CN104017979A - Heat treatment method for improving properties of high-strength aluminum alloy stirring friction welding joint - Google Patents
Heat treatment method for improving properties of high-strength aluminum alloy stirring friction welding joint Download PDFInfo
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- CN104017979A CN104017979A CN201410181041.5A CN201410181041A CN104017979A CN 104017979 A CN104017979 A CN 104017979A CN 201410181041 A CN201410181041 A CN 201410181041A CN 104017979 A CN104017979 A CN 104017979A
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Abstract
The invention relates to a heat treatment method for improving properties of a high-strength aluminum alloy stirring friction welding joint, which mainly comprises the following steps: putting a welded high-strength aluminum alloy stirring friction welding workpiece in a deep freezing container containing liquid nitrogen (-196 DEG C), and holding for 12-48 hours; after achieving the holding time, taking the weldment out of the deep freezing container, and standing in air for 1 hour; putting the workpiece subjected to deep freezing in a 120-150 DEG C heat treatment furnace, and holding for 8-16 hours; and after finishing holding, taking the weldment out of the heat treatment furnace, and cooling in air to room temperature. The method can eliminate the softening in the welding joint heat-affected zone, enhances the strength and plasticity of the welding joint, inhibits the problem of low stress cracking along the welding core segregated band, and has the advantages of simple technique, low energy consumption and low production cost.
Description
Technical field the present invention relates to Metal Material Welding field, particularly a kind of heat treating method of welding joint.
When background technology ageing strengthening type aluminium alloy carries out friction Stir, due to the impact of the stirring action in welding process and heat effect, the phenomenons such as that second phase particles can occur is thick, back dissolving, and then cause heat affected zone, the thermomechanical zone of influence or the nugget district of welding joint to have softening problem, the hardness of welding joint cross section is, and " W " type or " V " type distribute, and the existence of these softened zones has affected the mechanical property of welding joint significantly.Therefore, how to adjust structural state and the Hardness Distribution of welding joint by postweld heat treatment, and then improve the mechanical property of welding joint, just become the major issue in friction stir welding field.
In the existing heat treating method of eliminating welding joint softened district, the method using is at first that Welded Joints carries out carrying out artificial aging after high temperature solid solution processing again, but the high-temperature heat treatment Hui Shi nugget district crystal grain generation abnormal growth in this processing method, and then cause joint performance to worsen.For this reason, someone attempts adopting the single postwelding ageing treatment of temperature range in 120～200 DEG C to improve joint performance.But, if adopt the single ageing treatment of higher temperature, can cause heat affected zone to occur overaging problem and produce new softened zone, such as postwelding adopts the method such as local high-temperature gas or flame heating; And adopt the single ageing treatment of temperature on the low side, can promote nugget district second phase particles generation segregation, and then cause welding joint at segregation band generation low stress damage.
Summary of the invention the object of the present invention is to provide a kind of intensity and plasticity that can improve welding joint, is suppressed at the heat treating method that improve high strength alumin ium alloy friction stir welding performance of nugget district along segregation line generation cracking phenomena.The present invention is mainly by deep cooling pre-treatment, makes welding joint produce in advance second phase particles tiny and disperse, then by low temperature aging, the second phase particles of preageing generation is grown up, thereby improves the mechanical property of welding joint.
Heat treating method of the present invention is as follows:
(1) the high strength alumin ium alloy friction stir welding workpiece just having welded is put into the deep cooling container that fills liquid nitrogen (196 DEG C), be incubated after 12-48 hour, weldment is taken out from deep cooling container, and in air, place 1 hour;
(2) subsequently the workpiece of step (1) sub-zero treatment is put into temperature to the heat treatment furnace of 120-150 DEG C, be incubated after 8-16 hour, weldment is taken out from heat treatment furnace, and be cooled to room temperature in air.
In the present invention, the material of welded part is 2000,6000,7000 series high strength aluminium alloys of ageing strengthening (being called again heat-treatable strengthened).
