CN106048200B - Ti2AlNb based alloy joint made by flame welding heat treatment process - Google Patents
Ti2AlNb based alloy joint made by flame welding heat treatment process Download PDFInfo
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- CN106048200B CN106048200B CN201610694741.3A CN201610694741A CN106048200B CN 106048200 B CN106048200 B CN 106048200B CN 201610694741 A CN201610694741 A CN 201610694741A CN 106048200 B CN106048200 B CN 106048200B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- C—CHEMISTRY; METALLURGY
- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The present invention discloses a kind of Ti2AlNb based alloys joint made by flame welding post weld heat treatment technique, is to the step of Ti2AlNb based alloy joint made by flame weldings progress post weld heat treatment：It is heated up to threephase region (O+ α 2+B2) first, then keeps the temperature uniform to structural transformation, then carries out furnace cooling；Using this threephase region (O+ α 2+B2) high annealing, phase composition, size and crystal boundary pattern are precipitated in joint microstructure to adjust, while eliminating welding point residual stress.The present invention can solve the problems, such as that intermetallic compound Ti2AlNb based alloy fusion welding joint microstructures are uneven and comprehensive mechanical property difference.The post weld heat treatment method of the present invention can improve welding joint structure, connector room temperature and high temperature comprehensive mechanical property be improved, to obtain the welding point of high quality.It is mainly used for heat treatment process after the melting welding of intermetallic compound Ti2AlNb based alloys.
Description
Technical field
The present invention relates to Ti2AlNb based alloy intermetallic compound technical field of heat treatment more particularly to Ti2AlNb bases to close
Golden joint made by flame welding heat treatment process.
Background technology
Ti2AlNb based alloys are also known as O phase alloys, are a kind of lightening fire resistant aviation boats substituting high temperature alloy most foreground
Its structural material.The performance of Ti2AlNb based alloys is very sensitive to organizing, and Thermal Cycle will be such that material structure becomes
Change, the inhomogeneities of tissue and performance is caused in joint.Joint made by flame welding under usual welding condition is by single B2 phases group
At, and crystal grain is coarseer, has higher intensity and certain plasticity at room temperature, but connector generation is serious crisp at high temperature
Change, and the Fracture Characteristics of grain boundary fracture occurs.Many aerospace parts continuous work at high temperature, under high temperature long duration of action,
The tissue and performance of weld seam will deteriorate.Therefore, the welding point for obtaining high quality is that alloy engineering application is urgently to be resolved hurrily
Problem.The post weld heat treatment technique, can improve welding joint structure, effectively the room temperature and elevated temperature strength of adjusting connector and extension
Rate meets engineering application to obtain the welding point of high quality.It is mainly used for intermetallic compound Ti2AlNb based alloys
Heat treatment process after melting welding.
Invention content
It is an object of the invention to overcome the shortage of prior art, provide a kind of in the conjunction of intermetallic compound Ti2AlNb bases
Heat treatment process after the melting welding of gold, welding joint structure is uneven after capable of solving Ti2AlNb based alloy melting welding, high-temp plastic
Difference, comprehensive mechanical property are unsatisfactory for engineering application.
A kind of Ti2AlNb based alloys joint made by flame welding post weld heat treatment technique of the present invention, to Ti2AlNb based alloy fusion weldings
Head carries out post weld heat treatment step：Be heated up to threephase region (O+ α 2+B2) first, then keep the temperature it is uniform to structural transformation, then into
Row furnace cooling；Using this threephase region (O+ α 2+B2) high annealing, phase composition, size and crystal boundary are precipitated in joint microstructure to adjust
Pattern, while eliminating welding point residual stress.
It is preferred that the temperature for being heated up to threephase region (O+ α 2+B2) is 1000 DEG C.
It is preferred that soaking time is 2 hours.
Intermetallic compound Ti2AlNb based alloys joint made by flame welding post weld heat treatment technique provided in an embodiment of the present invention, is adopted
It is more than 910MPa with the fusion welds connector room temperature tensile strength of mechanical property of the process, yield strength is more than 710MPa,
Elongation percentage is more than 8%, and 650 DEG C of mechanical behavior under high temperature tensile strength are more than 690MPa, and yield strength is more than 540MPa, and elongation percentage is big
In 16%, room temperature and high-temp plastic significantly improve, and obtain the welding point of high quality.
