CN104988443A - Preparation method for titanium alloy plate blank - Google Patents
Preparation method for titanium alloy plate blank Download PDFInfo
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- CN104988443A CN104988443A CN201510285625.1A CN201510285625A CN104988443A CN 104988443 A CN104988443 A CN 104988443A CN 201510285625 A CN201510285625 A CN 201510285625A CN 104988443 A CN104988443 A CN 104988443A
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Abstract
The invention discloses a preparation method for a titanium alloy plate blank. The method comprises the following steps: providing a titanium alloy cast ingot and a vacuum consumable electro-arc furnace, and smelting the titanium alloy cast ingot in the vacuum consumable electro-arc furnace; forming a cast ingot to be subjected to cogging, a primary forging blank and a to-be-forged forging blank in sequence, heating the to-be-forged forging blank below a beta-phase transformation point, rotating the to-be-forged forging blank along an axial plane by 90 degrees and then forming a to-be-forged plate blank by carrying out transverse extension deformation forging on a quick forging press; and heating the to-be-forged plate blank below the beta-phase transformation point, rotating the to-be-forged plate blank along the axial plane by 90 degrees and then forming a finished product plat blank by carrying out longitudinal extension deformation forging on the quick forging press. Compared with a small-specification plate blank produced by a conventional small-specification plate blank forging technology, a large-specification high-performance titanium alloy plate blank produced by the method disclosed by the invention is greatly improved in unit weight and width, good in structural homogeneity and capable of meeting rolling requirements of a high-performance thick plate.
Description
Technical field
The present invention relates to titanium and its alloy work field, particularly relate to a kind of preparation method of middle strength titanium alloy ultra-wide high-performance heavy slab.
Background technology
TC4 ELI titanium alloy is widely applied in the field such as Aeronautics and Astronautics, naval vessel.At present, the slab that the TC4 ELI titanium alloy plate of suitability for industrialized production uses, mostly only in single phase region cogging or have portion deforms in two-phase region, carries out many fire time rollings afterwards, is produced into sheet material in two-phase region.The forging method of slab only adopts the forging mode of simple axially pulling to produce, and its object is only preliminary broken as-cast structure.
Prior art produces the technique of slab, adopt the mode of axially pulling to forge by after ingot casting heating, because domestic produced maximum specification ingot diameters is Ф 1000mm at present, by the restriction of ingot casting specification, the width of plate slab produced is limited, fertile width of plate slab is not more than 1200mm, the largest production width of restriction finished product sheet material.
And existing production method requires lower to the structural state of slab, and do not carry out two-phase region distortion in production process, or only have a small amount of distortion in two-phase region, its deflection is not more than 50%.Cause the fragmentation of original β crystal boundary insufficient, slab uneven microstructure.The rolling requirements that thickness is greater than the high-quality heavy-gauge sheeting of 70mm can not be met.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of preparation method of titanium alloy slab, comprising the steps:
One titan alloy casting ingot and vacuum consumable electrode arc furnace are provided, described titan alloy casting ingot is carried out melting at vacuum consumable electrode arc furnace;
Remove the described titan alloy casting ingot surface imperfection after melting, excise at the bottom of described titan alloy casting ingot rising head and ingot simultaneously, formed and treat cogging ingot casting;
Described after cogging ingot casting surface smear antioxidation coating, then after putting it into gas furnace heating, quick forging machine forms elementary forging stock by upsetting pull distortion forging;
After described elementary forging stock being heated more than beta transformation point, quick forging machine forms forging stock to be forged by upsetting pull distortion forging;
After described forging stock to be forged being heated below beta transformation point, and by described forging stock to be forged vertically Plane Rotation 90 ° in quick forging machine by lateral extension distortion forging formed slab to be forged;
After described slab to be forged being heated below beta transformation point, and by described slab to be forged vertically Plane Rotation 90 ° in quick forging machine, form finished product slab by distortion forging of longitudinally extending.
In a kind of preferred embodiment of the present invention, described titan alloy casting ingot is TC4 ELI titan alloy casting ingot.