The principle of institute of the present invention foundation:
Thermal treatment process of the present invention is after pre-sub-zero treatment, to carry out low temperature aging processing again.Its principle is: on the one hand, pre-sub-zero treatment alloy Vacancy concentration has remarkably influenced.Due to the interaction of room and copper atom, cause copper atom to be assembled near room, be equivalent to preageing effect, and then in low temperature aging process subsequently, separate out metastable precipitated phase a large amount of, tiny, that disperse distributes.On the other hand, sub-zero treatment is also to the dislocation of having introduced some amount in matrix, and its motion to solute atoms and room has inhibition, thereby has reduced in follow-up low temperature aging is processed copper atom to the segregation tendency of existing segregation line.The comprehensive action of above-mentioned two aspects, has not only improved the tensile property of welding joint on the whole, has also effectively suppressed along the brittle cracking problem of nugget district segregation line simultaneously.
The present invention compared with prior art tool has the following advantages:
(1) intensity and the plasticity of welding joint not only can be improved, the problem of Cracking of nugget district along segregation line can also be suppressed at.
(2) postwelding timeliness thermal treatment temp is low, and welded mother metal tissue and performance are not had a negative impact, and is even also improved to some extent.
(3) postweld heat treatment method is simple to operation, energy efficient, and production cost is low.
Brief description of the drawings
Fig. 1 is the Hardness Distribution graphic representation of the 2024-T3 friction stir welding welding joint thermal treatment front and back of the embodiment of the present invention 1;
Fig. 2 is the comparison diagram of the tensile property of the 2024-T3 friction stir welding welding joint thermal treatment front and back of the embodiment of the present invention 1;
Fig. 3 is the tension fracture position versus figure of the 2024-T3 friction stir welding welding joint thermal treatment front and back of the embodiment of the present invention 1.
Embodiment:
Embodiment 1:
By 200 millimeters of two block lengths, wide 100 millimeters, thickness is the 2024-T3 aluminum alloy plate materials of 2.3 millimeters, carry out friction stir welding welding with docking form along its length, wherein, the speed of mainshaft is 1500 revs/min, stirring tool rate of advance is 200 mm/min, and volume under pressure control is 0.2 millimeter.
Al alloy parts good above-mentioned welding is directly put into the deep cooling container that fills liquid nitrogen (196 DEG C), be incubated 24 hours; After being incubated, Al alloy parts is taken out from deep cooling container, in air, place 1 hour; The above-mentioned Al alloy parts that carried out sub-zero treatment is put into the heat treatment furnace that temperature has reached 120 DEG C, be incubated 8 hours; After being incubated, workpiece is taken out from heat treatment furnace, and air cooling is to room temperature.
The heat treated friction stir welding welding joint of above-mentioned process is carried out measuring and tensile property test perpendicular to the microhardness distribution of welding direction, result as shown in Figure 1, not only eliminated the softened zone in welded heat affecting zone, and entirety improves the hardness of welding joint; As shown in Figure 2, treated joint shows good tensile property, and wherein uniform elongation reaches 80% of mother metal, and intensity and mother metal are suitable, and adopt the intensity of single low temperature aging processing and plasticity the poorest; As shown in Figure 3, joint tension fracture phenomenon when welding joint after heat treatment does not occur single ageing treatment at nugget segregation line place.
Embodiment 2
By 200 millimeters of two block lengths, wide 100 millimeters, thickness is the 6061-T3 aluminum alloy plate materials of 3 millimeters, carry out friction stir welding welding with docking form along its length, wherein, the speed of mainshaft is 1500 revs/min, stirring tool rate of advance is 800 mm/min, and volume under pressure control is 0.2 millimeter.
Al alloy parts good above-mentioned welding is directly put into the deep cooling container that fills liquid nitrogen (196 DEG C), be incubated 12 hours; After being incubated, Al alloy parts is taken out from deep cooling container, in air, place 1 hour; The above-mentioned Al alloy parts that carried out sub-zero treatment is put into the heat treatment furnace that temperature has reached 140 DEG C, be incubated 12 hours; After being incubated, workpiece is taken out from heat treatment furnace, and air cooling is to room temperature.
