CN104388862B - A kind of full sheet layer heat treatment method containing τ 3 phase γ-TiAl intermetallic compound ingot casting - Google Patents
A kind of full sheet layer heat treatment method containing τ 3 phase γ-TiAl intermetallic compound ingot casting Download PDFInfo
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- CN104388862B CN104388862B CN201410631906.3A CN201410631906A CN104388862B CN 104388862 B CN104388862 B CN 104388862B CN 201410631906 A CN201410631906 A CN 201410631906A CN 104388862 B CN104388862 B CN 104388862B
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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
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
A kind of containing τ3The full sheet layer heat treatment method of phase γ TiAl intermetallic compound ingot casting, it relates to a kind of containing τ3The full sheet layer heat treatment method of phase γ TiAl intermetallic compound ingot casting.Present invention aims to containing τ3The γ TiAl-base alloy of phase, obtains fine uniform complete lamellar structure by heat treatment, and then optimizing tissue improves alloy property.Method: put into after alloy sample loads crucible in heat-treatment furnace and be incubated, be then transferred in the heat-treatment furnace that furnace temperature is 900 DEG C～1000 DEG C, after insulation 30min～50min, cools to room temperature with the furnace, obtains the alloy sample after heat treatment；Alloy sample after heat treatment is made annealing treatment, obtains the lamella colony average grain size uniform complete lamellar structure in 100～200 μm.The present invention is for containing τ3The heat treatment of phase γ TiAl intermetallic compound ingot casting.
Description
Technical field
The present invention relates to a kind of containing τ3The full sheet layer heat treatment method of phase γ-TiAl intermetallic compound ingot casting.
Background technology
γ-TiAl-base alloy is a kind of novel high-temperature structural material, there is the advantages such as high-melting-point, low-density, high elastic modulus and preferable elevated temperature strength, fire retardancy, non-oxidizability, it is a kind of heat-resisting high-temperature structural material of novel light with broad prospect of application it is considered to be one of the aero-engine structural material of future generation of great competition potential.But, tissue and low temperature-room type plasticity that TiAl intermetallic compound is thick limit it and extensively apply.For the problem of TiAl-base alloy temperature-room type plasticity difference, in terms of current present Research, the reason of temperature-room type plasticity difference mainly has: the order of (one) TiAl-base alloy Atom arrangement and interatomic covalent bond binding characteristic；(2) microdeformation mode is less and deformation mechanism complicated；(3) coarse microstructure and interface bond strength are low etc..Result of study shows, its room-temperature mechanical property in the microscopic structure appreciable impact of TiAl-base alloy, and microscopic structure tiny, uniform can make alloy while keeping higher mechanical behavior under high temperature, it is thus achieved that higher room-temperature mechanical property.Recent decades, Chinese scholars has done substantial amounts of exploration and research at tissue and the aspect of performance of TiAl intermetallic compound.Result shows, by adding a certain amount of alloying element, changes the solidification path of alloy, can refine the as-cast structure of γ-TiAl.Containing β phase γ-TiAl-base alloy be exactly profit in this way, by add q.s beta stable element make alloy by traditional L → L+ β → α ... become L → L+ β → β →..., obtain tiny as-cast structure.Found by research Ti-Al-Ni ternary phase diagrams, alloy graining path can also be changed by adding a small amount of alloying element Ni, make alloy by traditional L → L+ β → α ... to become L → L+ β → α+τ3→..., obtains tiny as-cast structure.For containing τ3For the novel γ-TiAl-base alloy of phase, τ3The introducing of phase makes alloy structure have less crystallite dimension (～100 μm), but have impact on the uniformity of tissue the most to a certain extent.The complete lamellar structure how obtaining fine uniform is the key obtaining excellent mechanical performances.
Summary of the invention
Present invention aims to containing τ3γ-the TiAl-base alloy of phase, obtains fine uniform complete lamellar structure by heat treatment, and then optimizing tissue improves alloy property, and provides a kind of containing τ3The full sheet layer heat treatment method of phase γ-TiAl intermetallic compound ingot casting.
