CN103938138B - A kind of sub-recrystallization annealing process improving titanium alloy welding component performance - Google Patents
A kind of sub-recrystallization annealing process improving titanium alloy welding component performance Download PDFInfo
- Publication number
- CN103938138B CN103938138B CN201410136488.0A CN201410136488A CN103938138B CN 103938138 B CN103938138 B CN 103938138B CN 201410136488 A CN201410136488 A CN 201410136488A CN 103938138 B CN103938138 B CN 103938138B
- Authority
- CN
- China
- Prior art keywords
- titanium alloy
- welding
- sub
- recrystallization annealing
- recrystallization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Welding Or Cutting Using Electron Beams (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention relates to a kind of sub-recrystallization annealing process of titanium alloy welding component, postweld heat treatment annealing temperature adopts sub-recrystallization annealing temperature, is recrystallization temperature T
rC50 ~ 80 DEG C below, heating and thermal insulation, impact toughness a
kUvalue, fracture toughness K
iCvalue improves more than 30%, and toughness index obviously improves.Through the titanium alloy welding component of sub-recrystallization annealing postweld heat treatment, not only unrelieved stress is eliminated more abundant, and due to α phase in weld seam precipitation formed braiding structure, component is made to have good over-all properties, thus weldprocedure is applied on the important load bearing structure in the fields such as Aeronautics and Astronautics, for the advantage playing weldprocedure has further established technical foundation.The present invention is applicable to nearly α and alpha-beta titanium alloy.
Description
Technical field
The present invention relates to a kind of raising welding assembly Performance Match degree and impelling strength a
kUwith fracture toughness property K
iC, and fully eliminate the novel thermal process technology-Ya recrystallization annealing process of component inside unrelieved stress, belong to materials science field, be applicable to the postweld heat treatment of nearly α and alpha-beta diphasic titanium alloy component.
Background technology
Welding process conventional at present, no matter be submerged arc welding or argon arc welding, along with the increase of welding assembly thickness, need to add solder at butt welding place, after adding solder, because they are different from welding assembly material and mother metal, also namely joint metallurgically is different from mother metal, the rear unrelieved stress of welding is very large, for this reason normal employing stress relief annealing technique after welding.The welding joint width adding solder is wide, and zone of transition is also large, and joint metallurgy such as chemical composition and mother metal differ greatly, and inhomogeneity is obvious, and weldment cannot reach mother metal character, and supporting capacity reduces, and produces stress concentration; Fatigue strength reduces, and easily causes weldment to break and causes brittle failure.In addition, other performances such as corrosion resistance nature is also deteriorated.Developed electro-beam welding method afterwards.
Electrons leaves welding to be widely used in aerospace, nuclear power, national defence and military project, automobile and electric numerous industry such as electrical instrument because having without the little advantage of welding rod, not oxidizable, good process repeatability and heat distortion amount.Electron beam welding at heavy thickness part as there is outstanding advantage in the welding being greater than 40mm thickness part: weld seam is narrow, depth-to-width ratio is large, Welding Angular Deformation is little, joint crystal grain is thin, joint performance good.Electrons leaves welding can not add solder and directly weld, and weld seam is narrower, and zone of transition is little, but the character owing to welding, still there is unrelieved stress in postwelding.Up to the present, the stress relief annealing technique identical with adding solder is also adopted for the postweld heat treatment of electrons leaves welding both at home and abroad.
According to the experience of domestic and international titanium alloy welding experimental study and engineer applied, do not add the welding joint of solder, if still adopt stress relief annealing, the impact toughness of welding joint and the lower (a of fracture toughness
kUgeneral lower than 30J/cm
2, K
iClower than
), design service requirements can not be met.Contriver is found by research, after stress relief annealing, from welding joint Hardness Distribution, residual stress measurement and microstructure analysis result, under the processing condition of existing stress relief annealing, the weld seam metastable state tissue that is not enough to welding rapid thermal cycles is caused (α ', metastable β) fully decomposes, the oversaturated as-quenched condition of weld seam is not effectively alleviated, welding line joint place hardness, strength level are high, joint toughness is low, and these shortcomings constrain the electrons leaves welding and other application of weldprocedure on the important load-carrying members such as aircraft that do not add solder.Therefore for using this welding process, first to improve at joint performance and particularly making a breakthrough in joint toughness, making joint performance reach design service requirements.
