CN105177476A - Heat treatment method for high-strength large-size aluminum alloy thick-wall ring part with controllable elongation - Google Patents
Heat treatment method for high-strength large-size aluminum alloy thick-wall ring part with controllable elongation Download PDFInfo
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- CN105177476A CN105177476A CN201510716675.0A CN201510716675A CN105177476A CN 105177476 A CN105177476 A CN 105177476A CN 201510716675 A CN201510716675 A CN 201510716675A CN 105177476 A CN105177476 A CN 105177476A
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Abstract
The invention relates to a heat treatment method for an aluminum alloy thick-wall ring part, in particular to a heat treatment method for a high-strength large-size aluminum alloy thick-wall ring part with controllable elongation and aims at solving the problem that a thick-wall ring part is low in alloy strength. The heat treatment method comprises the steps of cutting a 2A14 aluminum alloy thick-wall ring part, preserving the temperature at 490-500 DEG C, conducting quenching treatment and solid solution, and obtaining the aluminum alloy thick-wall ring part; 2, adopting a three-roll mill for conducting hot rolling on the aluminum alloy thick-wall ring part; 3, then conducting cold rolling treatment on the aluminum alloy thick-wall ring part obtained after the hot rolling; 4, conducting aging treatment for 2-5 hours at the temperature of 150-200 DEG C. According to the method, the formation of a theta'' phase is inhibited through a cold deformation method, the aging process is controlled so that the core portion of an aluminum alloy thick-wall ring can have high strength, the tensile strength of the aluminum alloy thick-wall ring part obtained after the heat treatment reaches 480 MPa, the yield strength reaches 460 MPa, and the elongation of the aluminum alloy thick-wall ring part is controllable within a certain range.
Description
Technical field
The present invention relates to a kind of heat treating method of aluminum alloy thick wall ring.
Background technology
2A14 aluminium alloy is structured material conventional in aerospace industry, its intensity is high, forgeability good, heat-resisting, and there is good weldability, be widely used in the field such as aerospace industries, rubber mold production, be widely applied with the large-scale framework, ring etc. that it is made.After the art breading such as alloy is annealed, quenching, timeliness, aluminium alloy will have many excellent serviceabilitys.The strengthening mechanism of 2A14 aluminium alloy makes the equal dissolving of θ, then cool fast, equilibrium phase in alloy has little time to separate out, thus obtain supersaturated solid solution, then ageing treatment is carried out to the alloy of solid solution state, separate out precipitated phase in the alloy in ag(e)ing process, Dispersed precipitate, on matrix, makes alloy be strengthened.But when at present its heavy wall ring being heat-treated, because size is large, ring wall is thick, when quenching, because speed of cooling deficiency easily forms θ, " phase; θ " is formed mutually and takies Cu element in heart portion, and reduction matrix Cu content, suppresses main strengthening phase S ' to be formed mutually, S ' phase content deficiency causes alloy strength to decline, and unit elongation increases.Strength degradation, can cause the supporting capacity of component to decline.Unit elongation increase is then for the situation that some need unblock or depart from, and the increase of unit elongation can strengthen unblock difficulty, increases and impacts, and reduces the safe reliability of system.Therefore, a kind of practicable method is needed to reduce unit elongation to strengthen 2A14 aluminum alloy thick wall ring intensity.
Summary of the invention
The object of the invention is to solve in existing large aluminum alloy heavy wall ring heat treatment process because size is large, ring wall is thick, the θ that heart portion is formed because speed of cooling is not enough when quenching " make S ' phase content decline mutually; and then the problem causing alloy strength lower, and a kind of high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring is provided.
