CN111636042A - Method for improving malleability of intermetallic compound alloy - Google Patents
Method for improving malleability of intermetallic compound alloy Download PDFInfo
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- CN111636042A CN111636042A CN202010533660.1A CN202010533660A CN111636042A CN 111636042 A CN111636042 A CN 111636042A CN 202010533660 A CN202010533660 A CN 202010533660A CN 111636042 A CN111636042 A CN 111636042A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
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- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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Abstract
The invention discloses a method for improving the forgeability of an intermetallic compound alloy, which belongs to the technical field of an intermetallic compound forging process, and the technical scheme is characterized by comprising the following steps: s1, heating: heating the Ti2AlNb alloy material to an alpha 2+ B2 phase region in a heating furnace, and then preserving heat; s2, wide anvil upsetting: transferring the Ti2AlNb alloy material from the furnace to a forging device, and upsetting to 1/2 of the original length; s3, narrow anvil upsetting: continuously upsetting the Ti2AlNb alloy material; s4, returning: the Ti2AlNb alloy material is subjected to remelting and heating to an alpha 2+ B2+ O three-phase region, and then heat preservation is carried out; s5, punching: taking out the Ti2AlNb alloy material and punching by using a punch; s6, secondary remelting: the Ti2AlNb alloy material is subjected to remelting and heating to an alpha 2+ B2+ O three-phase region, and then heat preservation is carried out; s7, ring rolling: rolling a ring by using a Ti2AlNb alloy material; s8, cooling after forging: the invention has the advantages that cogging is carried out at higher temperature, small deformation forming is carried out in a low-temperature area, and the alloy has good mechanical property and dynamic crystallization simultaneously.
Description
Technical Field
The invention relates to the technical field of intermetallic compound forging processes, in particular to a method for improving the forgeability of an intermetallic compound alloy.
Background
The intermetallic compound is a compound formed by metal and metal or metal and nonmetal, and the Ti2AlNb intermetallic compound alloy is a new generation intermetallic compound, has high room temperature plasticity, high temperature strength and oxidation resistance, and is one of the most potential aerospace engine materials in the temperature range of 650-750 ℃.
At present, the Ti2AlNb intermetallic compound alloy has a narrow forgeable area, generally carries out forging forming in an alpha 2+ B2 two-phase region, has fine grain size of about 70um, but has poorer forging plasticity compared with forging in an alpha 2 phase region. The forging plasticity is the worst in the alpha 2+ B2+ O three-phase region, and the mechanical property of the product is the best at the moment. The main problem to be solved is to balance the relation between forging plasticity and final mechanical property, and not only can obtain good mechanical property and generate dynamic crystallization while having good forgeability.
Disclosure of Invention
The invention aims to provide a method for improving the forgeability of an intermetallic compound alloy, which has the advantages that the Ti2AlNb intermetallic compound alloy is subjected to cogging at a higher temperature and small deformation forming in a low-temperature area, and the alloy has good mechanical properties and is subjected to dynamic crystallization at the same time.
The technical purpose of the invention is realized by the following technical scheme:
a method of improving forgeability of an intermetallic alloy, comprising the steps of:
s1, heating: heating the Ti2AlNb alloy material to an alpha 2+ B2 phase region in a heating furnace, and then carrying out heat preservation on the Ti2AlNb alloy material;
s2, wide anvil upsetting: transferring the Ti2AlNb alloy material from the furnace to forging equipment, erecting to enable the axis to be vertical to the horizontal plane for upsetting, and upsetting to 1/2 of the original length;
s3, narrow anvil upsetting: continuously upsetting the Ti2AlNb alloy material to a cogging required height by using a spinning mode;
s4, returning: the Ti2AlNb alloy material is subjected to remelting and heating to an alpha 2+ B2+ O three-phase region, and then heat preservation is carried out;
s5, punching: taking out the Ti2AlNb alloy material and punching by using a punch;
s6, secondary remelting: the Ti2AlNb alloy material is subjected to remelting and heating to an alpha 2+ B2+ O three-phase region, and then heat preservation is carried out;
s7, ring rolling: taking the Ti2AlNb alloy material out of the heating furnace, placing the material on a ring rolling machine for ring rolling, and finally rolling and forming;
s8, cooling after forging: and (5) spreading the forged piece in a pre-ground manner for air cooling.
Further, in step S1, the heat-preserving time is in the range of 90min to 120 min.
Further, in step S1, the heating temperature error of the Ti2AlNb alloy material is ± 20 ℃.