One of the present invention contains τ3The full sheet layer heat treatment method of phase γ-TiAl intermetallic compound ingot casting is to sequentially include the following steps:
From a size of Φ 50 × 60mm containing τ3The core of phase γ-TiAl intermetallic compound ingot casting cuts out a size of (10 × 10 × 10) mm～the alloy sample of (20 × 20 × 20) mm, put into after alloy sample is loaded crucible in heat-treatment furnace, 1h～4h it is incubated under conditions of temperature is 1350 DEG C～1400 DEG C, it is then transferred in the heat-treatment furnace that furnace temperature is 900 DEG C～1000 DEG C, after being incubated 30min～50min under conditions of temperature is 900 DEG C～1000 DEG C, cool to room temperature with the furnace, obtain the alloy sample after heat treatment；Alloy sample after heat treatment is made annealing treatment, obtains the lamella colony average grain size uniform complete lamellar structure in 100～200 μm, i.e. complete containing τ3The full sheet layer heat treatment of phase γ-TiAl intermetallic compound ingot casting；Described containing τ3Phase γ-TiAl intermetallic compound ingot casting, by the Ti that each element molar percentage is Al:47%～48%, Nb:2%, Cr:2%, Ni:2%～3% and surplus, is made up of titanium sponge, rafifinal, aluminum niobium intermediate alloy, electrolysis chromium and nickel bean.
The invention has the beneficial effects as follows:
Directly obtained the complete lamellar structure of fine uniform by heat treatment after alloy is smelting in the present invention, the lamella Youth League organization obtained is evenly distributed, size is tiny, not through thermomechanical processing technique thinning microstructure, greatly increase the utilization rate of material, also reduce the processing cost before cast alloy application simultaneously.
Accompanying drawing explanation
Fig. 1 is containing τ3Original back scattering photo before phase γ-TiAl intermetallic compound ingot casting is untreated；
Fig. 2 is the tissue back scattering photo of the alloy sample in embodiment one after heat treatment；
Fig. 3 is the tissue transmission electron micrograph of the alloy sample in embodiment one after heat treatment；
Fig. 4 is the tissue back scattering photo of the alloy sample in embodiment three after heat treatment；
Fig. 5 is the tissue transmission electron micrograph of the alloy sample in embodiment three after heat treatment.
Detailed description of the invention
Detailed description of the invention one: present embodiment one contains τ3The full sheet layer heat treatment method of phase γ-TiAl intermetallic compound ingot casting is to sequentially include the following steps:
From a size of Φ 50 × 60mm containing τ3The core of phase γ-TiAl intermetallic compound ingot casting cuts out a size of (10 × 10 × 10) mm～the alloy sample of (20 × 20 × 20) mm, put into after alloy sample is loaded crucible in heat-treatment furnace, 1h～4h it is incubated under conditions of temperature is 1350 DEG C～1400 DEG C, it is then transferred in the heat-treatment furnace that furnace temperature is 900 DEG C～1000 DEG C, after being incubated 30min～50min under conditions of temperature is 900 DEG C～1000 DEG C, cool to room temperature with the furnace, obtain the alloy sample after heat treatment；Alloy sample after heat treatment is made annealing treatment, obtains the lamella colony average grain size uniform complete lamellar structure in 100～200 μm, i.e. complete containing τ3The full sheet layer heat treatment of phase γ-TiAl intermetallic compound ingot casting；Described containing τ3Phase γ-TiAl intermetallic compound ingot casting, by the Ti that each element molar percentage is Al:47%～48%, Nb:2%, Cr:2%, Ni:2%～3% and surplus, is made up of titanium sponge, rafifinal, aluminum niobium intermediate alloy, electrolysis chromium and nickel bean.
