CN110438325A - A kind of heat treatment method promoting Magnesium Alloy in Friction Stir welding line long-time service life - Google Patents
A kind of heat treatment method promoting Magnesium Alloy in Friction Stir welding line long-time service life Download PDFInfo
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- CN110438325A CN110438325A CN201910797238.4A CN201910797238A CN110438325A CN 110438325 A CN110438325 A CN 110438325A CN 201910797238 A CN201910797238 A CN 201910797238A CN 110438325 A CN110438325 A CN 110438325A
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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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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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
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a kind of heat treatment methods for promoting Magnesium Alloy in Friction Stir welding line long-time service life, to the magnesium alloy after solution treatment in 180~280 DEG C of ageing treatments for carrying out 0.5~72h, water quenchings；It is stirred friction welding (FW) in room temperature, revolving speed is 100~1000rpm, and weldering speed is 20~120mm/min；The annealing for carrying out 0.5~10h at 250~350 DEG C to the magnesium alloy after welding is directly cooled to ageing treatment, the water quenching of 100~200 DEG C of 0.5~6h of progress after annealing.The present invention increases distortion of lattice degree, accelerates rate of recrystallization by introducing precipitated phase to magnesium alloy, the magnesium-rare earth or high-alloying magnesium alloy for making difficult crystallization quickly complete recrystallization during agitating friction welds, to improve weld seam yield strength, realize along parallel improvement synchronous with the long-time service life in vertical weld direction.
Description
Technical field
The present invention relates to a kind of heat treatment methods for promoting Magnesium Alloy in Friction Stir welding line long-time service life, specifically
What is involved is a kind of to promote recrystallization speed of the magnesium alloy of difficult crystallization during agitating friction welds by introducing precipitated phase
Rate, so that synchronous improve parallel and vertical weld direction fatigue and creep life.Belong to nonferrous materials processing technique field.
Background technique
Magnesium alloy is had great expectations of the large-scale connector applied in aerospace and bullet train because of its excellent welding performance
On.Wherein, agitating friction soldering set has without heating, being not necessarily to solder, be not necessarily to the advantages of protective gas and energy conservation and environmental protection, therefore, stirs
The magnesium alloy connector for mixing friction welding (FW) preparation has a wide range of applications in aerospace and communications and transportation industry.However, stirring
It mixes friction welding (FW) and prepares molding magnesium-rare earth and high-alloying magnesium alloy, weld strength is far below base material, especially vertical welding
It easily cracks in advance during middle fatigue at low temperatures and the long service of high temperature creep in seam direction.This is because rare earth magnesium
Alloy and high-alloying magnesium alloy contain a large amount of solute atoms, reduce recrystallization speed of magnesium alloy during agitating friction weldering
Rate reduces recrystallization volume fraction, causes the nugget of welded seam area and the heat engine zone of influence can not perfect recrystallization, heat affected area
It is unusual coarsening that crystal grain occurs, it is short to eventually lead to the reduction of weld seam yield strength, fatigue and creep life.It rubs to solve magnesium alloy stirring
Wipe the short problem of welding line long-time service life, the present invention propose previously-introduced precipitation particle increase Recrystallization nucleation point and
Rate of recrystallization, and by the annealing of agitating friction postwelding make heat affected area crystal grain in etc. shaft-like, weld seam made by timeliness
Precipitation strength occurs for region, obtains parallel and vertical weld direction long-time service life Synchronous lifting.
Summary of the invention
The purpose of the present invention is to provide at a kind of heat for promoting Magnesium Alloy in Friction Stir welding line long-time service life
Reason method, this method designs, and long-time that is reasonable, easy to operate, at low cost, high-efficient, can stablizing promotion magnesium alloy weld seam is on active service
Service life.
