mm- □ 57 mm-ellipse-finished product in sequence.

Preferably, the surface temperature of the blank is more than or equal to 900 ℃ in the rolling process.

Preferably, the surface temperature of the billet is more than or equal to 900 ℃ in the square rolling process of the billet, the surface temperature of the billet is reduced to 750-770 ℃ when the billet is rolled from the square into the oval, and the billet is heated again when the billet is rolled from the oval into a finished product, and the surface temperature of the billet is more than or equal to 900 ℃.

Preferably, the reversible rolling mill comprises a rack, a plurality of lower rolls are installed at the bottom of the rack, upper rolls which are in one-to-one correspondence are installed above the lower rolls, two ends of each upper roll are connected with the rack through hydraulic cylinders, slide rails which are in one-to-one correspondence with the upper rolls are fixed on the rack, slide plates are connected on the slide rails in a sliding and clamping manner, servo motors are fixed on the slide plates, spiral sleeves which are in one-to-one correspondence with the slide rails are fixed on the rack, threaded rods are installed at output ends of the servo motors, the threaded rods are in threaded connection with the spiral sleeves, limiting blocks are fixed on the servo motors, and limiting grooves are installed on one sides, close to the corresponding limiting blocks, of the upper rolls; when the position of the upper roller is adjusted, the servo motor is started firstly to enable the limiting block to be separated from the limiting groove, then the hydraulic cylinder is started to start adjusting the position of the upper roller, meanwhile, the servo motor moves the limiting block to an adjusting target position, and when the hydraulic cylinder drives the limiting groove to move to be completely matched with the limiting block in an inserted mode, the position of the upper roller is adjusted completely.

Preferably, the bottom of the limiting groove is provided with an inclination angle sensor; and the inclination angle sensor monitors the levelness of the upper roller in real time, and when the horizontal inclination angle of the upper roller exceeds a threshold value, a unilateral hydraulic cylinder is started to correct the horizontal inclination angle of the upper roller.

Adopt the beneficial effect that above-mentioned technical scheme brought to lie in: the invention adopts one-fire rolling, reduces the complexity of the working procedure, saves time and saves the finished product, can ensure the consistency of the structure performance of the finished product, and simultaneously refines the core crystal grains. The rolling process of the invention is from round to square to oval, and the surface crystal grains are controlled to be uniform by utilizing rapid continuous deformation. More importantly, the invention changes the inertial thinking that the surface temperature of the blank is more than or equal to 900 ℃ in the prior art, and the surface temperature of the blank is reduced to 750-770 ℃ for rolling when the blank is rolled into an oval shape from a square shape, and the uniformity of the grain size can be obviously improved. In addition, in order to match with the one-fire rolling process used by the invention, the invention optimizes the upper roller driving structure of the reversible rolling mill, overcomes the defect of poor adjustment precision of the hydraulic cylinder and improves the accuracy of the position adjustment of the upper roller.

Drawings

FIG. 1 is a graph of the grain size at the edge of the rolled bar of example 1.

FIG. 2 is a graph of the grain size at the edge of the rolled bar of example 2.

Fig. 3 is a structural view of the reversible rolling mill of the present invention.

FIG. 4 is a view showing the structure of a stopper groove of the present invention.

In the figure: 1. a frame; 2. a lower roll; 3. upper roll; 4. a hydraulic cylinder; 5. a slide rail; 6. a slide plate; 7. a servo motor; 8. a threaded rod; 9. a limiting block; 10. a limiting groove; 11. a tilt sensor; 12. a position sensor.

