CN102776457A - Method for improving comprehensive mechanical properties of vanadium, chromium and titanium alloy prepared by powder metallurgy by die forging technology - Google Patents
Method for improving comprehensive mechanical properties of vanadium, chromium and titanium alloy prepared by powder metallurgy by die forging technology Download PDFInfo
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- CN102776457A CN102776457A CN2012102657945A CN201210265794A CN102776457A CN 102776457 A CN102776457 A CN 102776457A CN 2012102657945 A CN2012102657945 A CN 2012102657945A CN 201210265794 A CN201210265794 A CN 201210265794A CN 102776457 A CN102776457 A CN 102776457A
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Abstract
The invention relates to a method for improving comprehensive mechanical properties of a vanadium, chromium and titanium alloy prepared by powder metallurgy by a die forging technology, and relates to a method for enhancing the mechanical properties of the alloy prepared by the powder metallurgy method by die forging deformation treatment in order to solve the problems that the vanadium, chromium and titanium alloy prepared by the traditional powder metallurgy method has low mechanical properties. The adopted technical scheme is as follows: the complicated-shaped vanadium, chromium and titanium alloy prepared by the powder metallurgy method is packaged by a stainless steel sheath for hot isostatic densification treatment, and then is packaged by the second layer of sheath to obtain a die forging perform of the vanadium, chromium and titanium alloy; and the vanadium, chromium and titanium alloy is treated by die forging deformation, and is further subjected to vacuum annealing to obtain a vanadium, chromium and titanium alloy blank with superior comprehensive mechanical properties. The technical method has the advantages of simple process, convenience in operation and low manufacturing cost, and is suitable for enhancing the comprehensive mechanical properties of the complicated-shaped vanadium, chromium and titanium alloy blank prepared by the powder metallurgy method in batches.
Description
Technical field
The alloy that the present invention relates to a kind of powder metallurgic method preparation adopts the hot closed-die forging deformation process to promote the method for mechanical property, more precisely relates to the method that the hot closed-die forging technology improves powder metallurgy vanadium chromium titanium alloy comprehensive mechanical property.
Background technology
Vanadium alloy has low irradiation activation property, good mechanical property, high thermal conductivity, good anti-void swelling property, low heat expansion property, high strength; Can bear the advantages such as thermal load higher 4 ~ 7 times, the increasing fields such as aviation, national defence, nucleosynthesis and hot environment that are applied to than stainless steel.
Nineteen sixties, the U.S. took the lead in starting the basic research work of vanadium alloy, and there are Argonne National Laboratory and Oak Ridge National Laboratory in main research institution; To the late nineteen eighties the U.S. with the ternary alloy of vanadium chromium titanium alloy system as the primary study object; Get into the nineties, under the promotion of international thermonuclear experimental reactor (ITER) international cooperative project, more and more countries and research institution recognize the importance of vanadium chromium titanium alloy system, have also started the research of vanadium chromium titanium ternary alloy.Along with to the further investigation of fusion reactor with material, the U.S., Russia, European Union and Japan have carried out a large amount of systematic research work to vanadium-base alloy, and China is just to begin in nearly ten years to the research of vanadium vanadium chromium titanium alloy.Should have good anti-irradiation expansion and dimensional stability, good room temperature and mechanical behavior under high temperature, security and environmental characteristics as fusion with structured material vanadium chromium titanium alloy, have favorable compatibility etc. with tritium multiplication agent, refrigerant, neutron-multiplier material with towards plasma material.
The thermal processing distortion drag of vanadium chromium titanium alloy is big, and plasticity is low, in the forging and the operation of rolling, is easy to generate defectives such as crackle and fragmentation.For accessing the vanadium chromium titanium alloy material of excellent performance, must carry out thermal pressure to it and process and improve structure refinement crystal grain, improving its processing characteristics and mechanical property, thereby satisfy requirement of actual application.
At present, generally adopt the method for vacuum consumable arc-melting to prepare vanadium chromium titanium alloy both at home and abroad, and adopt the method for powder metallurgy forming less relatively.Vanadium chromium titanium alloy its comprehensive mechanical property after isostatic cool pressing, sintering and hip treatment of the method preparation of employing powder metallurgy forming is low, does not reach the use properties requirement of fusion with structured material.
Summary of the invention
The objective of the invention is to solve the low problem of vanadium chromium titanium alloy mechanical property of existing powder metallurgic method preparation; Provide a kind of hot closed-die forging technology to improve the method for powder metallurgy vanadium chromium titanium alloy comprehensive mechanical property; This technological method technology is simple; Easy to operate, low cost of manufacture, suitable batch promotes the complicated shape vanadium chromium titanium alloy blank comprehensive mechanical property of powder metallurgic method preparation.
