CN105506523A - Method for improving damping property of forged Mn-Cu-based damping alloy - Google Patents
Method for improving damping property of forged Mn-Cu-based damping alloy Download PDFInfo
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- CN105506523A CN105506523A CN201510893405.7A CN201510893405A CN105506523A CN 105506523 A CN105506523 A CN 105506523A CN 201510893405 A CN201510893405 A CN 201510893405A CN 105506523 A CN105506523 A CN 105506523A
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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
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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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
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Abstract
The invention relates to a method for improving the damping property of a forged Mn-Cu-based damping alloy. The method comprises the following steps: conducting the cryogenic treatment on the forged Mn-Cu-based damping alloy after solid-solution treatment and ageing treatment; and placing the forged Mn-Cu-based damping alloy at a room temperature to naturally heat the forged Mn-Cu based damping alloy to the room temperature after cryogenic treatment. In order to obtain more martensitic transformations, the cryogenic treatment is conducted again on the forged Mn-Cu-based damping alloy after heated at the room temperature to the room temperature after cryogenic treatment, the forged Mn-Cu-based damping alloy is placed at the room temperature again to be heated to the room temperature after cryogenic treatment, and so the cryogenic treatment and the heating treatment are repeated once to twice. The method has the advantages that the damping property of the forged Mn-Cu-based damping alloy is further improved, and the Mn-Cu-based damping alloy with a high mechanical property and a high damping property is obtained.
Description
Technical field
The invention belongs to damp alloy material field, be specifically related to a kind of method improving the damping capacity of forging Mn-Cu base damping alloy.
Background technology
Mn-Cu base damping alloy is a kind of twin type damping alloy, and principal feature has good deformation processing characteristics, damping capacity and mechanical property, (<4 × 10 under lower strain amplitude
-4) also have good damping capacity.The aspects such as mechanical transmission, radioactivity detection equipment, motorcycle, naval vessel are applied to, to improve equipment precision and to reduce vibration.The martensitic transformation changed to face-centered tetragonal structure (FCT) from face-centred cubic structure (FCC, γ phase) can be there is in Mn-Cu damping alloy in process of cooling.The damper mechanism of twin type damping alloy is relevant with the coherence twin-plane boundary be deformed into mutually in alloy, under cyclic stress effect, the twin-plane boundary in alloy rearranges motion, produces inelastic strain and makes stress relaxation, thus applied vibration can be dissipated, form damping vibration attenuation.The martensitic transformation changed to face-centered tetragonal structure (FCT) from face-centred cubic structure (FCC, γ phase) can be there is in Mn-Cu damping alloy in the damping heat-transmission treating processes of solid solution, ageing treatment.The damping source of current Mn-Cu alloy is usually owing to the twin-plane boundary etc. that the martensite-γ phase interface formed in martensitic transformation process, martensite bar interface and martensite bar inside are formed due to shear, and the motion under extraneous stress is consumed energy.Therefore raising martensite quantity and the density of martensite interface and inner twin-plane boundary thereof, the mobility at interface are the key points of the damping capacity improving Mn-Cu alloy.
Martensite transformation temperature (the M of Mn-Cu base damping alloy
s) and martensitic transformation end temp (M
f) depend on the homogeneity of the Content and distribution of Mn element in alloy.The segregation of the spinodal decomposition forming component that casting Mn-Cu alloy (general Fe content < 70%) can utilize casting aliquation and ageing treatment to cause, thus make alloy inside form Fu Meng district, make martensitic transformation end temp (M
f) higher, during alloy cool to room temperature, martensitic transformation is comparatively abundant, forms a large amount of microtwinnings and makes it have good damping capacity.But the castability of Mn-Cu alloy is bad, and crystallization range is wide, the defects such as easy appearance is loose, concentrating shrinkage cavity, therefore mechanical property is undesirable.Forging Mn-Cu alloy is due to homogeneous microstructure densification, and intensity is comparatively large, and mechanical property comparatively casting alloy is good, and mechanized equipment has good application prospect.Although the forging Mn-Cu alloy M of Fe content >80%
fhigher than room temperature, after solution treatment, " fcc-fct " martensitic transformation comparatively thoroughly can be there is when cool to room temperature, obtain good damping capacity in point, but due to Mn content high, alloy can be caused to become fragile, unit elongation and impact toughness decreased.In order to ensure the mechanical property of forging Mn-Cu alloy, the Mn-Cu alloy of Fe content (Fe content is about 70%) in normal employing, but the M of such alloy
fpoint is often lower than room temperature, therefore insufficient by martensitic transformation under damping heat-transmission process (solution treatment+ageing treatment) afterwards room temperature condition, also have a certain amount of parent phase to exist afterwards in transformation, cause the limited amount of phase transformation twin, damping capacity is undesirable.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of method improving the damping capacity of forging Mn-Cu base damping alloy is provided, to improve the damping capacity of forging Mn-Cu base damping alloy further, obtain the Mn-Cu base damping alloy having excellent mechanical property and damping capacity concurrently.