In order to achieve the above object, a kind of heat for promoting Magnesium Alloy in Friction Stir welding line long-time service life of the present invention
Processing method, comprising:
Increase distortion of lattice degree by introducing precipitated phase to magnesium alloy, accelerate rate of recrystallization, makes difficult crystallization
Magnesium-rare earth or high-alloying magnesium alloy quickly complete recrystallization during agitating friction welds, so that it is strong to improve weld seam surrender
Degree, improves the middle fatigue at low temperatures service life and high temperature creep life of weld seam, specifically includes the following steps:
A. to the magnesium alloy after solution treatment in 180~280 DEG C of ageing treatments for carrying out 0.5~72h, water quenchings；
B. it is stirred friction welding (FW) in room temperature, revolving speed is 100~1000rpm, and weldering speed is 20~120mm/min；
C. the annealing for carrying out 0.5~3h at 250~350 DEG C to the magnesium alloy after welding, is directly cooled to after annealing
The ageing treatment of 100~200 DEG C of 0.5~6h of progress, water quenching.
A kind of heat treatment method for promoting Magnesium Alloy in Friction Stir welding line long-time service life of the present invention, the A
Step aging temp is 200~280 DEG C.
A kind of heat treatment method for improving Magnesium Alloy in Friction Stir welding line resist bending shock resistance of the present invention, it is described
Step B revolving speed is 100~800rpm, and weldering speed is 20~100mm/min.
A kind of heat treatment method for promoting Magnesium Alloy in Friction Stir welding line long-time service life of the present invention, the C
Step annealing temperature is 250~330 DEG C.
A kind of heat treatment method for promoting Magnesium Alloy in Friction Stir welding line long-time service life of the present invention, the C
30 DEG C higher than step A aging temp of step annealing temperature or more.
A kind of heat treatment method for promoting Magnesium Alloy in Friction Stir welding line long-time service life of the present invention, the length
Time service life refers to the creep life within the fatigue life and 200~300 DEG C within the scope of room temperature to 200 DEG C.
A kind of heat treatment method for promoting Magnesium Alloy in Friction Stir welding line long-time service life of the present invention, the length
Time service life promotes the service life Synchronous lifting for referring to parallel and vertical weld direction.
A kind of heat treatment method for promoting Magnesium Alloy in Friction Stir welding line long-time service life of the present invention, the magnesium
Alloy is magnesium-rare earth or high-alloying magnesium alloy, and magnesium-rare earth is selected from GW system or WE system, the choosing of high-alloying magnesium alloy
From AZ80, AZ91, TA83 or ZT64.
A kind of heat treatment method promoting Magnesium Alloy in Friction Stir welding line long-time service life provided by the invention, has
Several big advantages below:
1. being directed to the magnesium-rare earth and high-alloying magnesium alloy of difficult crystallization, the present invention passes through previously-introduced precipitated phase,
Distortion of lattice degree and Recrystallization nucleation particle can be dramatically increased, and utilizes slower revolving speed and weldering speed, promotes agitating friction weldering
The rate of recrystallization of nugget and the heat engine zone of influence and recrystallization degree in the process, form refined crystalline strengthening；Meanwhile precipitation particle can hinder
Hinder the crystal boundary irregular deformation in heat affected area, effectively avoids the abnormal grain growth of heat affected area.
2. the present invention can promote the heat engine zone of influence and heat affected area by the medium temperature short-cycle annealing processing of agitating friction postwelding
Remaining irregular coarse grain boundaries straighten again, form equiax crystal, are conducive to reduce creep strain amount and eliminate welded seam area
Residual stress avoids premature failure when fatigue and creep.
It is precipitated, is formed again 3. the present invention induces weld seam equiax crystal intra-die by the timeliness again of agitating friction postwelding
Precipitation strength reduces nugget, the antifatigue and creep-resistant property gap of the heat engine zone of influence, heat affected area and base material, solves coarse-grain
It damages fatigue life and fine grain damages the contradiction of creep life, realized using mixing crystallite dimension with precipitated phase parallel and vertical
The fatigue and creep life Synchronous lifting of bead direction.