Description of the drawings
Postwelding aging strengthening model heating temperature is to weld seam organization chart under the conditions of Fig. 1 is 800 DEG C/2h.
Postwelding aging strengthening model heating temperature is to weld seam organization chart under the conditions of Fig. 2 is 850 DEG C/2h.
Postwelding aging strengthening model heating temperature is to weld seam organization chart under the conditions of Fig. 3 is 900 DEG C/2h.
Postwelding aging strengthening model heating temperature is to weld seam organization chart under the conditions of Fig. 4 is 980 DEG C/2h.
Postwelding aging strengthening model heating temperature is to weld seam organization chart under the conditions of Fig. 5 is 1000 DEG C/2h.
Specific implementation mode
Specific embodiments of the present invention are described in detail below in conjunction with attached drawing.In the following description, for solution
Purpose and not restrictive is released, elaborates detail, to help to be apparent from the present invention.However, to people in the art
It is readily apparent that the present invention can also be put into practice in the other embodiments departing from these details for member.
The present inventor passes through test of many times, conscientiously studies, compares repeatedly, has obtained highly preferred embodiment of the present invention.
The structure property that inventor has studied postwelding aging strengthening model Welded Joints first influences：
Since Ti2AlNb Alloy by Laser weld seams are organized as coarse B2 phases, mechanical property is poor, it is therefore desirable to carry out postwelding
Heat treatment makes Ti2AlNb alloy seam organizations be improved.According to the stabilization phasor of Ti2AlNb alloys, select in B2+O two-phases
Region aging is heat-treated, to obtain comprehensive mechanical property preferably seam organization, this test parameters selection such as the following table 1：
1 postwelding aging strengthening model parameter selection of table
Under this condition, influence of the post weld heat treatment to seam organization：
It is metastable that seam organization, which is the B2 phases formed under the conditions of rapid cooling, when not being heat-treated.Fig. 1,2,3 are postwelding timeliness
It is heat-treated the influence to tissue.By 800~900 DEG C of postwelding aging strengthening models, since temperature is in B2+O phase regions, metastable B2
Inversion of phases is O phases.A large amount of O phases synusia has been precipitated in B2 phase crystal grain.As aging temp increases, O phases increase, O phase-plate bar rules
Very little increase, O phases are with net distribution in matrix B2 phases.2. influence of the post weld heat treatment to tensile property
Table 2 and table 3 are Ti2AlNb alloys postwelding aging strengthening model rear joints in room temperature and 650 DEG C of high temperature tensile properties, can
To find out, aging strengthening model rear joint has good tensile property.The welding point not being heat-treated is compared, and room temperature is drawn
It is little to stretch Strength Changes, plasticity is promoted, and the more apparent promotion of the intensity of drawing by high temperature and plasticity.It is welded by 800 DEG C -900 DEG C
It is heat-treated in .B2 phases afterwards and a large amount of 0 phase sub-layers piece has been precipitated, invigoration effect is played to weld seam.650 DEG C of drawing by high temperature processes
In, extension of the dislocation in weld seam is stopped that causes the plug product of dislocation near synusia by 0 phase sub-layers piece, while also making
Plastic deformation becomes difficult, and crack propagation is slow.Tensile strength increases, and the elongation percentage of weld seam also improves.O phases are in matrix B2 phases
Distribution, quantity, the size of O phases and pattern all have an impact tensile property, after 850 DEG C of heat treatments, the contents of O phases, size and point
Cloth is more conducive to the raising of performance.
2 Ti2AlNb alloy postwelding aging strengthening model room temperature tensile properties of table
3 Ti2AlNb alloy postweldings 650 DEG C of high temperature tensile properties of aging strengthening model of table
The structure property that inventor then has studied postwelding high annealing heat treatment Welded Joints influences：
Welding point passes through postwelding aging strengthening model, and the improved combination properties unobvious of connector, mainly plasticity improve not
It is more.According to the stabilization phasor of Ti2AlNb alloys, selection carries out in the solid solubility temperature section threephase region (α 2+B2+O) at high annealing
Reason, concrete technology are shown in Table 4.