The method improving forging Mn-Cu base damping alloy damping capacity of the present invention, forging Mn-Cu base damping alloy through solution treatment and ageing treatment is carried out sub-zero treatment, again Mn-Cu base damping alloy is placed in room temperature environment after sub-zero treatment and is naturally warming up to room temperature.
In aforesaid method, for obtaining more martensitic transformation amount, naturally the forging Mn-Cu base damping alloy being warming up to room temperature at room temperature environment after sub-zero treatment is carried out sub-zero treatment again, is again placed in room temperature environment after sub-zero treatment and is naturally warming up to room temperature, so operate 1 ~ 2 time.
In aforesaid method, described sub-zero treatment is that Mn-Cu base damping alloy is cooled to-160 DEG C ~-60 DEG C from room temperature, and is incubated 0.5 ~ 4.5 hour at this temperature.
In aforesaid method, the component of described forging Mn-Cu base damping alloy and the atomicity percentage composition of each component as follows: Mn is 40.0 ~ 80.0%, Fe is 0.5 ~ 4.5%, Ni is 0.2 ~ 7.0%, Zn be 0 ~ 5.0%, Al is 0 ~ 7.0%, rare earth element is 0 ~ 2.0%, and surplus is Cu.
In aforesaid method, described solution treatment is that insulation terminated rear water cooling 850 ~ 900 DEG C of insulations 1 hour, and described ageing treatment is at 400 ~ 450 DEG C of insulation 4h, after insulation terminates, cools to room temperature with the furnace.
Compared with prior art, the present invention has following beneficial effect:
1, the method for the invention is by carrying out sub-zero treatment by the forging Mn-Cu base damping alloy after solution treatment and ageing treatment, the martensitic transformation amount of alloy is improved greatly, martensite interphase density increases, the energy of sub-zero treatment simultaneously refining alloy crystal grain, make the twin size of martensite inside more tiny, twin-plane boundary density increases, thus the density at damping source interface is added, further increase damping capacity, compare the Mn-Cu base damping alloy not carrying out sub-zero treatment, damping capacity can improve more than 26% (see each embodiment, comparative example).
2, alloy grain and twin-plane boundary due to sub-zero treatment refinement, thus the method for the invention is while raising alloy damping characteristic, the tensile strength also improving alloy (can improve more than 25%, see each embodiment, comparative example) and yield strength, the Mn-Cu base damping alloy having excellent mechanical performances and damping capacity concurrently can be obtained.
3, the method for the invention technique is simple, does not have particular requirement to the melting of Mn-Cu alloy, composition and leading thermal treatment process, easy to utilize.
Accompanying drawing explanation
Fig. 1 is the change curve (when δ be forced vibration strain lag behind the phase angle of stress) of Internal friction tan δ with strain of the Mn-Cu base damping alloy that embodiment 1 and comparative example 1 obtain.
Fig. 2 is the XRD figure spectrum (a is the XRD figure spectrum that embodiment 2 obtains alloy, and b is the XRD figure spectrum that comparative example 2 obtains alloy) of the Mn-Cu base damping alloy that embodiment 2 and comparative example 2 obtain.
Fig. 3 is that 500 times of the Mn-Cu base damping alloy that embodiment 3 and comparative example 3 obtain amplify metallograph (c is embodiment 3 gained alloy, and d is comparative example 3 gained alloy).
Fig. 4 is the stress strain curve of the Mn-Cu base damping alloy that embodiment 5 and comparative example 5 obtain.
The anti-mode of concrete enforcement
Below by embodiment, the method improving the damping capacity of forging Mn-Cu base damping alloy of the present invention is described further.
The damping capacity of following examples and comparative example gained alloy carries out forced-vibration experimentation test (test tan δ is with the change of alternate strain amplitude) by Dynamic Mechanical Analyzer DMA-Q800, and mechanical property is tested by stretching experiment (GBT228.1-2010) and impact experiment (GBT229-2007).
Embodiment 1
By chemical composition be Mn-20.5at%Cu-5.5at%Ni-2.0at%Fe Mn-Cu base damping alloy sample through homogenizing thermal treatment, forging after 850 DEG C insulation 1 hour, by alloy water-cooled (solution treatment) after insulation terminates, then at 435 DEG C, 4 hours are incubated, room temperature (ageing treatment) is cooled to the furnace after insulation terminates, alloy is placed in the insulation 4.5 hours that sub-zero treatment stove is cooled to-160 DEG C, insulation terminates rear taking-up and is placed in room temperature environment and makes alloy naturally be warming up to room temperature again.