Embodiment 3
By 200 millimeters of two block lengths, wide 100 millimeters, thickness is the 7050-T7451 aluminum alloy plate materials of 3 millimeters, carry out friction stir welding welding with docking form along its length, wherein, the speed of mainshaft is 1500 revs/min, and stirring tool rate of advance is 1000 mm/min, and volume under pressure control is 0.2 millimeter.
Al alloy parts good above-mentioned welding is directly put into the deep cooling container that fills liquid nitrogen (196 DEG C), be incubated 48 hours; After being incubated, Al alloy parts is taken out from deep cooling container, in air, place 1 hour; The above-mentioned Al alloy parts that carried out sub-zero treatment is put into the heat treatment furnace that temperature has reached 150 DEG C, be incubated 16 hours; After being incubated, workpiece is taken out from heat treatment furnace, and air cooling is to room temperature.
Claims (2)
1. a heat treating method that improves high strength alumin ium alloy friction stir welding performance, is characterized in that:
(1) the high strength alumin ium alloy friction stir welding workpiece just having welded is put into the deep cooling container that fills liquid nitrogen-196 DEG C, be incubated after 12-48 hour, weldment is taken out from deep cooling container, and in air, place 1 hour;
(2) subsequently the workpiece of step (1) sub-zero treatment is put into temperature to the heat treatment furnace of 120-150 DEG C, be incubated after 8-16 hour, weldment is taken out from heat treatment furnace, and be cooled to room temperature in air.
2. according to a kind of heat treating method that improves high strength alumin ium alloy friction stir welding performance described in right 1, it is characterized in that: the material of described welded part is 2000,6000,7000 heat-treatable strengthened series high strength aluminium alloys.
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| CN201410181041.5A CN104017979A (en) | 2014-04-30 | 2014-04-30 | Heat treatment method for improving properties of high-strength aluminum alloy stirring friction welding joint |
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| CN201410181041.5A CN104017979A (en) | 2014-04-30 | 2014-04-30 | Heat treatment method for improving properties of high-strength aluminum alloy stirring friction welding joint |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109848643A (en) * | 2018-11-21 | 2019-06-07 | 江苏理工学院 | A method of improving 7075 Aluminum Alloy Friction Stir Welding head corrosion resistances |
| CN112048689A (en) * | 2020-09-16 | 2020-12-08 | 扬州大学 | Heat treatment method of welding nozzle |
| CN113263279A (en) * | 2021-05-08 | 2021-08-17 | 北京科技大学 | Method for improving performance of heat-treatable strengthened aluminum alloy friction stir welding joint |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103421943A (en) * | 2013-07-23 | 2013-12-04 | 西南交通大学 | Treatment process method for improving performance of 5052 aluminum alloy friction stir welding joint |
| CN103433616A (en) * | 2013-07-25 | 2013-12-11 | 中国科学院理化技术研究所 | Friction stir welding device |
-
2014
- 2014-04-30 CN CN201410181041.5A patent/CN104017979A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103421943A (en) * | 2013-07-23 | 2013-12-04 | 西南交通大学 | Treatment process method for improving performance of 5052 aluminum alloy friction stir welding joint |
| CN103433616A (en) * | 2013-07-25 | 2013-12-11 | 中国科学院理化技术研究所 | Friction stir welding device |
Non-Patent Citations (1)
| Title |
|---|
| JI WANG等: ""Effects of deep cryogenic treatment and low-temperature aging on the mechanical properties of friction-stir-welded joints of 2024-T351 aluminum alloy"", 《MATERIALS SCIENCE & ENGINEERING A》, vol. 609, 29 April 2014 (2014-04-29), pages 147 - 153, XP028854685, DOI: doi:10.1016/j.msea.2014.04.077 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109848643A (en) * | 2018-11-21 | 2019-06-07 | 江苏理工学院 | A method of improving 7075 Aluminum Alloy Friction Stir Welding head corrosion resistances |
| CN112048689A (en) * | 2020-09-16 | 2020-12-08 | 扬州大学 | Heat treatment method of welding nozzle |
| CN113263279A (en) * | 2021-05-08 | 2021-08-17 | 北京科技大学 | Method for improving performance of heat-treatable strengthened aluminum alloy friction stir welding joint |
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Application publication date: 20140903 |