The high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring of the present invention realizes according to the following step:
One, Linear cut is adopted to cut 2A14 aluminum alloy thick wall ring, then chamber type electric resistance furnace is put into, 1.8 ~ 2.5 hours are incubated at the temperature of 490 ~ 500 DEG C, taking-up 2A14 aluminum alloy thick wall ring is transferred to rapidly in the hot water of 50 ~ 70 DEG C and is carried out quench treatment, obtains the aluminum alloy thick wall ring after solution hardening;
Two, three-high mill is adopted to carry out tired passage hot rolling process with the ring inwall of the mode of looping mill rolling to the aluminum alloy thick wall ring after solution hardening, controlling breaking down temperature is 380 ~ 420 DEG C, finishing temperature is 230 ~ 280 DEG C, every time rolling reduction is 30% ~ 40%, and rolling obtains the aluminium alloy wall ring after hot rolling;
Three, the hot water aluminium alloy wall ring after hot rolling being put into 50 ~ 70 DEG C carries out solution hardening, and then controlling distortion amount is 10% ~ 40% carry out Cold ring roll process, obtain cold rolling after Al-alloy parts;
Four, step 3 is obtained cold rolling after Al-alloy parts ageing treatment 2h ~ 5h at the temperature of 150 ~ 200 DEG C, complete the high-strength controlled unit elongation thermal treatment of aluminum alloy thick wall ring.
The present invention adopts the method for cold deformation to form a large amount of dislocation in the alloy, and θ " be homogeneous nucleation mutually; main at empty place forming core, the dislocation that cold deformation produces will absorb a large amount of room, " phase nucleation site of significantly reducing θ, thus the suppression θ " formation of phase; form enough S ' phases when ensureing timeliness, make aluminum alloy thick wall ring heart portion also have sufficiently high intensity, control aging technique; obtain suitable dislocation configuration and super fine organization, improve obdurability further simultaneously.Thus the top layer of large aluminum alloy heavy wall ring can be realized and heart portion has high strength, the tensile strength of the aluminum alloy thick wall ring after thermal treatment is made to reach 480MPa, yield strength reaches 460MPa, unit elongation is 1.5% ~ 3.5%, its unit elongation is controlled within the specific limits, meets carrying simultaneously and unlocks the requirement be separated.
Accompanying drawing explanation
Fig. 1 is the tensile strength graphic representation of 2A14 aluminium alloy under different heat-treat conditions in embodiment, wherein ■ represents 1-5 aluminium alloy wall ring sample, ● represent 6-10 aluminium alloy wall ring sample, ▲ represent 11-15 aluminium alloy wall ring sample, ▼ represents 16-20 aluminium alloy wall ring sample
represent 21-25 aluminium alloy wall ring sample;
Fig. 2 is the yield strength graphic representation of 2A14 aluminium alloy under different heat-treat conditions in embodiment, wherein ■ represents 1-5 aluminium alloy wall ring sample, ● represent 6-10 aluminium alloy wall ring sample, ▲ represent 11-15 aluminium alloy wall ring sample, ▼ represents 16-20 aluminium alloy wall ring sample
represent 21-25 aluminium alloy wall ring sample;
Fig. 3 is the hardness value graphic representation of 2A14 aluminium alloy under different heat-treat conditions in embodiment, wherein ■ represents 1-5 aluminium alloy wall ring sample, ● represent 6-10 aluminium alloy wall ring sample, ▲ represent 11-15 aluminium alloy wall ring sample, ▼ represents 16-20 aluminium alloy wall ring sample
represent 21-25 aluminium alloy wall ring sample;
Fig. 4 is the unit elongation graphic representation of 2A14 aluminium alloy under different heat-treat conditions in embodiment, wherein ■ represents 1-5 aluminium alloy wall ring sample, ● represent 6-10 aluminium alloy wall ring sample, ▲ represent 11-15 aluminium alloy wall ring sample, ▼ represents 16-20 aluminium alloy wall ring sample
represent 21-25 aluminium alloy wall ring sample;
Fig. 5 is the microstructure figure a of the 2A14 aluminum alloy thick wall ring obtained after embodiment two thermal treatment;
Fig. 6 is the microstructure figure b of the 2A14 aluminum alloy thick wall ring obtained after embodiment two thermal treatment.