Comparative example 1
Alloying constituent is identical with embodiment 1, does not carry out sub-zero treatment, and all the other process are identical with embodiment 1.
Embodiment 1 and comparative example 1 gained alloy, through mechanical property and damping capacity test, the results are shown in Table 1.The tan δ of the Mn-Cu base damping alloy that embodiment 1 and comparative example 1 obtain is shown in Fig. 1 with the change curve of strain.
Table 1.
From Fig. 1 and table 1, after sub-zero treatment, the damping capacity of Mn-Cu base damping alloy increases substantially, and is 1 × 10 in strain
-4time damping capacity improve 35%, as known from Table 1, after sub-zero treatment, Mn-Cu base damping alloy mechanical property significantly improves, and tensile strength improves 25%, and yield strength improves 20%.
Visible, adopt the inventive method to improve damping capacity and the mechanical property of Mn-Cu base damping alloy simultaneously.
Embodiment 2
By chemical composition be Mn-20.5at%Cu-5.5at%Ni-2.0at%Fe Mn-Cu base damping alloy sample through homogenizing thermal treatment, forging after 850 DEG C insulation 1 hour, by alloy water-cooled after insulation terminates, then at 435 DEG C, 4 hours are incubated, room temperature is cooled to the furnace after insulation terminates, alloy is placed in sub-zero treatment stove again and is cooled to-60 DEG C of insulations 0.5 hour, insulation terminates rear taking-up and is placed in room temperature environment and treats that alloy is warming up to room temperature naturally.
Comparative example 2
Alloying constituent is identical with embodiment 2, does not carry out sub-zero treatment, and all the other process are identical with embodiment 2.
Embodiment 2 and comparative example 2 gained alloy, through damping capacity and Mechanics Performance Testing, the results are shown in Table 2.
Table 2.
As known from Table 2, the Mn-Cu base damping alloy after the sub-zero treatment of embodiment 2 gained compares the Mn-Cu base damping alloy of ratio 2, and damping capacity can improve 26%, and mechanical property significantly improves, and tensile strength improves 26%.
XRD test is done to the Mn-Cu base damping alloy that embodiment 2 and comparative example 2 obtain, the results are shown in Figure 2.As can be seen from Figure 2, wherein a is the division situation at embodiment 2 gained alloy mother phase (220) peak, b is the division situation at comparative example 2 gained alloy mother phase (220) peak, after calculating sub-zero treatment, the martensitic transformation amount of Mn-Cu base damping alloy brings up to 77% from 45%, improves about 71%.
Embodiment 3
By chemical composition be Mn-20.5at%Cu-5.5at%Ni-2.0at%Fe-2.1at%Zn-1.5at%Al Mn-Cu base damping alloy sample through homogenizing thermal treatment, forging after 850 DEG C insulation 1 hour, by alloy water-cooled after insulation terminates, then at 435 DEG C, 4 hours are incubated, room temperature is cooled to the furnace after insulation terminates, alloy is placed in sub-zero treatment stove again and is cooled to-100 DEG C of insulations 2 hours, insulation terminates rear taking-up and is placed in room temperature environment and treats that alloy is warming up to room temperature naturally.
Comparative example 3
Alloying constituent is identical with embodiment 3, does not carry out sub-zero treatment, and all the other process are identical with embodiment 3.
Embodiment 3 and comparative example 3 gained alloy, through damping capacity and Mechanics Performance Testing, the results are shown in Table 3.
Table 3.
As known from Table 3, the Mn-Cu base damping alloy after the sub-zero treatment of embodiment 3 gained compares the Mn-Cu base damping alloy of ratio 3, and damping capacity improves 32%, and mechanical property significantly improves, and tensile strength improves 26%.
The structure of the Mn-Cu base damping alloy obtained by metallography microscope sem observation embodiment 3 and comparative example 3, the results are shown in Figure 3.As can be seen from Figure 3, after sub-zero treatment, the feather organization of Mn-Cu base damping alloy is thinner.
Embodiment 4
By chemical composition be Mn-18.0at%Cu-6.5at%Ni-1.0at%Fe-0.8at%Ce Mn-Cu base damping alloy sample through homogenizing thermal treatment, forging after 850 DEG C insulation 1 hour, by alloy water-cooled after insulation terminates, then at 435 DEG C, 4 hours are incubated, room temperature is cooled to the furnace after insulation terminates, alloy is placed in sub-zero treatment stove again and is cooled to-120 DEG C of insulations 1.5 hours, insulation terminates rear taking-up and is placed in room temperature environment and treats that alloy is warming up to room temperature naturally.
Comparative example 4
Alloying constituent is identical with embodiment 4, does not carry out sub-zero treatment, and all the other process are identical with embodiment 4.
Embodiment 4 and comparative example 4 gained alloy, through damping capacity and Mechanics Performance Testing, the results are shown in Table 4.