4 postwelding aging strengthening model parameter selection of table
Influence of the postwelding high annealing to seam organization
Fig. 4,5 give the seam organization that postwelding high annealing is heat-treated different temperatures.It is transgranular to have big take measurements more slightly
Big O phase laths, have part to run through crystal boundary, and crystal boundary is discontinuous.This is because tiny O is continuously precipitated in 2 phases of matrix B2/ α
Phase constitution, the O phases being first precipitated gradually are grown up during Slow cooling, are formed in continuous cooling process so various sizes of
O phase constitutions, what is be first precipitated is more coarse.
Influence of the postwelding high annealing to tensile property：
The room temperature and 650 DEG C of drawing by high temperature of Ti2AlNb alloy postwelding high annealings heat treatment is set forth in table 5 and table 6
Performance, 1000 DEG C/2h/ furnace coolings heat treatment after welding point comprehensive mechanical property it is optimal, especially plasticity be improved significantly.
Table 7 gives tensile property of the 1000/2h/ furnace coolings with the base material of stove, after comparison shows the heat treatment of 1000/2h/ furnace coolings, weld seam
Mechanical property it is suitable with the base material after annealing.On the one hand the improvement of welding point comprehensive performance is that lath is thick, can be across crystalline substance
Boundary breaks the continuous of crystal boundary, improves grain-boundary strength, prevents the extension of crackle；On the other hand being high annealing reduces base material
Intensity, the tensile strength of connector are more than the yield strength of base material, are also conducive to the raising of connector plasticity.Comprehensive two aspect reasons, connect
Head intensity can be maintained at higher level, while plasticity is improved significantly.
5 Ti2AlNb alloy postwelding high annealings of table are heat-treated room temperature tensile properties
6 Ti2AlNb alloy postwelding high annealings of table are heat-treated 650 DEG C of high temperature tensile properties
Tensile property tensile property of the 7 1000/2h/ furnace coolings of table with the base material of stove
Inventor's final choice post weld heat treatment uses threephase region (O+ α 2+B2) high annealing, adjusts and is analysed in joint microstructure
Go out phase composition, size and crystal boundary pattern etc., while eliminating welding point residual stress；
Heat treatment process after Ti2AlNb based alloy melting welding, heat treatment process flow：2 hours are kept the temperature at 1000 DEG C, stove
It is cold.
Its operation principle is：Joint made by flame welding is warmed to 1000 DEG C of heat preservation 2h, 1000 DEG C of O+ α 2+B2 three-phases for entering alloy
Area, close to α 2+B2 two-phase sections, heat preservation 2h structural transformations are uniform at high temperature, and discontinuous α 2 is precipitated in B2 phase matrix grain boundaries
Phase, crystal boundary become thinner, interrupted shape crystal boundary are presented；Then during furnace cooling, (970-1000 DEG C) O+ α 2+B2 three-phases are first passed through
O phase large strips have been precipitated in grain boundaries and transgranular subregion in area, with being cooled to 970 DEG C or less start that O phase small strips are precipitated.
Crystal boundary is unintelligible or makes the when of stretching that grain boundary fracture is less likely to occur in interrupted shape, reduces brittle failure tendency；Coarse O phase laths
The resistance bigger of the double lath tissue On Crack Propagation of the small O phase laths of refinement, after forcing connector that more plastic deformations occur
Just it is broken.And furnace cooling cooling rate is slow, fully eliminates welding residual stress, and rapid cooling is avoided to generate micro-flaw.Therefore it passes through
Tissue after 1000 DEG C of threephase region heat preservation 2h furnace coolings can improve the plasticity of welding point, obtain of more preferably organization and performance
Match.
Intermetallic compound Ti2AlNb based alloys joint made by flame welding post weld heat treatment technique provided in an embodiment of the present invention, is adopted
It is more than 910MPa with the fusion welds connector room temperature tensile strength of mechanical property of the process, yield strength is more than 710MPa,
Elongation percentage is more than 8%, and 650 DEG C of mechanical behavior under high temperature tensile strength are more than 690MPa, and yield strength is more than 540MPa, and elongation percentage is big
In 16%, room temperature and high-temp plastic significantly improve, and obtain the welding point of high quality.