In a kind of preferred embodiment of the present invention, described elementary forging stock forging process is:
The shove charge of cogging ingot casting will be treated after when Sweet natural gas in-furnace temperature reaches 800 ~ 850 DEG C;
Stove inside holding 2 ~ 4 hours, be warmed up to 1100 ~ 1150 DEG C, be incubated after 3 ~ 4 hours, come out of the stove and carry out time upsetting pull distortion of 1 ~ 2 fire in quick forging machine, form elementary forging stock, forging ratio controls 5.0 ~ 7.8;
Described forging stock forging process to be forged is: elementary forging stock after 50 ~ 80 DEG C of heating, quick forging machine is carried out the forging that 2 ~ 3 fire are secondary in resistance furnace more than beta transformation point; Form forging stock to be forged, forging ratio controls 5.0 ~ 7.8.
Described slab forging process to be forged is: forging stock to be forged after 20 ~ 50 DEG C of heating, quick forging machine is carried out time first forging of 1 ~ 2 fire in resistance furnace below beta transformation point; Form slab to be forged, forging ratio controls 2.0 ~ 2.5.
Described finished product slab forging process is: slab to be forged after 20 ~ 50 DEG C of heating, quick forging machine is carried out time forging of 1 ~ 2 fire in resistance furnace below beta transformation point; Form finished product slab, forging ratio controls 2.0 ~ 2.5.
In a kind of preferred embodiment of the present invention, described titan alloy casting ingot carries out three meltings at vacuum consumable electrode arc furnace.
In a kind of preferred embodiment of the present invention, described antioxidation coating is TB1200 electronics silica gel, and adds the binding agent NJ-1 of 5 ~ 15%, and smearing thickness controls at 0.2 ~ 0.5 ㎜.
Compared to prior art, the preparation method of titanium alloy slab provided by the invention has the following advantages:
1, by three vacuum consumable electrode arc furnace meltings, ingot casting composition can be made evenly, segregation is little, and subsurface defect is few.
2, excise at the bottom of rising head and ingot, remove the defect on ingot casting surface, get rid of ingot casting melting defect in advance to the impact of subsequent production.
3, the cogging stage heats at gas furnace, has saved tooling cost.
4, before cogging heating, special inoxidzable coating is smeared to ingot casting, the gas contamination caused when preventing from heating in gas furnace.
5, the present invention increase single phase region and alpha+beta two-phase region upsetting pull distortion, increase deflection, abundant broken as-cast structure and Original β grain, for plate rolling tissue is provided evenly structural state.
6, the width of forging slab can significantly be improved.Considerably increase transverse deformation simultaneously, slab different directions tissue consistency is improved.
Embodiment
Be clearly and completely described technical scheme of the present invention below in conjunction with the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
The present invention discloses a kind of preparation method of titanium alloy slab, comprises the steps:
One titan alloy casting ingot and vacuum consumable electrode arc furnace are provided, described titan alloy casting ingot is carried out melting at vacuum consumable electrode arc furnace;
Remove the described titan alloy casting ingot surface imperfection after melting, excise at the bottom of described titan alloy casting ingot rising head and ingot simultaneously, formed and treat cogging ingot casting;
Described after cogging ingot casting surface smear antioxidation coating, then after putting it into gas furnace heating, quick forging machine forms elementary forging stock by upsetting pull distortion forging;
After described elementary forging stock being heated more than beta transformation point, quick forging machine forms forging stock to be forged by upsetting pull distortion forging;
After described forging stock to be forged being heated below beta transformation point, and by described forging stock to be forged vertically Plane Rotation 90 ° in quick forging machine by lateral extension distortion forging formed slab to be forged;
After described slab to be forged being heated below beta transformation point, and by described slab to be forged vertically Plane Rotation 90 ° in quick forging machine, form finished product slab by distortion forging of longitudinally extending.
In the present embodiment, described titan alloy casting ingot is TC4 ELI titan alloy casting ingot.