Detailed description of the invention two: present embodiment is unlike detailed description of the invention one: described containing τ3The preparation method of phase γ-TiAl intermetallic compound ingot casting is to sequentially include the following steps:
One, by the Ti that each element molar percentage is Al:47%～48%, Nb:2%, Cr:2%, Ni:2%～3% and surplus, titanium sponge, rafifinal, aluminum niobium intermediate alloy, electrolysis chromium and nickel bean are weighed respectively；
Two, metal step one weighed carries out compound stalk forming by metallic briquette machine, and during briquetting, the most each layer is respectively sponge titanium layer, high-purity aluminium lamination, aluminum niobium intermediate alloy layer, is electrolysed pure layers of chrome, nickel bean layer and sponge titanium layer, obtains metallic briquette；
Three, the metal mold in water jacketed copper crucible induction melting furnace is preheated to 300～400 DEG C, then the metallic briquette that step 2 obtains is put in water jacketed copper crucible induction melting furnace, be evacuated to 1.0 × 10-3～3.0 × 10-3Mbar, then melting 300～400s obtains melt after monitor system being risen to 80～90kW with 10～15kW/min speed, is then cast to by melt in the metal mold of preheating, and furnace cooling, i.e. obtain containing τ3Phase γ-TiAl intermetallic compound ingot casting；
Wherein, the quality purity of titanium sponge is 99.7%, and rafifinal quality purity is 99.99%, and the quality purity of aluminum niobium intermediate alloy is 99.8%, and the quality purity of electrolysis chromium is 99.99%, and the quality purity of nickel bean is 99.99%；Each raw material is commercially available prod.Other are identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment is unlike detailed description of the invention one or two: be incubated 4h under conditions of temperature is 1360 DEG C.Other are identical with detailed description of the invention one or two.
Detailed description of the invention four: present embodiment is unlike one of detailed description of the invention one to three: be incubated 2h under conditions of temperature is 1400 DEG C.Other are identical with one of detailed description of the invention one to three.
Detailed description of the invention five: present embodiment is unlike one of detailed description of the invention one to four: be then transferred in the heat-treatment furnace that furnace temperature is 950 DEG C.Other are identical with one of detailed description of the invention one to four.
By following example checking beneficial effects of the present invention:
Embodiment one: a kind of containing τ3The full sheet layer heat treatment method of phase γ-TiAl intermetallic compound ingot casting is to sequentially include the following steps:
From a size of Φ 50 × 60mm containing τ3The core of phase γ-TiAl intermetallic compound ingot casting cuts out a size of the alloy sample of (10 × 10 × 10) mm, put into after alloy sample is loaded crucible in heat-treatment furnace, 2h it is incubated under conditions of temperature is 1360 DEG C, it is then transferred in the heat-treatment furnace that furnace temperature is 900 DEG C, after being incubated 30min under conditions of temperature is 900 DEG C, cool to room temperature with the furnace, obtain the alloy sample after heat treatment；Alloy sample after heat treatment is made annealing treatment, obtains the lamella colony average grain size uniform complete lamellar structure in 100～200 μm, i.e. complete containing τ3The full sheet layer heat treatment of phase γ-TiAl intermetallic compound ingot casting；Described containing τ3Phase γ-TiAl intermetallic compound ingot casting, by the Ti that each element molar percentage is Al:48%, Nb:2%, Cr:2%, Ni:3% and surplus, is used water jacketed copper crucible vacuum induction skull melting to form by titanium sponge, rafifinal, aluminum niobium intermediate alloy, electrolysis chromium and nickel bean.
Alloy sample after heat treatment is ground to 2000 mesh through abrasive paper for metallograph from 60 mesh, then throws by electropolisher, essence；X-ray diffraction sample is ground to 1000 mesh through washing sand paper from 180 mesh, then uses washes of absolute alcohol surface；Transmission sample is the thin slice of 0.5mm, is ground to 60 μ m-thick with sand paper, then uses double spray thinning technique to prepare.Test result indicate that, alloy sample is incubated 4h at 1360 DEG C, can obtain the most tiny complete lamellar structure after being incubated 30min under conditions of temperature is 900 DEG C.Utilizing scanning electron microscope to be analyzed, Fig. 1 is containing τ3Original back scattering photo before phase γ-TiAl intermetallic compound ingot casting is untreated；Fig. 2 is the tissue back scattering photo of the alloy sample in embodiment one after heat treatment；It can be seen that the alloy sample after heat treatment obtains the complete lamellar structure that contrast is consistent compared with tissue from Fig. 2 with Fig. 1, lamella group average grain size is 150 μm.Utilizing transmission electron microscope to be analyzed, Fig. 3 is the tissue transmission electron micrograph of the alloy sample in embodiment one after heat treatment；The internal lath interface of alloy sample alloy synusia group after heat treatment is straight without precipitate as can be seen from Figure 3.