Embodiment
Embodiment one: the high-strength controlled unit elongation heat treating method of present embodiment large aluminum alloy heavy wall ring is implemented according to the following step:
One, Linear cut is adopted to cut 2A14 aluminum alloy thick wall ring, then chamber type electric resistance furnace is put into, 1.8 ~ 2.5 hours are incubated at the temperature of 490 ~ 500 DEG C, taking-up 2A14 aluminum alloy thick wall ring is transferred to rapidly in the hot water of 50 ~ 70 DEG C and is carried out quench treatment, obtains the aluminum alloy thick wall ring after solution hardening;
Two, three-high mill is adopted to carry out tired passage hot rolling process with the ring inwall of the mode of looping mill rolling to the aluminum alloy thick wall ring after solution hardening, controlling breaking down temperature is 380 ~ 420 DEG C, finishing temperature is 230 ~ 280 DEG C, every time rolling reduction is 30% ~ 40%, and rolling obtains the aluminium alloy wall ring after hot rolling;
Three, the hot water aluminium alloy wall ring after hot rolling being put into 50 ~ 70 DEG C carries out solution hardening, and then controlling distortion amount is 10% ~ 40% carry out Cold ring roll process, obtain cold rolling after Al-alloy parts;
Four, step 3 is obtained cold rolling after Al-alloy parts ageing treatment 2h ~ 5h at the temperature of 150 ~ 200 DEG C, complete the high-strength controlled unit elongation thermal treatment of aluminum alloy thick wall ring.
At the low temperature aging initial stage, there is no in alloy that the content of precipitation or precipitated phase is little, with timeliness time lengthening, define a small amount of precipitated phase Ω phase and S' phase in alloy, Ω phase is along [110]
aldirection separate out, in the form of sheets, S' phase is along [100]
al[010]
aldirection is separated out, and becomes needle-like.Along with the rising of aging temp and the prolongation of aging time, the content of the S' phase separated out in alloy increases and size increases, and Dispersed precipitate in the base, does not observe Ω phase.And at the high-temperature aging initial stage, in dislocation, just starting the S-phase separating out point-like, the S-phase in Dispersed precipitate can hinder the motion of dislocation and improve intensity, and along with the continuation of aging time extends, the S-phase that dislocation is separated out increases and size increases, and dislocation line becomes not obvious.Precipitated phase on crystal boundary mainly S-phase, does not observe obvious pollution freemetallurgy near crystal boundary, and then intensity reduces.
Embodiment two: present embodiment and embodiment one are 190 ~ 210mm unlike the wall thickness of the 2A14 aluminum alloy thick wall ring described in step one.Other step and parameter identical with embodiment one.
Embodiment three: present embodiment and embodiment one or two are 1800 ~ 2000mm unlike the external diameter of the 2A14 aluminum alloy thick wall ring described in step one.Other step and parameter identical with embodiment one or two.
Embodiment four: one of present embodiment and embodiment one to three are incubated 2 hours unlike step one at the temperature of 495 DEG C.Other step and parameter identical with one of embodiment one to three.
Embodiment five: one of present embodiment and embodiment one to four are less than 2 seconds unlike the time of step one 2A14 aluminium alloy bulk quenching transfer.Other step and parameter identical with one of embodiment one to four.
Embodiment six: one of present embodiment and embodiment one to five are 3m/min unlike speed of feed during step 2 hot rolling process.Other step and parameter identical with one of embodiment one to five.
Embodiment seven: the wall thickness of the aluminium alloy wall ring after the hot rolling that one of present embodiment and embodiment one to six obtain unlike step 2 is 120 ~ 135mm.Other step and parameter identical with one of embodiment one to six.
Embodiment eight: one of present embodiment and embodiment one to seven are 25% ~ 40% carry out Cold ring roll process unlike step 3 controlling distortion amount.Other step and parameter identical with one of embodiment one to seven.
Embodiment nine: one of present embodiment and embodiment one to eight are unlike step 4 ageing treatment 2h ~ 3h at the temperature of 170 ~ 190 DEG C.Other step and parameter identical with one of embodiment one to eight.
Embodiment ten: present embodiment and embodiment nine are unlike step 4 ageing treatment 2h at the temperature of 180 DEG C.Other step and parameter identical with embodiment nine.
Comparative example one: the heat treating method of the present embodiment large aluminum alloy heavy wall ring is implemented according to the following step:
One, adopting Linear cut to cut into wall thickness to 2A14 aluminum alloy thick wall ring is 200mm, it is highly the heavy wall ring (external diameter of wall ring is 2010mm) of 150mm, then chamber type electric resistance furnace is put into, 2 hours are incubated at the temperature of 495 DEG C, taking-up 2A14 aluminum alloy thick wall ring is transferred to rapidly in the hot water of 60 DEG C and is carried out quench treatment, obtains the aluminum alloy thick wall ring after solution hardening;
Two, adopt different technical parameters directly Cold ring roll process is carried out to the aluminum alloy thick wall ring after solution hardening, obtain cold rolling after Al-alloy parts (wall thickness is 90 ~ 100mm);
Three, by the Al-alloy parts ageing treatment at different temperatures after cold rolling, aluminum alloy thick wall ring sample is obtained.
