CN109604926B - Steel blank construction interface healing method - Google Patents
Steel blank construction interface healing method Download PDFInfo
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- CN109604926B CN109604926B CN201811350464.XA CN201811350464A CN109604926B CN 109604926 B CN109604926 B CN 109604926B CN 201811350464 A CN201811350464 A CN 201811350464A CN 109604926 B CN109604926 B CN 109604926B
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Abstract
The invention provides a steel billet building interface healing method. The method comprises the following steps: the method comprises the following steps: heating the sealed and welded steel blank, and enabling a construction interface to be positioned in the horizontal direction; step two: upsetting by using a flat anvil and avoiding staggered anvils, wherein the upsetting mode is as follows: firstly, adopting one-time quick pressing, and then carrying out pressure maintaining; step three: returning, performing diffusion connection by heating, and keeping the temperature after temperature equalization; step four: forging and controlling the total deformation. The steel billet construction method provided by the invention effectively solves the problem of healing of a steel billet construction interface by combining a special upsetting mode and heating diffusion connection, and obviously improves the yield of subsequent construction molding.
Description
Technical Field
The invention belongs to the field of material processing, and particularly relates to a steel billet construction interface healing method.
Background
The building and forming technology is a newly developed technology. In the process of constructing and forming the steel blanks, the steel blanks are connected together by sealing welding, but a large number of interstitial interfaces exist inside the steel blanks, the interstitial interfaces can be regarded as internal defects in the subsequent forging process, and the healing of the internal defects can be realized only by multi-directional forging with large deformation. However, the large deformation forging is likely to cause forging cracks in the steel blank, and the steel blank is likely to crack, thereby causing failure in the construction and forming.
Disclosure of Invention
In order to solve the problems in the existing steel billet construction and forming, the invention provides a steel billet construction interface healing method. The method comprises the following steps:
the method comprises the following steps: heating the sealed and welded steel blank, and enabling a construction interface to be positioned in the horizontal direction;
step two: upsetting by using a flat anvil and avoiding staggered anvils, wherein the upsetting mode is as follows: firstly, one-time rapid pressing is adopted, the pressing deformation is more than 30%, and the pressing time is less than 2 minutes; then, maintaining the pressure for more than 20 minutes, wherein the deformation in the pressure maintaining process is controlled to be 10-25%;
step three: returning, performing diffusion connection by heating, and keeping the temperature for more than 12 hours after temperature equalization;
step four: forging to make the total deformation not less than 20% and finally to reach the required size.
According to one embodiment, the following operations may also be performed 1-2 times between the third step and the fourth step: pressing for more than 20 minutes, returning to the furnace, performing diffusion bonding by heating, and keeping the temperature for more than 12 hours after temperature equalization; the sum of the total deformation of the pressing in the operation 1-2 times and the deformation in the pressure maintaining process in the step two is controlled to be 10-25%; meanwhile, the deformation amount in the pressure maintaining process in the second step may be less than 10%.
According to one embodiment, when the outer shape of the steel blank is hourglass-shaped, the upsetting mode can be replaced by the following mode: firstly, one-time rapid pressing is adopted, the pressing deformation is more than 15%, and the pressing time is less than 2 minutes; and then, maintaining the pressure for more than 20 minutes, wherein the deformation in the pressure maintaining process is controlled to be 5-20%.
According to one embodiment, the steel blank may be a stainless steel blank or a carbon steel blank.
Further, the steel blank may have a rectangular parallelepiped, a cube, or a cylinder shape.
The steel billet construction method provided by the invention effectively solves the problem of healing of a steel billet construction interface by combining a special upsetting mode and heating diffusion connection, and obviously improves the yield of subsequent construction molding.
Drawings
FIG. 1 is a schematic view of an upsetting method according to an embodiment of the present invention.
FIG. 2 is an electron microscope image of a steel building interface that has not been treated by the method of healing a steel building interface according to the present invention.
FIG. 3 is a micrograph of a steel build interface that has not been treated by the steel build interface healing method of the present invention.
FIG. 4 is an electron microscope image of a steel building interface treated by the method for healing a steel building interface according to the present invention.
Reference numerals: 1. sealing the welded steel blank, 2, an upper flat anvil and 3, a lower flat anvil.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details.
Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of embodiments of the invention and should not be construed as limiting the invention.