For postweld heat treatment technique, application number 201010187483.2 discloses a kind of weld vacuum heat treatment process of TC18 titanium alloy welding component, solid solution aging technique+ladder-elevating temperature is adopted to solve the problem of strength of joint raising and the deformation of member, its annealing temperature, more than recrystallization temperature, to be mated from the property of welded joint that the present invention solves and to improve joint toughness object different.In addition the document for TC18 titanium alloy belong near β titanium alloy in essence, different with alpha-beta titanium alloy applicable object from the nearly α that the present invention is directed to.
" aero-manufacturing technology ", the article of supplementary issue in 2004 " thermal treatment is on the impact of TA15 titanium alloy EBW joints mechanical property and microtexture " discloses the impact of vacuum welding postheat treatment butt junction performance, from table 3-4, along with thermal anneal temperature improves, the variation tendency that tensile strength, sectional shrinkage, unit elongation are not consistent with impelling strength, but in fluctuation status.Therefore, document result of study can not provide the thinking improving welding joint toughness.
Summary of the invention
In order to solve problems of the prior art, the invention provides a kind of sub-recrystallization annealing process of titanium alloy welding component, the welding residual stress of component can be made to eliminate more abundant, preventing strain cracking; Further, also make component have good comprehensive mechanical property, the application on important load bearing structure can be met.
In order to solve aforementioned technical problem, reaching above-mentioned technique effect, the invention provides following technical scheme:
A sub-recrystallization annealing process for titanium alloy welding component, postweld heat treatment annealing temperature adopts sub-recrystallization annealing temperature, is recrystallization temperature T
rC50 ~ 80 DEG C below, heating and thermal insulation.
Compared with the effect of stress relief annealing system, the present invention makes the impelling strength a of welding joint
kUwith fracture toughness property K
iCimprove more than 30%.This annealing temperature is applicable to all titanium alloy welding modes not adding solder, as argon arc welding, resistance welding, submerged arc welding; Also the electrons leaves welding not adding solder or apply solder is applicable to.
This titanium alloy is nearly α and alpha-beta titanium alloy.
Preferably, recrystallization temperature T
rC50 ~ 80 DEG C below, heating and thermal insulation, air cooling (AC) in electric furnace.
Preferably, if part postwelding cannot carry out machining, then at T
rC50 ~ 80 DEG C below, heating and thermal insulation in vacuum oven, then furnace cooling (FC) or air cooling.
Preferably, vacuum oven vacuum tightness is 1 × 10
-2~ 1 × 10
-4pa.
Compared with prior art, beneficial effect of the present invention is as follows:
The present invention proposes a kind of sub-recrystallization annealing process, the difference of this technique and existing stress relief annealing is, existing stress relief annealing technique, no matter be which type of titanium alloy or which kind of welding process, annealing temperature is generally all at about 600 DEG C, and the present invention selectes annealing process system according to titanium alloy recrystallization temperature.Because recrystallization temperature is relevant with material and deflection thereof, differing materials, recrystallization temperature is different; Commaterial deflection is different, and its recrystallization temperature is also different.Work out postweld heat treatment technique for recrystallization temperature, overcome in the past only by a kind of blindness of temperature stress relief annealing temperature schedule.Therefore, the present invention opens a kind of brand-new technique thinking, according to the different choice annealing temperature of material and deflection, there will be same material due to deflection different, processing parameter selects situation about differing greatly, and this innovation of the present invention just.