Embodiment two: a kind of containing τ3The full sheet layer heat treatment method of phase γ-TiAl intermetallic compound ingot casting is to sequentially include the following steps:
From a size of Φ 50 × 60mm containing τ3The core of phase γ-TiAl intermetallic compound ingot casting cuts out a size of the alloy sample of (20 × 20 × 20) mm, put into after alloy sample is loaded crucible in heat-treatment furnace, 4h it is incubated under conditions of temperature is 1360 DEG C, it is then transferred in the heat-treatment furnace that furnace temperature is 950 DEG C, after being incubated 30min under conditions of temperature is 950 DEG C, cool to room temperature with the furnace, obtain the alloy sample after heat treatment；Alloy sample after heat treatment is made annealing treatment, obtains the lamella colony average grain size uniform complete lamellar structure in 100～200 μm, i.e. complete containing τ3The full sheet layer heat treatment of phase γ-TiAl intermetallic compound ingot casting；Described containing τ3Phase γ-TiAl intermetallic compound ingot casting, by the Ti that each element molar percentage is Al:48%, Nb:2%, Cr:2%, Ni:3% and surplus, is used water jacketed copper crucible vacuum induction skull melting to form by titanium sponge, rafifinal, aluminum niobium intermediate alloy, electrolysis chromium and nickel bean.
Test result indicate that, the alloy sample after heat treatment obtains the most tiny complete lamellar structure, and lamella group average grain size is 180 μm.
Embodiment three: the present embodiment is with embodiment one difference: be incubated 1h under conditions of temperature is 1400 DEG C, be then transferred in the heat-treatment furnace that furnace temperature is 950 DEG C, is incubated 30min under conditions of temperature is 950 DEG C.Other are identical with embodiment one.
Fig. 4 is the tissue back scattering photo of the alloy sample in embodiment three after heat treatment；It can be seen that the alloy sample after heat treatment obtains the complete lamellar structure that contrast is consistent compared with tissue from Fig. 4 with Fig. 1, lamella group average grain size is 150 μm.Utilizing transmission electron microscope to be analyzed, Fig. 5 is the tissue transmission electron micrograph of the alloy sample in embodiment three after heat treatment；Alloy sample alloy synusia group interface after heat treatment is smooth without precipitate as can be seen from Figure 5.
Embodiment four: the present embodiment is with embodiment two difference: be incubated 2h under conditions of temperature is 1400 DEG C, be then transferred in the heat-treatment furnace that furnace temperature is 950 DEG C, is incubated 50min under conditions of temperature is 950 DEG C.Other are identical with embodiment two.
Test result indicate that, the alloy sample after heat treatment obtains the most tiny complete lamellar structure, and lamella group average grain size is 200 μm.
Claims (3)
1. one kind contains τ3The full sheet layer heat treatment method of phase γ-TiAl intermetallic compound ingot casting, it is characterised in that containing τ3Phase γ-TiAl
The full sheet layer heat treatment method of intermetallic compound ingot casting is to sequentially include the following steps:
From a size of Φ 50 × 60mm containing τ3The core of phase γ-TiAl intermetallic compound ingot casting cuts out a size of
(10 × 10 × 10) mm～the alloy sample of (20 × 20 × 20) mm, put into after alloy sample loads crucible in heat-treatment furnace, in temperature
Degree is incubated 4h under conditions of being 1360 DEG C, is then transferred in the heat-treatment furnace that furnace temperature is 900 DEG C～1000 DEG C, in temperature is
After being incubated 30min～50min under conditions of 900 DEG C～1000 DEG C, cool to room temperature with the furnace, obtain the alloy sample after heat treatment；
Alloy sample after heat treatment is made annealing treatment, obtains uniformly complete in 100～200 μm of lamella colony average grain size
Lamellar structure, i.e. completes containing τ3The full sheet layer heat treatment of phase γ-TiAl intermetallic compound ingot casting；Described containing τ3Phase γ-TiAl
Intermetallic compound ingot casting is Al:47%～48%, Nb:2%, Cr:2%, Ni:2%～3% by each element molar percentage
With the Ti of surplus, it is made up of titanium sponge, rafifinal, aluminum niobium intermediate alloy, electrolysis chromium and nickel bean.