4. the Magnesium Alloy in Friction Stir welding line after processed by the invention, along parallel and vertical weld the middle fatigue at low temperatures longevity
Life can promote 30 times and 20 times or more respectively, can promote 2 times or more along parallel and vertical weld high temperature creep life.
5. the present invention is focused on without changing equipment, the shaft shoulder, capillary and the welding condition of agitating friction weldering to magnesium
The regulation of alloy welded seam area heterogeneous microstructure, technological design is reasonable, process is short, easy to operate, at low cost, high-efficient, can
Applied to Magnesium Alloy in Friction Stir weldering various connection types, such as be vertically connected with, left and right connection, L-type connection or T-type connection.
Specific embodiment
It is intended to further illustrate the present invention with reference to embodiments, is not intended to limit the present invention.
Embodiment 1
The present embodiment is GW123 magnesium alloy using raw material, after solution treatment, at the timeliness that 200 DEG C carry out 60h
Reason, water quenching, are stirred friction welding (FW) in room temperature, revolving speed 200rpm, weldering speed 20mm/min exist to the magnesium alloy after welding
The annealing of 300 DEG C of progress 3h is directly cooled to ageing treatment, the water quenching of 150 DEG C of progress 6h after annealing；To magnesium obtained
Alloy weld seam carries out fatigue and creep life test along parallel and vertical weld direction respectively, wherein fatigue life test temperature
For 150 DEG C, be loaded as 120MPa, creep life test temperature is 250 DEG C, is loaded as 120MPa；As a comparison, at without heat
Reason, the GW123 magnesium alloy weld seam for being directly stirred friction welding (FW) also carry out under similarity condition parallel and vertical weld direction
Fatigue and creep life test.Test result is as shown in table 1.
Table 1
As shown in Table 1, GW123 magnesium alloy weld fatigue after heat treatment is with creep life along parallel and vertical weld side
To being obviously improved.As it can be seen that the long-time that the present invention can be effectively improved magnesium-rare earth stir friction welding seam is on active service
Service life.
Embodiment 2
The present embodiment using raw material be WE43 magnesium alloy, after solution treatment, 180 DEG C carry out 72h ageing treatment,
Water quenching is stirred friction welding (FW), revolving speed 1000rpm, weldering speed 100mm/min, to the magnesium alloy after welding 250 in room temperature
The annealing for DEG C carrying out 3h, is directly cooled to 100 DEG C of the progress ageing treatments of 6h, water quenchings after annealing；Magnesium obtained is closed
Gold solder seam carries out fatigue and creep life along parallel and vertical weld direction respectively and tests, wherein fatigue life test temperature is
Room temperature is loaded as 100MPa, and creep life test temperature is 200 DEG C, is loaded as 150MPa；As a comparison, not thermally treated, straight
Tap into row agitating friction weldering WE43 magnesium alloy weld seam also under similarity condition carry out in parallel and vertical weld direction fatigue with
Creep life test.Test result is as shown in table 2.
Table 2
As shown in Table 2, WE43 magnesium alloy weld fatigue after heat treatment is with creep life along parallel and vertical weld side
To being obviously improved.As it can be seen that the long-time that the present invention can be effectively improved magnesium-rare earth stir friction welding seam is on active service
Service life.
Embodiment 3
The present embodiment is AZ80 magnesium alloy using raw material, after solution treatment, at the timeliness that 280 DEG C carry out 0.5h
Reason, water quenching, are stirred friction welding (FW) in room temperature, revolving speed 800rpm, weldering speed 120mm/min exist to the magnesium alloy after welding
The annealing of 350 DEG C of progress 0.5h is directly cooled to ageing treatment, the water quenching of 200 DEG C of progress 0.5h after annealing；To being obtained
Magnesium alloy weld seam along in parallel and vertical weld direction carries out fatigue respectively and creep life tests, wherein fatigue life tests
Temperature is 200 DEG C, is loaded as 60MPa, and creep life test temperature is 300 DEG C, is loaded as 60MPa；As a comparison, at without heat
Reason, the AZ80 magnesium alloy weld seam for being directly stirred friction welding (FW) also carry out under similarity condition parallel and vertical weld direction tired
Labor and creep life test.Test result is as shown in table 3.