Further, in step S4, the heat-retaining time is in the range of 60min to 90 min.
Further, in step S4, the heating temperature error of the Ti2AlNb alloy material is ± 20 ℃.
Further, in step S6, the heat-retaining time is in the range of 60min to 80 min.
Further, in step S6, the heating temperature error of the Ti2AlNb alloy material is ± 15 ℃.
Furthermore, in step S6, the rolling speed is less than or equal to 0.3mm/min, and the linear speed is less than or equal to 800mm/S and less than or equal to Vr and less than or equal to 1000 mm/S.
In conclusion, the invention has the following beneficial effects:
1. the Ti2AlNb intermetallic compound alloy material is heated and insulated in an alpha 2+ B2 two-phase region and then is cogging, the grain size is finer at about 70um, the material is beneficial to improving the forgeability and plasticity of the material and preventing cracking, the ring rolling is carried out in an alpha 2+ B2+ O three-phase region, and finally the final mechanical property of the product can be improved by carrying out ring rolling forming in the three-phase region;
2. by controlling the heating temperature of the forge piece, the size of the deformation and the cooling after forging, the relation between the forging plasticity and the final mechanical property is further balanced, and the forge piece has good forgeability, good mechanical property and dynamic crystallization.
Drawings
FIG. 1 is a schematic representation of the steps of a method for promoting forgeability of an intermetallic alloy.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: a method for improving forgeability of intermetallic compound alloy, as shown in fig. 1, comprising the steps of:
s1, heating: firstly, a worker prepares a Ti2AlNb alloy material, the Ti2AlNb alloy material is a bar material, the Ti2AlNb alloy material is heated to an alpha 2+ B2 phase region in a heating furnace, the heating temperature error is +/-20 ℃, and then the Ti2AlNb alloy material is subjected to heat preservation for 90 min.
S2, wide anvil upsetting: the Ti2AlNb alloy material was transferred from the furnace to a forging apparatus and upset with the axis perpendicular to the horizontal to 1/2 on its original length.
S3, narrow anvil upsetting: and continuously upsetting the Ti2AlNb alloy material to the height required by cogging by using a spinning mode.
S4, returning: and (3) melting back the Ti2AlNb alloy material and heating to an alpha 2+ B2+ O three-phase region, wherein the heating temperature error is +/-20 ℃, and then carrying out heat preservation for 60 min.
S5, punching: the Ti2AlNb alloy material is taken out and punched by using a punch. The Ti2AlNb alloy material is in a three-phase region, so that the Ti2AlNb alloy material has good plasticity and is beneficial to shape change of the Ti2AlNb alloy material.
S6, secondary remelting: and (3) melting back the Ti2AlNb alloy material and heating to an alpha 2+ B2+ O three-phase region, wherein the heating temperature error is +/-15 ℃, and then carrying out heat preservation for 60 min.
S7, ring rolling: taking the Ti2AlNb alloy material out of the heating furnace, placing the material on a ring rolling machine for ring rolling, and finally rolling and forming, wherein in the ring rolling, the rolling speed is less than or equal to 0.3mm/min, and the linear speed is less than or equal to 800mm/s and Vr is less than or equal to 1000 mm/s.
S8, cooling after forging: and (5) spreading the forged piece on the ground in advance for air cooling, and finally obtaining the required product.
Product detection: the product has no serious cracks, and the grain size of the product is checked to be 5-7 grades.
Example 2: a method for improving the forgeability of intermetallic compound alloy, which is different from the method of the embodiment 1 in the following steps:
s1, heating: firstly, a worker prepares a Ti2AlNb alloy material, the Ti2AlNb alloy material is a bar material, the Ti2AlNb alloy material is heated to an alpha 2+ B2 phase region in a heating furnace, the heating temperature error is +/-20 ℃, and then the Ti2AlNb alloy material is subjected to heat preservation for 105 min.
S4, returning: and (3) melting back the Ti2AlNb alloy material, heating to an alpha 2+ B2+ O three-phase region with the heating temperature error of +/-20 ℃, and then carrying out heat preservation for 75 min.
S6, secondary remelting: and (3) melting back the Ti2AlNb alloy material, heating to an alpha 2+ B2+ O three-phase region with the heating temperature error of +/-15 ℃, and then carrying out heat preservation for 70 min.
Product detection: the product has no serious cracks, and the grain size of the product is checked to be 5-7 grades.