The present embodiment obtains aluminium alloy wall ring 1-5 sample and 16-20 sample respectively.
Embodiment one: the high-strength controlled unit elongation heat treating method of the present embodiment large aluminum alloy heavy wall ring realizes according to the following step:
One, adopting Linear cut to cut into wall thickness to 2A14 aluminum alloy thick wall ring is 200mm, it is highly the heavy wall ring (external diameter of wall ring is 2010mm) of 150mm, then chamber type electric resistance furnace is put into, 2 hours are incubated at the temperature of 495 DEG C, taking-up 2A14 aluminum alloy thick wall ring is transferred to rapidly in the hot water of 60 DEG C and is carried out quench treatment, obtains the aluminum alloy thick wall ring after solution hardening;
Two, three-high mill is adopted to carry out tired passage hot rolling process with the ring inwall of the mode of looping mill rolling to the aluminum alloy thick wall ring after solution hardening, controlling breaking down temperature is 400 DEG C, finishing temperature is 250 DEG C, every time rolling reduction is 30% or 40%, and it is aluminium alloy wall ring after the hot rolling of 120 ~ 135mm that rolling obtains wall thickness;
Three, the hot water aluminium alloy wall ring after hot rolling being put into 60 DEG C carries out solution hardening, and then controlling distortion amount is 0% ~ 40% carry out Cold ring roll process respectively, obtain cold rolling after Al-alloy parts;
Four, step 3 is obtained cold rolling after Al-alloy parts ageing treatment different time at different temperatures, complete the high-strength controlled unit elongation thermal treatment of aluminum alloy thick wall ring.
The present embodiment obtains aluminium alloy wall ring 6-15 sample and 21-25 sample respectively.The concrete process of thermal treatment parameter of each sample is shown in Table 1.
Table 1
As can be seen from Figure 1, the tensile strength of 6-10 sample is 460 ~ 480MPa, the tensile strength of 11-15 sample is 420 ~ 495MPa, the tensile strength of 21-25 sample is 460 ~ 490MPa, 6-10 sample, 11-15 sample, the tensile strength of 21-25 sample is generally high than the tensile strength of the alloy of 1-5 sample and 16-20 sample, that is the tensile strength of the cold rolling alloy than direct cold rolling is carried out again through the alloy of hot rolling high, wherein No. 6 samples, No. 11 samples, the tensile strength of No. 21 samples occurs abnormal, because they are that hot rolled plate (without cold-rolling treatment) be have passed through long natural aging, carry out artificial aging again, have impact on its mechanical property.As can be seen from Figure 2, the yield strength of 6-10 sample is 400 ~ 465MPa, the yield strength of 11-15 sample is 330 ~ 455MPa, the yield strength of 21-25 sample is 290 ~ 465MPa, 6-10 sample, 11-15 sample, the yield strength of 21-25 sample is generally high than the yield strength of the alloy of 1-5 sample and 16-20 sample, that is the yield strength of the cold rolling alloy than direct cold rolling is carried out again through the alloy of hot rolling high, at No. 12 samples, No. 14 samples, there is outlier in No. 23 sample places, this is because aging time is too short, strengthening phase in alloy is separated out few.As can be seen from Figure 3, the hardness value of carrying out the alloy of cold rolling and direct cold rolling through the alloy of hot rolling is again more or less the same.As can be seen from Figure 4, the unit elongation of 6-10 sample, 11-15 sample, 21-25 sample generally than 1-5 sample and 16-20 sample high by about 10%.