Table 4.
As known from Table 4, the alloy phase after the sub-zero treatment of embodiment 4 gained improves 30% than the alloy damping characteristic of comparative example 4, and mechanical property significantly improves, and tensile strength improves 27%.
Embodiment 5
Be that the Mn-Cu base damping alloy sample of Mn-20.5at%Cu-5.5at%Ni-2.0at%Fe is through homogenizing thermal treatment by chemical composition, within 1 hour, solution treatment is carried out 850 DEG C of insulations after forging, by alloy water-cooled after solution treatment terminates, then at 435 DEG C, 4 hours are incubated, room temperature is cooled to the furnace after insulation terminates, again alloy is placed in temperature be-100 DEG C sub-zero treatment stove insulation 1.5 hours, insulation terminates rear taking-up and is placed in room temperature environment and makes alloy naturally be warming up to room temperature, again alloy is placed in sub-zero treatment stove and is cooled to-100 DEG C of insulations 1.5 hours, insulation terminates rear taking-up and is placed in room temperature environment and treats that alloy is warming up to room temperature naturally.
Comparative example 5
Alloy sample is identical with embodiment 5, does not carry out sub-zero treatment, and all the other process are identical with embodiment 5.
Embodiment 5 and comparative example 5 gained alloy are through damping capacity and Mechanics Performance Testing, and the results are shown in Table 5, stress strain curve is shown in Fig. 4.
Table 5.
As seen from Table 5, the Mn-Cu base damping alloy after the sub-zero treatment of embodiment 5 gained compares ratio 5 gained Mn-Cu base damping alloy, and damping capacity improves 28%, from table 5 and Fig. 4, mechanical property significantly improves, and the tensile strength of alloy improves 25%, Rp0.2 and improves 20%.
Claims (5)
1. one kind is improved the method for forging Mn-Cu base damping alloy damping capacity, it is characterized in that the forging Mn-Cu base damping alloy through solution treatment and ageing treatment to carry out sub-zero treatment, again Mn-Cu base damping alloy is placed in room temperature environment after sub-zero treatment and is naturally warming up to room temperature.
2. improve the method for forging Mn-Cu base damping alloy damping capacity according to claim 1, the forging Mn-Cu base damping alloy being naturally warming up to room temperature at room temperature environment after sub-zero treatment is it is characterized in that again to carry out sub-zero treatment, again be placed in room temperature environment after sub-zero treatment and be naturally warming up to room temperature, so operate 1 ~ 2 time.
3. according to claim 1 or 2, improve the method for forging Mn-Cu base damping alloy damping capacity, it is characterized in that described sub-zero treatment is that Mn-Cu base damping alloy is cooled to-160 DEG C ~-60 DEG C from room temperature, and be incubated 0.5 ~ 4.5 hour at this temperature.
4. according to claim 1 or 2, improve the method for forging Mn-Cu base damping alloy damping capacity, it is characterized in that the atomicity percentage composition of the component of described forging Mn-Cu base damping alloy and each component is as follows: Mn is 40.0 ~ 80.0%, Fe is 0.5 ~ 4.5%, Ni is 0.2 ~ 7.0%, Zn is 0 ~ 5.0%, Al is 0 ~ 7.0%, and rare earth element is 0 ~ 2.0%, and surplus is Cu.
5. improve the method for forging Mn-Cu base damping alloy damping capacity according to claim 3, it is characterized in that the atomicity percentage composition of the component of described forging Mn-Cu base damping alloy and each component is as follows: Mn is 40.0 ~ 80.0%, Fe is 0.5 ~ 4.5%, Ni is 0.2 ~ 7.0%, Zn is 0 ~ 5.0%, Al is 0 ~ 7.0%, and rare earth element is 0 ~ 2.0%, and surplus is Cu.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109811176A (en) * | 2019-03-25 | 2019-05-28 | 杭州辰卓科技有限公司 | A kind of electron device package high-damping bonding line billon and its technique |
| CN112680587A (en) * | 2020-11-12 | 2021-04-20 | 淮阴工学院 | Method for improving hardness of aluminum-magnesium alloy welding wire |
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| CN103966493A (en) * | 2014-05-09 | 2014-08-06 | 曹帅 | High-damping Mn-Cu based damping alloy and preparing method thereof |
| CN104120314A (en) * | 2014-08-12 | 2014-10-29 | 天津银龙高科新材料研究院有限公司 | High-damping MnCu alloy and powdery metallurgy preparation technology thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109811176A (en) * | 2019-03-25 | 2019-05-28 | 杭州辰卓科技有限公司 | A kind of electron device package high-damping bonding line billon and its technique |
| CN112680587A (en) * | 2020-11-12 | 2021-04-20 | 淮阴工学院 | Method for improving hardness of aluminum-magnesium alloy welding wire |
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