For achieving the above object, the technical scheme that the present invention adopts is: the hot closed-die forging technology improves the method for powder metallurgy vanadium chromium titanium alloy comprehensive mechanical property, comprises the following steps:
A, the preparation of complicated shape vanadium chromium titanium alloy blank: with granularity is 15 μ m～60 μ m vanadium, chromium, titanium fine powder; 88-92:4-6:4-6 is made into compound according to mass ratio; Adopt the charging of mantle frock and the room temperature of complicated shape to vacuumize degasification; Isostatic cool pressing is handled the final vacuum sintering, obtains the vanadium chromium titanium alloy blank of complicated shape; Said here complicated shape mainly is to be different from single columnar structure, and circular configuration or square structure are meant that especially the small end of cone-shaped body is connected the one-piece construction that the back forms with the column end.
B, the preparation of vanadium chromium titanium alloy hot closed-die forging precast billet: the vanadium chromium titanium alloy blank of the complicated shape that obtains after the above-mentioned vacuum sintering is carried out the mechanical workout shaping; And adopt the first layer stainless steel jacket to encapsulate and hot degassing processing; Carry out 900～1200 ℃/150MPa hip treatment again; The goods that obtain behind the hot isostatic pressing are adopted encapsulation of second layer stainless steel jacket and hot degassing processing again, obtain the vanadium chromium titanium alloy hot closed-die forging precast billet that the double-layer stainless steel jacket coats;
C, vanadium chromium titanium alloy hot closed-die forging deformation process: after the process furnace heating, adopt forging equipment to carry out the hot closed-die forging deformation process above-mentioned hot closed-die forging precast billet; The heating and temperature control of vanadium chromium titanium alloy hot closed-die forging deformation process is at 1000 ℃～1200 ℃; Hot closed-die forging deformation deflection is controlled at 40%～80%, and vanadium chromium titanium alloy carries out vacuum annealing after the hot closed-die forging deformation process handles.
In technique scheme, the vanadium chromium titanium alloy blank of complicated shape among the said step a, said complicated shape are meant that being shaped as the cone-shaped body small end is connected the one-piece construction that the back forms with the column end.
In technique scheme, the isostatic cool pressing treatment condition among the said step a are 150～250MPa/30min, and the condition of said vacuum sintering is 1400～1500 ℃/2h.
In technique scheme, it is to carry out at 1000 ℃～1100 ℃ that the vacuum annealing among the said step c is handled.
The present invention invents and adopts the double-layer stainless steel jacket that the complicated shape vanadium chromium titanium alloy blank of powder metallurgic method preparation is coated; Handle through hot closed-die forging deformation process and vacuum annealing again, solved the low problem of vanadium chromium titanium alloy comprehensive mechanical property of complicated shape.The present invention adopts the method for hot closed-die forging can improve the comprehensive mechanical property through the vanadium chromium titanium alloy of powder metallurgic method preparation, its tensile strength sigma
bReach 465MPa～490MPa, ys σ
0.2Reach 340Mpa～380MPa, elongation δ and relative reduction in area Ψ are about 25%～35% and 60.0%～65.0%.
Can find out from each item technical characterictic of the invention described above; Its advantage is: the present invention adopts powder metallurgy process to prepare the vanadium chromium titanium alloy blank of complicated shape vanadium, chromium, titanium fine powder; After the encapsulation of stainless steel jacket, hot degasification and hip treatment; Carry out the encapsulation of second layer stainless steel jacket again, obtain hot closed-die forging deformation process precast billet, carry out the hot closed-die forging deformation process again; Rationally control Heating temperature and deflection in the hot closed-die forging deformation process process, obtain the vanadium chromium titanium alloy blank of the superior complicated shape of mechanical property.When in having guaranteed vanadium chromium titanium alloy hot closed-die forging deformation process, not increasing oxygen, nitrogen content, promote vanadium chromium titanium alloy mechanical property through control hot closed-die forging Heating temperature, deflection and vacuum annealing temperature.This technological method technology is simple, easy to operate, low cost of manufacture, and suitable batch promotes the complicated shape vanadium chromium titanium alloy blank comprehensive mechanical property of powder metallurgic method preparation.
Description of drawings
Below in conjunction with accompanying drawing the present invention is done further explanation:
Fig. 1 is processing technological flow figure of the present invention.
Embodiment
Through embodiment the present invention is done further explanation below in conjunction with accompanying drawing.
Among this embodiment, we adopt following process steps:
1) be 15 μ m～60 μ m vanadium, chromium, titanium fine powder with granularity; 88:6:6 is made into compound according to mass ratio; Adopt the charging of mantle frock and the degasification of complicated shape; And after the 150MPa/30min isostatic cool pressing is handled, adopt 1400 ℃/2h vacuum sintering again, obtain the vanadium chromium titanium alloy blank of complicated shape.