Detailed Description

Example 1

A production process of a GH4169 alloy hot rolled bar comprises the following steps: and (3) carrying out hot rolling treatment on the blank by using a reversible rolling mill in a one-shot rolling mode, wherein the initial temperature of the hot rolling treatment is 1100 ℃, and the rolling time is 2 min 10 s to 2 min 20 s. The specification of the blank is phi 130 +/-10 mm x 600 mm. The finished product specification is phi 50mm, and the rolling pass is phi 130 mm- □ 119 mm- □ 116 mm- □ 109 mm- □ 105 mm- □ 98 mm- □ 93 mm- □ 87 mm- □ 82 mm- □ 77 mm- □ mm-3977 mm- □ 72 mm- □ 67 mm- □ 62 mm- □ 57 mm- □ 62 mm- □ 57 mm-ellipse-finished product. The surface temperature of the blank in the rolling process is more than or equal to 900 ℃.

Example 2

A production process of a GH4169 alloy hot rolled bar comprises the following steps: and (3) carrying out hot rolling treatment on the blank by using a reversible rolling mill in a one-shot rolling mode, wherein the initial temperature of the hot rolling treatment is 1100 ℃, and the rolling time is 2 min 10 s to 2 min 20 s. The specification of the blank is phi 130 +/-10 mm x 600 mm. The finished product specification is phi 50mm, and the rolling pass is phi 130 mm- □ 119 mm- □ 116 mm- □ 109 mm- □ 105 mm- □ 98 mm- □ 93 mm- □ 87 mm- □ 82 mm- □ 77 mm- □ mm-3977 mm- □ 72 mm- □ 67 mm- □ 62 mm- □ 57 mm- □ 62 mm- □ 57 mm-ellipse-finished product. The surface temperature of the blank is more than or equal to 900 ℃ in the rolling process of the square blank, the surface temperature of the blank is reduced to 750-770 ℃ when the blank is rolled into an oval shape from the square shape, and the blank is heated again when the blank is rolled into a finished product from the oval shape, and the surface temperature of the blank is more than or equal to 900 ℃.

As can be seen from the comparison between fig. 1 and fig. 2, the grain size uniformity after optimization in example 2 is better.

Referring to fig. 3 and 4, the reversible rolling mill comprises a frame 1, wherein a plurality of lower rolls 2 are installed at the bottom of the frame 1, upper rolls 3 which are in one-to-one correspondence are installed above the lower rolls 2, two ends of the upper rolls 3 are connected with the frame 1 through hydraulic cylinders 4, slide rails 5 which are in one-to-one correspondence with the upper rolls 3 are fixed on the frame 1, slide plates 6 are slidably clamped on the slide rails 5, servo motors 7 are fixed on the slide plates 6, spiral sleeves 7 which are in one-to-one correspondence with the slide rails 5 are fixed on the frame 1, threaded rods 8 are installed at the output ends of the servo motors 7, the threaded rods 8 are in threaded connection with the spiral sleeves 7, limiting blocks 9 are fixed on the servo motors 7, and limiting grooves 10 are installed at one sides, close to the limiting blocks 9, of the upper rolls 3; when the position of the upper roller 3 is adjusted, the servo motor 7 is started firstly to separate the limiting block 9 from the limiting groove 10, then the hydraulic cylinder 4 is started to adjust the position of the upper roller 3, meanwhile, the servo motor 7 moves the limiting block 9 to an adjustment target position, and when the hydraulic cylinder 4 drives the limiting groove 10 to move to be completely matched with the limiting block 9 in an inserted mode, the position of the upper roller 3 is adjusted. The bottom of the limiting groove 10 is provided with an inclination angle sensor 11; the inclination angle sensor 11 monitors the levelness of the upper roller 3 in real time, and when the horizontal inclination angle of the upper roller 3 exceeds a threshold value, the unilateral hydraulic cylinder 4 is started to correct the horizontal inclination angle of the upper roller 3.

Two position sensors 12 are installed on the side wall of the limiting groove 10, the position sensors 12 are used for detecting the relative positions of the limiting block 9 and the limiting groove 10, when the relative positions of the limiting block 9 and the limiting groove 10 change, the limiting block 9 and the limiting groove 10 are detected, worn parts are replaced, and therefore the accurate limiting of the position of the upper roller 3 is guaranteed.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.