It needs to be noted, find through a large amount of experimental studies, for titanium alloy, its about performance obviously different from other conventional metallic substance, such as, plastic improves as unit elongation and relative reduction in area (i.e. sectional shrinkage), can not improve impelling strength and fracture toughness property, but fracture toughness property and plasticity is inversely proportional to.Main purpose of the present invention is the matching problem solving nearly α and alpha-beta titanium alloy welding joint toughness and joint performance, through a large amount of tests study analysis, propose a kind of sub-recrystallization annealing process, utilize " reply softening---oversaturated metastable state tissue (α ', metastable β changes tissue) fully decompose a stress relief " principle, in conjunction with the ins and outs of nearly α and alpha-beta titanium alloy itself, suitable reduction strength of joint, plasticity and toughness are restored, solve the problem that titanium alloy welding component strength matching degree and impact toughness and fracture toughness are low, welding assembly performance is made to reach design service requirements.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Specific embodiment one: intermediate gauge weldment-thickness δ 40mm
1, locate: weld front wire brush and dip in acetone polishing test plate (panel), each of backing plate, then dip in acetone by test plate (panel) and backing plate each wiped clean with silk cloth.Test plate (panel) two ends butt-welded side seam argon arc welding consecutive tracking, welding current is 216A.The long weld and HAZ of 3 place 30mm is carried out between test plate (panel) and backing plate.
2, test piece for welding: electron beam welding machine is middle pressure electron beam welding machine.Operating distance is 190mm, and vacuum degree in vacuum chamber is 1.4 × 10
-3mbar, in electron beam gun, vacuum tightness is 1.1 × 10
-5mbar.
TA15 electro-beam welding process is: according to throat thickness δ 40mm, operating distance D=180mm, welding speed v=300mm/min, acceleration voltage U=55kV, welding current I=300mA, focusing current I
f=2.0A.
3, postweld heat treatment: postweld heat treatment system is in electric furnace or vacuum oven, 830 DEG C × 2.0h is air cooling AC in electric furnace; Be the cold FC of stove in vacuum oven.
Specific embodiment two: heavy thickness weldment-thickness δ 80mm
1, locate: weld front wire brush and dip in acetone polishing test plate (panel), each of backing plate, then dip in acetone by test plate (panel) and backing plate each wiped clean with silk cloth.Test plate (panel) two ends butt-welded side seam argon arc welding consecutive tracking, welding current is 216A.The long weld and HAZ of 3 place 30mm is carried out between test plate (panel) and backing plate.
2, test piece for welding: electron beam welding machine is middle pressure electron beam welding machine.Operating distance is 190mm, and vacuum degree in vacuum chamber is 1.4 × 10
-3mbar, in electron beam gun, vacuum tightness is 1.1 × 10
-5mbar.
TA15 electro-beam welding process is: according to throat thickness δ 80mm, operating distance D=200mm, welding speed v=600mm/min, acceleration voltage U=δ 5kV, welding current I=600mA, focusing current I
f=2.12A.
3, postweld heat treatment: postweld heat treatment system adopts in electric furnace or vacuum oven 840 DEG C × 2.5h, and being air cooling AC in electric furnace, is the cold FC of stove in vacuum oven.
The technology of the present invention is applied in the postweld heat treatment of TA15 electron beam welded joint, for TA15 electron beam welded joint after sub-recrystallization annealing process, not only unrelieved stress is eliminated more abundant, and due to α phase in weld seam precipitation formed braiding structure, joint is made to have good over-all properties, in table 1, table 2.