2) the vanadium chromium titanium alloy blank with the complicated shape that obtains after the vacuum sintering adopts dry type turning method that vanadium chromium titanium alloy blank is carried out the mechanical workout shaping; And adopt encapsulation of the first layer stainless steel jacket and hot degassing processing, carry out 1200 ℃/150MPa hip treatment again.The goods that obtain behind the hot isostatic pressing are adopted encapsulation of second layer stainless steel jacket and hot degassing processing again, obtain the vanadium chromium titanium alloy hot closed-die forging precast billet that the double-layer stainless steel jacket coats.
3) after the process furnace heating, adopt forging equipment to carry out the hot closed-die forging deformation process hot closed-die forging precast billet.The heating and temperature control of vanadium chromium titanium alloy hot closed-die forging deformation process is at 1000 ℃, and hot closed-die forging deformation deflection is controlled at 40%, and vanadium chromium titanium alloy carries out 1000 ℃ of vacuum annealings after the hot closed-die forging deformation process handles.
After vanadium chromium titanium alloy blank after the hot closed-die forging deformation process carries out 1000 ℃ of vacuum annealings processing, vanadium chromium titanium alloy comprehensive mechanical property tensile strength sigma
bReach 465MPa, ys σ
0.2Reach 340MPa, elongation δ and relative reduction in area Ψ are about 25% and 60%.
Embodiment 2
Among this embodiment, we adopt following process steps:
1) be 15 μ m～60 μ m vanadium, chromium, titanium fine powder with granularity; 90:5:5 is made into compound according to mass ratio; Adopt the charging of mantle frock and the degasification of complicated shape; And after the 200MPa/30min isostatic cool pressing is handled, adopt 1450 ℃/2h vacuum sintering again, obtain the vanadium chromium titanium alloy blank of complicated shape.
2) the vanadium chromium titanium alloy blank with the complicated shape that obtains after the vacuum sintering adopts dry type turning method that vanadium chromium titanium alloy blank is carried out the mechanical workout shaping; And adopt encapsulation of the first layer stainless steel jacket and hot degassing processing, carry out 1100 ℃/150MPa hip treatment again.The goods that obtain behind the hot isostatic pressing are adopted encapsulation of second layer stainless steel jacket and hot degassing processing again, obtain the vanadium chromium titanium alloy hot closed-die forging precast billet that the double-layer stainless steel jacket coats.
3) after the process furnace heating, adopt forging equipment to carry out the hot closed-die forging deformation process hot closed-die forging precast billet.The heating and temperature control of vanadium chromium titanium alloy hot closed-die forging deformation process is at 1100 ℃, and hot closed-die forging deformation deflection is controlled at 60%, and vanadium chromium titanium alloy carries out 1050 ℃ of vacuum annealings after the hot closed-die forging deformation process handles.
After vanadium chromium titanium alloy blank after the hot closed-die forging deformation process carries out 1050 ℃ of vacuum annealings processing, vanadium chromium titanium alloy comprehensive mechanical property tensile strength sigma
bReach 480MPa, ys σ
0.2Reach 360MPa, elongation δ and relative reduction in area Ψ are about 30% and 63%.
Embodiment 3
Among this embodiment, we adopt following process steps:
1) be 15 μ m～60 μ m vanadium, chromium, titanium fine powder with granularity; 92:4:4 is made into compound according to mass ratio; Adopt the charging of mantle frock and the degasification of complicated shape; And after the 250MPa/30min isostatic cool pressing is handled, adopt 1500 ℃/2h vacuum sintering again, obtain the vanadium chromium titanium alloy blank of complicated shape.
2) the vanadium chromium titanium alloy blank with the complicated shape that obtains after the vacuum sintering adopts dry type turning method that vanadium chromium titanium alloy blank is carried out the mechanical workout shaping; And adopt encapsulation of the first layer stainless steel jacket and hot degassing processing, carry out 900 ℃/150MPa hip treatment again.The goods that obtain behind the hot isostatic pressing are adopted encapsulation of second layer stainless steel jacket and hot degassing processing again, obtain the vanadium chromium titanium alloy hot closed-die forging precast billet that the double-layer stainless steel jacket coats.
3) after the process furnace heating, adopt forging equipment to carry out the hot closed-die forging deformation process hot closed-die forging precast billet.The heating and temperature control of vanadium chromium titanium alloy hot closed-die forging deformation process is at 1200 ℃, and hot closed-die forging deformation deflection is controlled at 80%, and vanadium chromium titanium alloy carries out 1100 ℃ of vacuum annealings after the hot closed-die forging deformation process handles.