Described elementary forging stock forging process is:
The shove charge of cogging ingot casting will be treated after when Sweet natural gas in-furnace temperature reaches 800 ~ 850 DEG C;
Stove inside holding 2 ~ 4 hours, be warmed up to 1100 ~ 1150 DEG C, be incubated after 3 ~ 4 hours, come out of the stove and carry out time upsetting pull distortion of 1 ~ 2 fire in quick forging machine, form elementary forging stock, forging ratio controls 5.0 ~ 7.8;
Described forging stock forging process to be forged is:
Elementary forging stock after 50 ~ 80 DEG C of heating, quick forging machine is carried out the forging that 2 ~ 3 fire are secondary in resistance furnace more than beta transformation point; Form forging stock to be forged, forging ratio controls 5.0 ~ 7.8.
Described slab forging process to be forged is:
Forging stock to be forged after 20 ~ 50 DEG C of heating, quick forging machine is carried out time first forging of 1 ~ 2 fire in resistance furnace below beta transformation point; Form slab to be forged, forging ratio controls 2.0 ~ 2.5.
Described finished product slab forging process is:
Slab to be forged after 20 ~ 50 DEG C of heating, quick forging machine is carried out time forging of 1 ~ 2 fire in resistance furnace below beta transformation point; Form finished product slab, forging ratio controls 2.0 ~ 2.5.
In the present embodiment, described titan alloy casting ingot carries out three meltings at vacuum consumable electrode arc furnace, and described antioxidation coating is TB1200 electronics silica gel, and adds the binding agent NJ-1 of 5 ~ 15%, and smearing thickness controls at 0.2 ~ 0.5 ㎜.
Adopt the large gauge Ti alloy with high performance slab that present method is produced, compare with traditional small dimension slab forging manufacturing technique, substance and the width of blank significantly improve, and can reach more than 1.5 tons.Width of plate slab can reach more than 1800mm; Compared with other large gauge slab forging methods existing, the method produce slab its be organized as the worked structure of typical two-phase region, homogeneity of structure is good, and it is good that primary α content is about 35 ~ 60%, α phase nodularization effect.Different directions histological difference is little.Can meet thickness and be greater than 70mm, width is greater than the rolling requirements of the high-performance heavy-gauge sheeting of 1500mm.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. a preparation method for titanium alloy slab, is characterized in that, comprises the steps:
One titan alloy casting ingot and vacuum consumable electrode arc furnace are provided, described titan alloy casting ingot is carried out melting at vacuum consumable electrode arc furnace;
Remove the described titan alloy casting ingot surface imperfection after melting, excise at the bottom of described titan alloy casting ingot rising head and ingot simultaneously, formed and treat cogging ingot casting;
Described after cogging ingot casting surface smear antioxidation coating, then after putting it into gas furnace heating, quick forging machine forms elementary forging stock by upsetting pull distortion forging;
After described elementary forging stock being heated more than beta transformation point, quick forging machine forms forging stock to be forged by upsetting pull distortion forging;
After described forging stock to be forged being heated below beta transformation point, and by described forging stock to be forged vertically Plane Rotation 90 ° in quick forging machine by lateral extension distortion forging formed slab to be forged;
After described slab to be forged being heated below beta transformation point, and by described slab to be forged vertically Plane Rotation 90 ° in quick forging machine, form finished product slab by distortion forging of longitudinally extending.
2. the preparation method of titanium alloy slab according to claim 1, is characterized in that, described titan alloy casting ingot is TC4 ELI titan alloy casting ingot.