Example 3: a method for improving the forgeability of intermetallic compound alloy, which is different from the method of the embodiment 1 in the following steps:
s1, heating: firstly, a worker prepares a Ti2AlNb alloy material, the Ti2AlNb alloy material is a bar material, the Ti2AlNb alloy material is heated to an alpha 2+ B2 phase region in a heating furnace, the heating temperature error is +/-20 ℃, and then the Ti2AlNb alloy material is subjected to heat preservation for 120 min.
S4, returning: and (3) melting back the Ti2AlNb alloy material and heating to an alpha 2+ B2+ O three-phase region, wherein the heating temperature error is +/-20 ℃, and then carrying out heat preservation for 90 min.
S6, secondary remelting: and (3) melting back the Ti2AlNb alloy material and heating to an alpha 2+ B2+ O three-phase region, wherein the heating temperature error is +/-15 ℃, and then carrying out heat preservation for 80 min.
Product detection: the product has no serious cracks, and the grain size of the product is checked to be 5-7 grades.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. A method of improving forgeability of an intermetallic alloy, comprising the steps of:
s1, heating: heating the Ti2AlNb alloy material to an alpha 2+ B2 phase region in a heating furnace, and then carrying out heat preservation on the Ti2AlNb alloy material;
s2, wide anvil upsetting: transferring the Ti2AlNb alloy material from the furnace to forging equipment, erecting to enable the axis to be vertical to the horizontal plane for upsetting, and upsetting to 1/2 of the original length;
s3, narrow anvil upsetting: continuously upsetting the Ti2AlNb alloy material to a cogging required height by using a spinning mode;
s4, returning: the Ti2AlNb alloy material is subjected to remelting and heating to an alpha 2+ B2+ O three-phase region, and then heat preservation is carried out;
s5, punching: taking out the Ti2AlNb alloy material and punching by using a punch;
s6, secondary remelting: the Ti2AlNb alloy material is subjected to remelting and heating to an alpha 2+ B2+ O three-phase region, and then heat preservation is carried out;
s7, ring rolling: taking the Ti2AlNb alloy material out of the heating furnace, placing the material on a ring rolling machine for ring rolling, and finally rolling and forming;
s8, cooling after forging: and (5) spreading the forged piece in a pre-ground manner for air cooling.
2. The method of improving forgeability of intermetallic alloy of claim 1, wherein: in step S1, the heat-retaining time is in the range of 90min to 120 min.
3. The method of improving forgeability of intermetallic alloy of claim 1, wherein: in step S1, the heating temperature error of the Ti2AlNb alloy material is ± 20 ℃.
4. The method of improving forgeability of intermetallic alloy of claim 1, wherein: in step S4, the heat-retaining time is 60min to 90 min.
5. The method of improving forgeability of intermetallic alloy of claim 1, wherein: in step S4, the heating temperature error of the Ti2AlNb alloy material is ± 20 ℃.
6. The method of improving forgeability of intermetallic alloy of claim 1, wherein: in step S6, the heat-retaining time is 60min to 80 min.
7. The method of improving forgeability of intermetallic alloy of claim 1, wherein: in step S6, the heating temperature error of the Ti2AlNb alloy material is ± 15 ℃.
8. The method of improving forgeability of intermetallic alloy of claim 1, wherein: in step S6, the rolling speed is less than or equal to 0.3mm/min, and the linear speed is less than or equal to 800mm/S and less than or equal to Vr and less than or equal to 1000 mm/S.
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Cited By (3)
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| CN112275966A (en) * | 2020-12-24 | 2021-01-29 | 北京钢研高纳科技股份有限公司 | Large specification of Ti2AlNb alloy ring piece and manufacturing method thereof |
| CN114273583A (en) * | 2021-12-23 | 2022-04-05 | 北京钢研高纳科技股份有限公司 | Ti2AlNb-based alloy plate and preparation method and application thereof |
| CN115971492A (en) * | 2022-09-30 | 2023-04-18 | 北京钢研高纳科技股份有限公司 | Ti2AlNb alloy plate and preparation method and application thereof |
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| CN112275966A (en) * | 2020-12-24 | 2021-01-29 | 北京钢研高纳科技股份有限公司 | Large specification of Ti2AlNb alloy ring piece and manufacturing method thereof |
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| CN115971492A (en) * | 2022-09-30 | 2023-04-18 | 北京钢研高纳科技股份有限公司 | Ti2AlNb alloy plate and preparation method and application thereof |
| CN115971492B (en) * | 2022-09-30 | 2024-03-15 | 北京钢研高纳科技股份有限公司 | Ti2AlNb alloy plate and preparation method and application thereof |
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