The steel blank construction interface healing method comprises the following steps:
the method comprises the following steps: heating the sealed and welded steel blank, and enabling a construction interface to be positioned in the horizontal direction;
step two: upsetting by using a flat anvil and avoiding staggered anvils, wherein the upsetting mode is as follows: firstly, one-time rapid pressing is adopted, the pressing deformation is more than 30%, and the pressing time is less than 2 minutes; then, maintaining the pressure for more than 20 minutes, wherein the deformation in the pressure maintaining process is controlled to be 10-25%;
step three: returning, performing diffusion connection by heating, and keeping the temperature for more than 12 hours after temperature equalization;
step four: forging to make the total deformation not less than 20% and finally to reach the required size.
As shown in fig. 2-3, a distinct interface exists between the steel blanks prior to treatment without the steel blank interface construction healing process of the present invention. Then, the steel billet construction interface healing method is adopted for treatment, along with the alternate action of one-time rapid large-deformation pressing-pressure maintaining-heating diffusion connection, the interface gradually disappears, the oxide particles at the interface are gradually reduced, and the interface bonding strength is continuously improved; at the same time, recrystallization occurs due to the occurrence of large deformation. When the total deformation amount approaches 50%, as shown in fig. 4, the interface disappears completely, the recrystallization degree is sufficient, and the bonding strength is significantly improved.
The key point of the invention is the adoption of the upsetting mode and the heating diffusion bonding. Researches show that the alternate action of one-time large-deformation rapid pressing-pressure maintaining-heating diffusion connection and the synergistic action of all parameters can promote the effective healing of a steel blank construction interface on the premise of ensuring that the steel blank does not crack.
Because a large number of gaps and interfaces exist in the middle of the steel blank, the dislocation of the anvil can cause the buckling and cracking of the far end, and the dislocation of the anvil is strictly avoided in the upsetting process before the interfaces are completely healed.
And step five, forging to ensure that the total deformation amount of each direction is not less than 20%, so that internal homogenization is facilitated, and the cracking risk is further reduced.
According to an example, the following operations can be performed 1-2 times between the third step and the fourth step: pressing for more than 20 minutes, returning to the furnace, performing diffusion bonding by heating, and keeping the temperature for more than 12 hours after temperature equalization; the sum of the total deformation of the pressing in the operation 1-2 times and the deformation in the pressure maintaining process in the step two is controlled to be 10-25%; meanwhile, the deformation amount in the pressure maintaining process in the step two can be less than 10%, and the construction interface healing can be better promoted.
According to one example, when the outer shape of the steel blank is hourglass-shaped, the upsetting means can also be replaced by: firstly, one-time rapid pressing is adopted, the pressing deformation is more than 15%, and the pressing time is less than 2 minutes; and then, maintaining the pressure for more than 20 minutes, wherein the deformation in the pressure maintaining process is controlled to be 5-15%, and the construction interface healing is favorably promoted.
According to one example, the steel blank may be a stainless steel blank or a carbon steel blank.
Furthermore, the shape of the steel blank can be a cuboid, a cube or a cylinder, namely, the blank shape applicable to the steel blank construction interface healing method is wide.
Example 1
The method for healing the steel billet construction interface is adopted to treat a cubic stainless steel billet, the length of the stainless steel billet is 1000mm, the width of the stainless steel billet is 1000mm, and the height of the stainless steel billet is 1500mm, and the treatment steps are as follows:
firstly, heating the sealed and welded stainless steel blank to 1240 +/-20 ℃, and enabling a constructed interface to be positioned in the horizontal direction;
secondly, placing the stainless steel blank on an operating platform of a 10000-ton oil press machine paved with heat insulation cotton, upsetting by using a flat anvil and avoiding staggering the anvil, wherein the upsetting mode is as follows: firstly, one-time rapid pressing is adopted, the pressing deformation is 35%, and the pressing time is 30 seconds; then, maintaining the pressure for 30 minutes, wherein the deformation in the pressure maintaining process is 25 percent;
thirdly, returning to the furnace, heating to 1240 +/-20 ℃ for diffusion bonding, and keeping the temperature for 24 hours after temperature equalization;
and fourthly, repeatedly forging to enable the total deformation amount in the length direction, the width direction and the height direction to be 40 percent, and finally achieving the required size.