After vanadium chromium titanium alloy blank after the hot closed-die forging deformation process carries out 1100 ℃ of vacuum annealings processing, vanadium chromium titanium alloy comprehensive mechanical property tensile strength sigma
bReach 490MPa, ys σ
0.2Reach 380MPa, elongation δ and relative reduction in area Ψ are about 35% and 65%.
Disclosed all characteristics in this specification sheets except mutually exclusive characteristic, all can make up by any way.
Disclosed arbitrary characteristic in this specification sheets (comprising any accessory claim, summary and accompanying drawing) is only if special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, only if special narration, each characteristic is an example in a series of equivalences or the similar characteristics.
Claims (4)
1. the hot closed-die forging technology improves the method for powder metallurgy vanadium chromium titanium alloy comprehensive mechanical property, it is characterized in that comprising the following steps:
A, the preparation of complicated shape vanadium chromium titanium alloy blank: with granularity is 15 μ m～60 μ m vanadium, chromium, titanium fine powder; 88-92:4-6:4-6 is made into compound according to mass ratio; Adopt the charging of mantle frock and the room temperature of complicated shape to vacuumize degasification; Isostatic cool pressing is handled the final vacuum sintering, obtains the vanadium chromium titanium alloy blank of complicated shape;
B, the preparation of vanadium chromium titanium alloy hot closed-die forging precast billet: the vanadium chromium titanium alloy blank of the complicated shape that obtains after the above-mentioned vacuum sintering is carried out the mechanical workout shaping; And adopt the first layer stainless steel jacket to encapsulate and hot degassing processing; Carry out 900～1200 ℃/150MPa hip treatment again; The goods that obtain behind the hot isostatic pressing are adopted encapsulation of second layer stainless steel jacket and hot degassing processing again, obtain the vanadium chromium titanium alloy hot closed-die forging precast billet that the double-layer stainless steel jacket coats;
C, vanadium chromium titanium alloy hot closed-die forging deformation process: after the process furnace heating, adopt forging equipment to carry out the hot closed-die forging deformation process above-mentioned hot closed-die forging precast billet; The heating and temperature control of vanadium chromium titanium alloy hot closed-die forging deformation process is at 1000 ℃～1200 ℃; Hot closed-die forging deformation deflection is controlled at 40%～80%, and vanadium chromium titanium alloy carries out vacuum annealing after the hot closed-die forging deformation process handles.
2. hot closed-die forging technology according to claim 1 improves the method for powder metallurgy vanadium chromium titanium alloy comprehensive mechanical property; The vanadium chromium titanium alloy blank that it is characterized in that complicated shape among the said step a, said complicated shape are meant that being shaped as the cone-shaped body small end is connected the one-piece construction that the back forms with the column end.
3. hot closed-die forging technology according to claim 1 improves the method for powder metallurgy vanadium chromium titanium alloy comprehensive mechanical property; It is characterized in that the isostatic cool pressing treatment condition among the said step a are 150～250MPa/30min, the condition of said vacuum sintering is 1400～1500 ℃/2h.
4. according to the method for claim 1 or 2 or 3 described hot closed-die forging technology raising powder metallurgy vanadium chromium titanium alloy comprehensive mechanical properties, it is characterized in that the vacuum annealing processing among the said step c is to carry out at 1000 ℃～1100 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103009008A (en) * | 2012-12-25 | 2013-04-03 | 中国兵器科学研究院宁波分院 | Manufacturing process of V-Cr-Ti alloy super-hemispherical shell |
| CN104694897A (en) * | 2015-03-31 | 2015-06-10 | 中国工程物理研究院材料研究所 | Graphite surface titanium metallization method and product manufactured with the same |
| CN105154737A (en) * | 2015-08-24 | 2015-12-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium, chrome and titanium alloy plate and preparation method thereof |
| CN109338189A (en) * | 2018-11-19 | 2019-02-15 | 中国兵器科学研究院宁波分院 | A kind of preparation method of vanadium tungsten-titanium alloy spherical shell component |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103009008A (en) * | 2012-12-25 | 2013-04-03 | 中国兵器科学研究院宁波分院 | Manufacturing process of V-Cr-Ti alloy super-hemispherical shell |
| CN104694897A (en) * | 2015-03-31 | 2015-06-10 | 中国工程物理研究院材料研究所 | Graphite surface titanium metallization method and product manufactured with the same |
| CN104694897B (en) * | 2015-03-31 | 2017-07-07 | 中国工程物理研究院材料研究所 | A kind of graphite surface titanium method and its product of preparation |
| CN105154737A (en) * | 2015-08-24 | 2015-12-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium, chrome and titanium alloy plate and preparation method thereof |
| CN109338189A (en) * | 2018-11-19 | 2019-02-15 | 中国兵器科学研究院宁波分院 | A kind of preparation method of vanadium tungsten-titanium alloy spherical shell component |
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Application publication date: 20121114 |