Table 3
As shown in Table 3, AZ80 magnesium alloy weld fatigue after heat treatment is with creep life along parallel and vertical weld side
To being obviously improved.As it can be seen that the present invention can be effectively improved the long-time of high-alloying Magnesium Alloy in Friction Stir welding line
Service life.
Embodiment 4
The present embodiment using raw material be AZ91 magnesium alloy, after solution treatment, 250 DEG C carry out 2h ageing treatment,
Water quenching is stirred friction welding (FW), revolving speed 700rpm, weldering speed 100mm/min, to the magnesium alloy after welding 280 in room temperature
The annealing for DEG C carrying out 1.5h, is directly cooled to 200 DEG C of the progress ageing treatments of 2h, water quenchings after annealing；To magnesium obtained
Alloy weld seam carries out fatigue and creep life test along parallel and vertical weld direction respectively, wherein fatigue life test temperature
For room temperature, it is loaded as 120MPa, creep life test temperature is 250 DEG C, is loaded as 120MPa；As a comparison, not thermally treated,
The AZ91 magnesium alloy weld seam for being directly stirred friction welding (FW) also carries out parallel and vertical weld direction fatigue under similarity condition
It is tested with creep life.Test result is as shown in table 4.
Table 4
As shown in Table 4, AZ91 magnesium alloy weld fatigue after heat treatment is with creep life along parallel and vertical weld side
To being obviously improved.As it can be seen that the present invention can be effectively improved the long-time of high-alloying Magnesium Alloy in Friction Stir welding line
Service life.
Embodiment 5
The present embodiment using raw material be TA83 magnesium alloy, after solution treatment, 230 DEG C carry out 20h ageing treatment,
Water quenching is stirred friction welding (FW), revolving speed 100rpm, weldering speed 40mm/min, to the magnesium alloy after welding at 260 DEG C in room temperature
The annealing for carrying out 2h is directly cooled to ageing treatment, the water quenching of 150 DEG C of progress 3h after annealing；To magnesium alloy obtained
Weld seam carries out fatigue and creep life test along parallel and vertical weld direction respectively, wherein fatigue life test temperature is 150
DEG C, be loaded as 80MPa, creep life test temperature is 240 DEG C, is loaded as 120MPa；As a comparison, not thermally treated, direct
Be stirred the TA83 magnesium alloy weld seam of friction welding (FW) also carried out under similarity condition in parallel and the fatigue in vertical weld direction with it is compacted
Become life test.Test result is as shown in table 5.
Table 5
As shown in Table 5, TA83 magnesium alloy weld fatigue after heat treatment is with creep life along parallel and vertical weld side
To being obviously improved.As it can be seen that the present invention can be effectively improved the long-time of high-alloying Magnesium Alloy in Friction Stir welding line
Service life.
Embodiment 6
The present embodiment using raw material be ZT64 magnesium alloy, after solution treatment, 220 DEG C carry out 48h ageing treatment,
Water quenching is stirred friction welding (FW), revolving speed 300rpm, weldering speed 50mm/min, to the magnesium alloy after welding at 300 DEG C in room temperature
The annealing for carrying out 1h is directly cooled to ageing treatment, the water quenching of 170 DEG C of progress 2.5h after annealing；Magnesium obtained is closed
Gold solder seam carries out fatigue and creep life along parallel and vertical weld direction respectively and tests, wherein fatigue life test temperature is
80 DEG C, be loaded as 100MPa, creep life test temperature is 300 DEG C, is loaded as 100MPa；As a comparison, not thermally treated, straight
Tap into row agitating friction weldering ZT64 magnesium alloy weld seam also under similarity condition carry out in parallel and vertical weld direction fatigue with
Creep life test.Test result is as shown in table 6.