Example 2
The steel billet construction interface healing method is adopted to treat a certain cylindrical stainless steel billet, the diameter of the bottom surface of the stainless steel billet is 800mm, the height of the stainless steel billet is 1600mm, and the treatment steps are as follows:
firstly, heating the sealed and welded stainless steel blank to 1200 +/-20 ℃, and enabling a constructed interface to be positioned in the horizontal direction;
secondly, placing the stainless steel blank on an operating platform of a 10000-ton oil press machine paved with heat insulation cotton, upsetting by using a flat anvil and avoiding staggering the anvil, wherein the upsetting mode is as follows: firstly, one-time rapid pressing is adopted, the pressing deformation is 35%, and the pressing time is 1 minute; then, maintaining the pressure for 20 minutes, wherein the deformation in the pressure maintaining process is 10 percent;
thirdly, returning to the furnace, heating to 1200 +/-20 ℃ for diffusion bonding, and keeping the temperature for 12 hours after temperature equalization;
fourthly, pressing for 25 minutes, returning to the furnace, heating to 1200 plus or minus 20 ℃ for diffusion bonding, and keeping the temperature for 12 hours after temperature equalization; the pressing deformation is 10%;
and fifthly, repeatedly forging to enable the total deformation of the radial dimension and the height to be 20 percent, and finally achieving the required dimension.
Example 3
The method for healing the steel billet construction interface is adopted to treat a cuboid carbon steel billet, the carbon steel billet is 1000mm long, 800mm wide and 1800mm high, and the treatment steps are as follows:
firstly, heating the sealed carbon steel blank to 1100 +/-20 ℃, and enabling a construction interface to be positioned in the horizontal direction;
secondly, placing the carbon steel blank on an operating platform of a 10000-ton oil press machine paved with heat preservation cotton, upsetting by using a flat anvil and avoiding staggering the anvil, wherein the upsetting mode is as follows: firstly, one-time rapid pressing is adopted, the pressing deformation is 30%, and the pressing time is 1 minute; then, maintaining the pressure for 25 minutes, wherein the deformation in the pressure maintaining process is 10 percent;
thirdly, returning to the furnace, heating to 1100 +/-20 ℃ for diffusion bonding, and keeping the temperature for 15 hours after temperature equalization;
fourthly, the following operations are carried out for 2 times: pressing for 20 minutes, wherein the pressing deformation is 7%; returning to the furnace, heating to 1100 +/-20 ℃ for diffusion bonding, and keeping the temperature for 15 hours after temperature equalization;
fifthly, the total deformation amount in the length direction, the width direction and the height direction is 30 percent through repeated forging, and finally the required size is achieved.
The steel blanks treated in examples 1-3 were examined and the results showed: after the steel billet construction interface healing method is used for treatment, the interface in the steel billet completely disappears, the interface bonding strength reaches the base material matrix strength, the problem of billet cracking does not occur, and a good construction interface healing effect is obtained.
Although a few embodiments in accordance with the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
Claims (6)
1. A method for healing a steel blank construction interface, the method comprising the steps of:
the method comprises the following steps: heating the sealed and welded steel blank, and enabling a construction interface to be positioned in the horizontal direction;
step two: upsetting by using a flat anvil and avoiding staggered anvils, wherein the upsetting mode is as follows: firstly, one-time rapid pressing is adopted, the pressing deformation is more than 30%, and the pressing time is less than 2 minutes; then, maintaining the pressure for more than 20 minutes, wherein the deformation in the pressure maintaining process is controlled to be 10-25%;
step three: returning, performing diffusion connection by heating, and keeping the temperature for more than 12 hours after temperature equalization;
step four: forging to make the total deformation not less than 20% and finally to reach the required size.
2. The method of healing a steel blank construction interface of claim 1, wherein: performing the following operations 1-2 times between the third step and the fourth step: pressing for more than 20 minutes, returning to the furnace, performing diffusion bonding by heating, and keeping the temperature for more than 12 hours after temperature equalization; the sum of the total deformation of the pressing in the operation 1-2 times and the deformation in the pressure maintaining process in the step two is controlled to be 10-25%; meanwhile, the deformation amount in the pressure maintaining process in the second step may be less than 10%.
3. The method of healing a steel blank construction interface of claim 1, wherein: when the external shape of the steel blank is hourglass-shaped, the upsetting mode is replaced by the following mode: firstly, one-time rapid pressing is adopted, the pressing deformation is more than 15%, and the pressing time is less than 2 minutes; and then, maintaining the pressure for more than 20 minutes, wherein the deformation in the pressure maintaining process is controlled to be 5-20%.
4. The method of healing a steel blank construction interface of claim 3, wherein: performing the following operations 1-2 times between the third step and the fourth step: pressing for more than 20 minutes, returning to the furnace, performing diffusion bonding by heating, and keeping the temperature for more than 12 hours after temperature equalization; the sum of the total deformation of the pressing in the operation 1-2 times and the deformation in the pressure maintaining process in the step two is controlled to be 5-20%; meanwhile, the deformation amount in the pressure maintaining process in the second step may be less than 5%.