3. the preparation method of titanium alloy slab according to claim 2, is characterized in that, described elementary forging stock forging process is:
The shove charge of cogging ingot casting will be treated after when Sweet natural gas in-furnace temperature reaches 800 ~ 850 DEG C;
Stove inside holding 2 ~ 4 hours, be warmed up to 1100 ~ 1150 DEG C, be incubated after 3 ~ 4 hours, come out of the stove and carry out time upsetting pull distortion of 1 ~ 2 fire in quick forging machine, form elementary forging stock, forging ratio controls 5.0 ~ 7.8;
Described forging stock forging process to be forged is:
Elementary forging stock after 50 ~ 80 DEG C of heating, quick forging machine is carried out the forging that 2 ~ 3 fire are secondary in resistance furnace more than beta transformation point; Form forging stock to be forged, forging ratio controls 5.0 ~ 7.8;
Described slab forging process to be forged is:
Forging stock to be forged after 20 ~ 50 DEG C of heating, quick forging machine is carried out time first forging of 1 ~ 2 fire in resistance furnace below beta transformation point; Form slab to be forged, forging ratio controls 2.0 ~ 2.5;
Described finished product slab forging process is:
Slab to be forged after 20 ~ 50 DEG C of heating, quick forging machine is carried out time forging of 1 ~ 2 fire in resistance furnace below beta transformation point; Form finished product slab, forging ratio controls 2.0 ~ 2.5.
4. the preparation method of the titanium alloy slab according to claim 1 or 2 or 3, is characterized in that, described titan alloy casting ingot carries out three meltings at vacuum consumable electrode arc furnace.
5. the preparation method of titanium alloy slab according to claim 4, is characterized in that, described antioxidation coating is TB1200 electronics silica gel, and adds the binding agent NJ-1 of 5 ~ 15%, and smearing thickness controls at 0.2 ~ 0.5 ㎜.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105603346A (en) * | 2015-10-28 | 2016-05-25 | 西部超导材料科技股份有限公司 | Forging method for improving microstructure uniformity of TC18 titanium alloy bars |
| CN106392490A (en) * | 2016-11-15 | 2017-02-15 | 宝鸡钛业股份有限公司 | Machining method for large-sized fine-grained pure-titanium bar |
| CN106756692A (en) * | 2016-12-14 | 2017-05-31 | 中南大学 | A kind of two pass of raising TC4 titanium alloy lamellar structure Oxygen potentials time forging method |
| CN109396311A (en) * | 2018-12-11 | 2019-03-01 | 陕西宏远航空锻造有限责任公司 | A kind of press machine titanium alloy beta forging molding forging method and device |
| CN110508732A (en) * | 2019-08-29 | 2019-11-29 | 陕西天成航空材料有限公司 | Eliminate the method for forging and molding of TC4 titanium alloy slab end month dental impression |
| CN112108606A (en) * | 2020-09-07 | 2020-12-22 | 中国航发北京航空材料研究院 | Preparation method of titanium alloy forging |
| CN112959004A (en) * | 2021-02-02 | 2021-06-15 | 湖南湘投金天科技集团有限责任公司 | High-strength titanium alloy seal head and preparation method thereof |
| CN113751637A (en) * | 2021-09-16 | 2021-12-07 | 湖南金天钛业科技有限公司 | Forging method for improving yield of large-size titanium plate blank |
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| CN106756692A (en) * | 2016-12-14 | 2017-05-31 | 中南大学 | A kind of two pass of raising TC4 titanium alloy lamellar structure Oxygen potentials time forging method |
| CN109396311A (en) * | 2018-12-11 | 2019-03-01 | 陕西宏远航空锻造有限责任公司 | A kind of press machine titanium alloy beta forging molding forging method and device |
| CN110508732A (en) * | 2019-08-29 | 2019-11-29 | 陕西天成航空材料有限公司 | Eliminate the method for forging and molding of TC4 titanium alloy slab end month dental impression |
| CN112108606A (en) * | 2020-09-07 | 2020-12-22 | 中国航发北京航空材料研究院 | Preparation method of titanium alloy forging |
| CN112959004A (en) * | 2021-02-02 | 2021-06-15 | 湖南湘投金天科技集团有限责任公司 | High-strength titanium alloy seal head and preparation method thereof |
| CN113751637A (en) * | 2021-09-16 | 2021-12-07 | 湖南金天钛业科技有限公司 | Forging method for improving yield of large-size titanium plate blank |
| CN113751637B (en) * | 2021-09-16 | 2023-08-18 | 湖南湘投金天钛业科技股份有限公司 | Forging method for improving yield of large-sized titanium plate blank |
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