One the most according to claim 1 contains τ3The full sheet layer heat treatment method of phase γ-TiAl intermetallic compound ingot casting,
It is characterized in that described containing τ3The preparation method of phase γ-TiAl intermetallic compound ingot casting is to sequentially include the following steps:
One, it is Al:47%～48%, Nb:2%, Cr:2%, Ni:2%～3% and surplus by each element molar percentage
Ti, weighs titanium sponge, rafifinal, aluminum niobium intermediate alloy, electrolysis chromium and nickel bean respectively；
Two, metal step one weighed carries out compound stalk forming by metallic briquette machine, and during briquetting, the most each layer is respectively
Sponge titanium layer, high-purity aluminium lamination, aluminum niobium intermediate alloy layer, it is electrolysed pure layers of chrome, nickel bean layer and sponge titanium layer, obtains metallic briquette；
Three, the metal mold in water jacketed copper crucible induction melting furnace is preheated to 300～400 DEG C, then step 2 is obtained
Metallic briquette is put in water jacketed copper crucible induction melting furnace, is evacuated to 1.0 × 10-3～3.0 × 10-3Mbar, then with
After monitor system is risen to 80～90kW by 10～15kW/min speed, melting 300～400s obtains melt, is then cast to by melt
In the metal mold of preheating, and furnace cooling, i.e. obtain containing τ3Phase γ-TiAl intermetallic compound ingot casting；
Wherein, the quality purity of titanium sponge is 99.7%, and rafifinal quality purity is 99.99%, the quality of aluminum niobium intermediate alloy
Purity is 99.8%, and the quality purity of electrolysis chromium is 99.99%, and the quality purity of nickel bean is 99.99%；Each raw material is commercially available product
Product.
One the most according to claim 1 contains τ3The full sheet layer heat treatment method of phase γ-TiAl intermetallic compound ingot casting,
It is characterized in that being then transferred in the heat-treatment furnace that furnace temperature is 950 DEG C.
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| CN104789806B (en) * | 2015-04-02 | 2017-03-01 | 哈尔滨工业大学 | Containing τ3The preparation method of phase γ TiAl intermetallic compound |
| CN105369064A (en) * | 2015-11-02 | 2016-03-02 | 哈尔滨工业大学 | Method for preparing B and Y contained fine grain TiAl alloy |
| CN105220096B (en) * | 2015-11-04 | 2017-03-08 | 哈尔滨工业大学 | A kind of multistep cycle heat treatment method improving conventional cast γ TiAl alloy mechanical property |
| CN105839039B (en) * | 2016-04-26 | 2017-08-25 | 哈尔滨工业大学 | A kind of preparation method of the TiAl alloy sheet material of uniform formation |
| CN106391747B (en) * | 2016-11-28 | 2018-03-16 | 西安诺博尔稀贵金属材料有限公司 | The method that nuclear fuel High-purity Niobium silk is prepared using general industry with niobium bar as raw material |
| CN107904530B (en) * | 2017-12-05 | 2019-06-21 | 北京科技大学 | A kind of heat treatment method of thinning TiAl alloy full sheet layer group size |
| CN113481444B (en) * | 2021-07-05 | 2022-04-08 | 四川大学 | Method for regulating and controlling fine grain structure of peritectic solidification cast TiAl alloy |
| CN114657489B (en) * | 2022-03-16 | 2022-11-25 | 西北工业大学 | Double-temperature heat treatment process for homogenizing microstructure of titanium-aluminum alloy extruded bar |
| CN116179979A (en) * | 2022-12-16 | 2023-05-30 | 中国科学院金属研究所 | Stress relief annealing process suitable for large-size high-temperature titanium alloy curved surface or flat plate member |
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| CN101011705A (en) * | 2007-01-31 | 2007-08-08 | 哈尔滨工业大学 | Method for preparation of Yt-containing TiAl intermetallic compound plate material |
| CN103469135B (en) * | 2013-09-12 | 2015-05-27 | 航天材料及工艺研究所 | Preparation method of high-niobium TiAl intermetallic compound |
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