Table 6
As shown in Table 6, ZT64 magnesium alloy weld fatigue after heat treatment is with creep life along parallel and vertical weld side
To being obviously improved.As it can be seen that the present invention can be effectively improved the long-time of high-alloying Magnesium Alloy in Friction Stir welding line
Service life.
Claims (8)
1. a kind of heat treatment method for promoting Magnesium Alloy in Friction Stir welding line long-time service life, it is characterised in that: pass through
To magnesium alloy introduce precipitated phase come increase distortion of lattice degree, accelerate rate of recrystallization, make difficult crystallization magnesium-rare earth or
High-alloying magnesium alloy quickly completes recrystallization during agitating friction welds, to improve weld seam yield strength, improves weld seam
Middle fatigue at low temperatures service life and high temperature creep life, specifically includes the following steps:
A. to the magnesium alloy after solution treatment in 180~280 DEG C of ageing treatments for carrying out 0.5~72h, water quenchings；
B. it is stirred friction welding (FW) in room temperature, revolving speed is 100~1000rpm, and weldering speed is 20~120mm/min；
C. the annealing for carrying out 0.5~3h at 250~350 DEG C to the magnesium alloy after welding, directly it is cooled to 100 after annealing~
The ageing treatment of 200 DEG C of 0.5~6h of progress, water quenching.
2. a kind of heat treatment side for promoting Magnesium Alloy in Friction Stir welding line long-time service life according to claim 1
Method, it is characterised in that: aging temp described in step A is 200~280 DEG C.
3. a kind of heat treatment side for promoting Magnesium Alloy in Friction Stir welding line long-time service life according to claim 1
Method, it is characterised in that: revolving speed described in step B is 100~800rpm, and weldering speed is 20~100mm/min.
4. a kind of heat treatment side for promoting Magnesium Alloy in Friction Stir welding line long-time service life according to claim 1
Method, it is characterised in that: annealing temperature described in step C is 250~330 DEG C.
5. a kind of heat treatment side for promoting Magnesium Alloy in Friction Stir welding line long-time service life according to claim 1
Method, it is characterised in that: 30 DEG C higher than aging temp described in step A of annealing temperature described in step C or more.
6. a kind of heat treatment side for promoting Magnesium Alloy in Friction Stir welding line long-time service life according to claim 1
Method, it is characterised in that: the long-time service life refers to the fatigue life and 200~300 within the scope of room temperature to 200 DEG C
Creep life within the scope of DEG C.
7. a kind of heat treatment side for promoting Magnesium Alloy in Friction Stir welding line long-time service life according to claim 1
Method, it is characterised in that: the long-time service life promotes the service life Synchronous lifting for referring to parallel and vertical weld direction.
8. a kind of heat treatment side for promoting Magnesium Alloy in Friction Stir welding line long-time service life according to claim 1
Method, it is characterised in that: the magnesium alloy be magnesium-rare earth or high-alloying magnesium alloy, and magnesium-rare earth be selected from GW system or
WE system, high-alloying magnesium alloy are selected from AZ80, AZ91, TA83 or ZT64.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113005377A (en) * | 2021-02-19 | 2021-06-22 | 长沙学院 | Processing method for improving discharge performance of magnesium anode |
| CN113186387A (en) * | 2021-04-16 | 2021-07-30 | 上海交通大学 | Heat treatment method for inhibiting abnormal coarsening of crystal grains of Mg-Y-RE alloy repair welding joint |
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| CN113186387B (en) * | 2021-04-16 | 2022-07-26 | 上海交通大学 | Heat treatment method for inhibiting abnormal coarsening of crystal grains of Mg-Y-RE alloy repair welding joint |
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