The many features and advantage of these embodiments are clear according to the detailed description, therefore appended claims are intended to
Cover all these feature and advantage of these embodiments fallen into its true spirit and range.Further, since this field
Technical staff is readily apparent that many modifications and changes, therefore is not meant to the embodiment of the present invention being limited to illustrated and description essence
Really structurally and operationally, but all suitable modifications and the equivalent fallen within the scope of its can be covered.
Unspecified part of the present invention is known to the skilled person technology.
Claims (2)
1. a kind of Ti2AlNb based alloys joint made by flame welding heat treatment process, it is characterised in that：
Carrying out post weld heat treatment step to Ti2AlNb based alloy joint made by flame weldings is：It is heated up to the temperature of threephase region (O+ α 2+B2) first
1000 DEG C of degree, then keeps the temperature uniform to structural transformation, then carries out furnace cooling；Using this threephase region (O+ α 2+B2) high annealing, with
It adjusts and phase composition, size and crystal boundary pattern is precipitated in joint microstructure, while eliminating welding point residual stress.
2. Ti2AlNb based alloys joint made by flame welding heat treatment process according to claim 1, it is characterised in that：Soaking time
It is 2 hours.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109332693A (en) * | 2018-11-08 | 2019-02-15 | 有研工程技术研究院有限公司 | A kind of three-phase Ti of laser gain material manufacture2The heat treatment process of AlNb based alloy |
| CN111636042B (en) * | 2020-06-12 | 2021-05-18 | 无锡派克新材料科技股份有限公司 | Method for improving malleability of intermetallic compound alloy |
| CN112050978B (en) * | 2020-08-28 | 2021-12-24 | 中国航发北京航空材料研究院 | X-ray residual stress testing method for Ti2AlNb alloy for case |
| CN112063945B (en) * | 2020-08-28 | 2021-12-10 | 中国科学院金属研究所 | Improve Ti2Heat treatment process for lasting and creep property of AlNb-based alloy |
| CN112410698B (en) * | 2020-11-03 | 2021-11-02 | 中国航发北京航空材料研究院 | Three-phase Ti2AlNb alloy multilayer structure uniformity control method |
| CN114645230A (en) * | 2020-12-18 | 2022-06-21 | 中国科学院金属研究所 | Powder Ti capable of avoiding medium-temperature low plasticity2AlNb alloy member heat treatment process |
| CN113584294B (en) * | 2021-06-25 | 2023-03-14 | 西安热工研究院有限公司 | Post-weld stress relief treatment method for precipitation-strengthened high-temperature alloy |
| CN113462997B (en) * | 2021-06-30 | 2022-08-02 | 中国航发动力股份有限公司 | Heat treatment method for improving weld performance after electron beam welding |
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| US7413620B2 (en) * | 2002-11-20 | 2008-08-19 | General Electric Company | Electron beam welding to join gamma titanium aluminide articles |
| CN101966622A (en) * | 2010-04-27 | 2011-02-09 | 中国运载火箭技术研究院 | Laser welding and postweld heat treatment method for Tisub3/subAl-based alloy |
| CN104233141A (en) * | 2013-06-06 | 2014-12-24 | 中国科学院金属研究所 | Annealing heat treatment process for eliminating stress after electronic beam welding of Ti2AlNb-based alloy |
| CN104878331A (en) * | 2015-06-30 | 2015-09-02 | 北京航空航天大学 | Postweld heat treatment technology for titanium alloy welded joint |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7413620B2 (en) * | 2002-11-20 | 2008-08-19 | General Electric Company | Electron beam welding to join gamma titanium aluminide articles |
| CN101966622A (en) * | 2010-04-27 | 2011-02-09 | 中国运载火箭技术研究院 | Laser welding and postweld heat treatment method for Tisub3/subAl-based alloy |
| CN104233141A (en) * | 2013-06-06 | 2014-12-24 | 中国科学院金属研究所 | Annealing heat treatment process for eliminating stress after electronic beam welding of Ti2AlNb-based alloy |
| CN104878331A (en) * | 2015-06-30 | 2015-09-02 | 北京航空航天大学 | Postweld heat treatment technology for titanium alloy welded joint |
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