Table 1 specific embodiment one (intermediate gauge weldment-δ 40mm, recrystallization temperature is 880 DEG C)
Table 2 specific embodiment two (heavy thickness weldment-δ 80mm, recrystallization temperature is 920 DEG C)
In table, σ
bfor tensile strength; σ
p0.2for yield strength; δ
5for unit elongation; Ψ is relative reduction in area; a
kUfor impact toughness; K
iCfor fracture toughness I
As seen from table, become sub-recrystallization annealing from stress relief annealing process, impact toughness a
kUvalue, fracture toughness K
iCvalue improves more than 30%, and toughness index is obviously improved.The sub-recrystallization annealing of postwelding reduces the Strength mis match degree of connector area (comprising weld seam, heat affected zone, mother metal), although therefore weld seam and strength of parent slightly reduce, but the fatigue property of whole welding assembly still remains on same level (within 3%) with postwelding stress relief annealing joint, the present invention has expanded the application of electro-beam welding process on the important load bearing structure of aircraft.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a sub-recrystallization annealing process for titanium alloy welding component, described titanium alloy is nearly α or alpha-beta titanium alloy, it is characterized in that, postweld heat treatment annealing temperature adopts sub-recrystallization annealing temperature, is recrystallization temperature T
rC50 ~ 80 DEG C below, heating and thermal insulation; This sub-recrystallization annealing temperature is applicable to all nearly α or the alpha-beta titanium alloy welding process that do not add solder, is also applicable to the electrons leaves welding applying solder.
2. the sub-recrystallization annealing process of a kind of titanium alloy welding component according to claim 1, is characterized in that, postweld heat treatment is recrystallization temperature T
rC50 ~ 80 DEG C of heating and thermal insulations in electric furnace, air coolings below; Or postweld heat treatment is recrystallization temperature T
rC50 ~ 80 DEG C of heating and thermal insulation, furnace cooling or air cooling in a vacuum furnace below.
3. the sub-recrystallization annealing process of a kind of titanium alloy welding component according to claim 1 and 2, is characterized in that, described do not add solder nearly α or alpha-beta titanium alloy welding process be argon arc welding, resistance welding, submerged arc welding or electrons leaves welding.
4. the sub-recrystallization annealing process of a kind of titanium alloy welding component according to claim 3, it is characterized in that, vacuum oven vacuum tightness is 1 × 10
-2~ 1 × 10
-4pa.
5. the sub-recrystallization annealing process of a kind of titanium alloy welding component according to claim 1 or 2 or 4, is characterized in that, described sub-recrystallization annealing temperature is applicable to the electron beam welding of the heavy thickness titanium alloy component being greater than 40mm.
6. the sub-recrystallization annealing process of a kind of titanium alloy welding component according to claim 5, is characterized in that, compared with stress relief annealing temperature, and the impelling strength a of welding assembly
kUwith fracture toughness property K
iCimprove more than 30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410136488.0A CN103938138B (en) | 2014-04-08 | 2014-04-08 | A kind of sub-recrystallization annealing process improving titanium alloy welding component performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410136488.0A CN103938138B (en) | 2014-04-08 | 2014-04-08 | A kind of sub-recrystallization annealing process improving titanium alloy welding component performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103938138A CN103938138A (en) | 2014-07-23 |
| CN103938138B true CN103938138B (en) | 2016-01-06 |
Family
ID=51186002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410136488.0A Active CN103938138B (en) | 2014-04-08 | 2014-04-08 | A kind of sub-recrystallization annealing process improving titanium alloy welding component performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103938138B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105312758A (en) * | 2015-10-22 | 2016-02-10 | 四川成发航空科技股份有限公司 | Electron beam welding and postweld heat treatment method for aged titanium alloy part |
| CN106670674B (en) * | 2016-12-13 | 2019-06-11 | 西安交通大学 | A method of for determining each zone position in industrially pure titanium joint made by flame welding cross section |