Embodiment two: the high-strength controlled unit elongation heat treating method of the present embodiment large aluminum alloy heavy wall ring realizes according to the following step:
One, adopting Linear cut to cut into wall thickness to 2A14 aluminum alloy thick wall ring is 200mm, it is highly the heavy wall ring (external diameter of wall ring is 2010mm) of 150mm, then chamber type electric resistance furnace is put into, 2 hours are incubated at the temperature of 495 DEG C, taking-up 2A14 aluminum alloy thick wall ring is transferred to rapidly in the hot water of 60 DEG C and is carried out quench treatment, obtains the aluminum alloy thick wall ring after solution hardening;
Two, three-high mill is adopted to carry out tired passage hot rolling process with the ring inwall of the mode of looping mill rolling to the aluminum alloy thick wall ring after solution hardening, controlling breaking down temperature is 400 DEG C, finishing temperature is 250 DEG C, every time rolling reduction is 30%, hot rolling finish to gauge deflection is 40%, and rolling obtains the aluminium alloy wall ring after 120 ~ 135mm hot rolling;
Three, the hot water aluminium alloy wall ring after hot rolling being put into 60 DEG C carries out solution hardening, and then controlling distortion amount is 40% carry out Cold ring roll process, obtain wall thickness be 90 ~ 100mm cold rolling after Al-alloy parts;
Four, step 3 is obtained cold rolling after Al-alloy parts ageing treatment 2h at the temperature of 180 DEG C, complete the high-strength controlled unit elongation thermal treatment of aluminum alloy thick wall ring.
The microstructure of the 2A14 aluminum alloy thick wall ring that the present embodiment thermal treatment obtains as illustrated in Figures 5 and 6, scientific design cold deformation and ageing treatment can all obtain the tissue with suitable dislocation desity and small and dispersed precipitated phase on the top layer of wall ring and heart portion, this makes the heart portion of heavy wall annular component have higher-strength, the tensile strength of the aluminum alloy thick wall ring that this embodiment obtains is 489Mpa, yield strength is 465MPa, unit elongation: 3.4%, within overall unit elongation is in controllable levels.
Claims (10)
1. the high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring, it is characterized in that realizing according to the following step:
One, Linear cut is adopted to cut 2A14 aluminum alloy thick wall ring, then chamber type electric resistance furnace is put into, 1.8 ~ 2.5 hours are incubated at the temperature of 490 ~ 500 DEG C, taking-up 2A14 aluminum alloy thick wall ring is transferred to rapidly in the hot water of 50 ~ 70 DEG C and is carried out quench treatment, obtains the aluminum alloy thick wall ring after solution hardening;
Two, three-high mill is adopted to carry out tired passage hot rolling process with the ring inwall of the mode of looping mill rolling to the aluminum alloy thick wall ring after solution hardening, controlling breaking down temperature is 380 ~ 420 DEG C, finishing temperature is 230 ~ 280 DEG C, every time rolling reduction is 30% ~ 40%, and rolling obtains the aluminium alloy wall ring after hot rolling;
Three, the hot water aluminium alloy wall ring after hot rolling being put into 50 ~ 70 DEG C carries out solution hardening, and then controlling distortion amount is 10% ~ 40% carry out Cold ring roll process, obtain cold rolling after Al-alloy parts;
Four, step 3 is obtained cold rolling after Al-alloy parts ageing treatment 2h ~ 5h at the temperature of 150 ~ 200 DEG C, complete the high-strength controlled unit elongation thermal treatment of aluminum alloy thick wall ring.
2. the high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring according to claim 1, is characterized in that the wall thickness of the 2A14 aluminum alloy thick wall ring described in step one is 190 ~ 210mm.
3. the high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring according to claim 1, is characterized in that the external diameter of the 2A14 aluminum alloy thick wall ring described in step one is 1800 ~ 2000mm.
4. the high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring according to claim 1, is characterized in that step one is incubated 2 hours at the temperature of 495 DEG C.
5. the high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring according to claim 1, is characterized in that the time of step one 2A14 aluminium alloy bulk quenching transfer is less than 2 seconds.
6. the high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring according to claim 1, speed of feed when it is characterized in that step 2 hot rolling process is 3m/min.
7. the high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring according to claim 1, is characterized in that the wall thickness of the aluminium alloy wall ring after the hot rolling that step 2 obtains is 120 ~ 135mm.
8. the high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring according to claim 1, is characterized in that step 3 controlling distortion amount is 25% ~ 40% carry out Cold ring roll process.
9. the high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring according to claim 1, is characterized in that step 4 ageing treatment 2h ~ 3h at the temperature of 170 ~ 190 DEG C.
10. the high-strength controlled unit elongation heat treating method of large aluminum alloy heavy wall ring according to claim 9, is characterized in that step 4 ageing treatment 2h at the temperature of 180 DEG C.
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