5. The method of healing a steel blank construction interface of any one of claims 1-4, wherein: the steel blank is a stainless steel blank or a carbon steel blank.
6. The method of healing a steel blank construction interface of claim 1 or 2, wherein: the steel blank is in a cuboid, cube or cylinder shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110458506.7A CN113523707B (en) | 2018-11-14 | 2018-11-14 | Method for healing deformation of construction interface |
| CN201811350464.XA CN109604926B (en) | 2018-11-14 | 2018-11-14 | Steel blank construction interface healing method |
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| CN201811350464.XA CN109604926B (en) | 2018-11-14 | 2018-11-14 | Steel blank construction interface healing method |
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| CN202110458506.7A Active CN113523707B (en) | 2018-11-14 | 2018-11-14 | Method for healing deformation of construction interface |
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| CN111036812B (en) * | 2019-12-27 | 2022-03-01 | 天津重型装备工程研究有限公司 | Method for controlling oxide on bonding interface of metal composite product |
| CN112845744B (en) * | 2021-01-05 | 2022-04-08 | 中国第一重型机械股份公司 | Preparation method of metal solid-solid composite additive blank |
| CN112903954A (en) * | 2021-01-22 | 2021-06-04 | 大连理工大学 | Interface healing performance evaluation method for metal substrate construction forming |
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| JPS579553A (en) * | 1980-06-23 | 1982-01-19 | Daido Steel Co Ltd | Forging method |
| CN102581543A (en) * | 2012-03-01 | 2012-07-18 | 宁夏天地奔牛实业集团有限公司 | Repair method for forging die |
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| US3794805A (en) * | 1971-07-02 | 1974-02-26 | W Rudd | Magnetic pulse welding using spaced proximity conductor |
| JP2001340938A (en) * | 2000-05-30 | 2001-12-11 | Daido Steel Co Ltd | Forging method for discoidal forging |
| CN102756062B (en) * | 2012-07-02 | 2016-03-02 | 中国科学院金属研究所 | A kind of forging method of high efficiency healing larger ratio of height to diameter blank inner void type defect |
| CN102500733B (en) * | 2011-09-22 | 2014-08-13 | 中国科学院金属研究所 | Forging method for efficiently healing internal hole-type defects of steel ingot |
| EP2762247A4 (en) * | 2011-09-22 | 2015-08-19 | Inst Metal Res Chinese Acad Sc | Forging method for high-efficiency closing of porous defects in steel ingots or billets |
| CN104624900B (en) * | 2015-02-11 | 2017-04-19 | 中国科学院金属研究所 | Forging method for efficiently recovering internal defects of thin plate forged pieces |
| KR102006372B1 (en) * | 2015-03-26 | 2019-08-01 | 중국과학원금속연구소 | Construction molding method for manufacturing homogenized forgings |
| CN106312454B (en) * | 2016-08-29 | 2018-11-13 | 辽宁北祥重工机械制造有限公司 | The method of the folded forging production main shaft forging of multiple-unit homogenous metal |
| CN106475679B (en) * | 2016-11-30 | 2018-07-27 | 山东大学 | A kind of discontinuous pressure process diffusion connecting process of unrepeatered transmission of copper and aluminium alloy |
| CN106975719B (en) * | 2017-06-01 | 2019-03-12 | 东南大学 | A kind of forging method of cogging |
| CN107520584B (en) * | 2017-09-15 | 2020-03-24 | 中国原子能科学研究院 | Special-shaped metal construction forming method |
| CN107717341A (en) * | 2017-09-15 | 2018-02-23 | 中国原子能科学研究院 | Modular metal constructs manufacturing process |
| CN108188659A (en) * | 2017-12-21 | 2018-06-22 | 中国原子能科学研究院 | A kind of manufacturing process of steel billet |
| CN108435998A (en) * | 2018-02-28 | 2018-08-24 | 武汉理工大学 | A kind of compound base hot rolling manufacturing process of ring |
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- 2018-11-14 CN CN201811350464.XA patent/CN109604926B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS579553A (en) * | 1980-06-23 | 1982-01-19 | Daido Steel Co Ltd | Forging method |
| CN102581543A (en) * | 2012-03-01 | 2012-07-18 | 宁夏天地奔牛实业集团有限公司 | Repair method for forging die |
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| CN113523707B (en) | 2022-05-13 |
| CN109604926A (en) | 2019-04-12 |
| CN113523707A (en) | 2021-10-22 |
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