| CN109722615A (en) * | 2019-01-31 | 2019-05-07 | 中国兵器科学研究院宁波分院 | A kind of heat-treatment technology method of titanium alloy welding component |
| CN110568001B (en) * | 2019-08-14 | 2021-09-03 | 武汉科技大学 | Method for determining stress relief annealing temperature of cold-bending thick-wall section steel corner |
| CN113481448B (en) * | 2021-05-20 | 2022-03-08 | 北京航空航天大学 | Titanium alloy member and heat treatment method for titanium alloy member |
| CN114293120B (en) * | 2021-12-30 | 2023-02-07 | 温州大学 | Pulse electric field auxiliary heat treatment method for improving plasticity and toughness of titanium alloy |
| CN115319429B (en) * | 2022-10-17 | 2023-02-03 | 西安稀有金属材料研究院有限公司 | Method for crystallizing both welding seam area and base material area of titanium or titanium alloy welding plate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59226159A (en) * | 1983-06-06 | 1984-12-19 | Nippon Steel Corp | Method for connecting titanium strip |
| CN101838785A (en) * | 2010-06-01 | 2010-09-22 | 中国航空工业集团公司北京航空材料研究院 | Post weld vacuum heat treatment process of TC18 titanium alloy welding component |
-
2014
- 2014-04-08 CN CN201410136488.0A patent/CN103938138B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59226159A (en) * | 1983-06-06 | 1984-12-19 | Nippon Steel Corp | Method for connecting titanium strip |
| CN101838785A (en) * | 2010-06-01 | 2010-09-22 | 中国航空工业集团公司北京航空材料研究院 | Post weld vacuum heat treatment process of TC18 titanium alloy welding component |
Non-Patent Citations (2)
| Title |
|---|
| TA15钛合金高压及中压电子束焊接接头组织性能研究;贺飞;《航空制造技术》;20130831(第16期);第87-89,96页 * |
| 焊后真空热处理对TA15钛合金电子束焊接接头力学性能的影响;李晋炜,毛智勇,胡刚;《航空制造技术》;20041231(第z1期);第195-197页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103938138A (en) | 2014-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103938138B (en) | A kind of sub-recrystallization annealing process improving titanium alloy welding component performance | |
| Huang | Status and improvement of CLAM for nuclear application | |
| CN107009025B (en) | Micro-alloying method for improving toughness of molybdenum and molybdenum alloy fusion welding seam | |
| CN103447672B (en) | Submerged-arc welding technology of big-thickness low-temperature steel plate with yield strength of 690MPa grade | |
| EP2535138B1 (en) | High corrosion resistant equipment for a plant | |
| EP3511432B1 (en) | Softening resistant copper alloy, preparation method, and application thereof | |
| CN103862147B (en) | The silk filling pulsed tungsten argon arc weld(ing) technique of molybdenum-copper and nickel base superalloy | |
| Jebaraj et al. | Mechanical and corrosion behaviour of aluminum alloy 5083 and its weldment for marine applications | |
| CN1238150C (en) | Active compound gradient separation diffusion welding method for titanium aluminium base alloy and steel | |
| CN106086701A (en) | A kind of high strength martensitic PH stainless steel material and preparation method thereof | |
| Russo Spena et al. | Investigation on resistance spot welding of TWIP steel sheets | |
| CN103084714A (en) | Laser preprocessing wire filling tungsten inert gas (TIG) welding method of titanium alloy and pure aluminum sheets | |
| CN109702382B (en) | Welding material suitable for long-time service under high-temperature condition and welding method thereof | |
| CN101988147A (en) | Treatment method for welding zone of high-performance sulfur-resisting drill pipe body and joint | |
| CN104419884B (en) | Application of cryogenic treatment in eliminating residual stress of titanium alloy electron beam welding | |
| Verma et al. | Difficulties and redressal in joining of aluminium alloys by GMA and GTA welding: A review | |
| CN112975101B (en) | Method for diffusion welding of steel by molybdenum-rhenium alloy | |
| CN105108294A (en) | Vacuum electron beam welding method for 30CrMnSiNi2A steel | |
| CN110325313B (en) | Resistance spot welding method | |
| CN103014412A (en) | Composite heat-resistant titanium alloy | |
| CN110643922A (en) | Surface modification method of twin-wire arc spraying and laser remelting | |
| CN101890570A (en) | Electron-beam welding method for aluminum alloy and steel based on intermediate layer isolation control | |
| CN102581467A (en) | Connection method for dissimilar metal constant strength joint of titanium-aluminum base alloy and titanium alloy | |
| Eltai et al. | The effects of gas tungsten arch welding on the corrosion and mechanical properties of AA 6061 T6 | |
| Zhan et al. | Prevention of Crack Formation in Electron-Beam Welded Joints of Dissimilar Metal Compounds (TiNi/Ti6Al4V) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |