CN102676748A - Metal material softening annealing treatment method - Google Patents
Metal material softening annealing treatment method Download PDFInfo
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- CN102676748A CN102676748A CN2012101704737A CN201210170473A CN102676748A CN 102676748 A CN102676748 A CN 102676748A CN 2012101704737 A CN2012101704737 A CN 2012101704737A CN 201210170473 A CN201210170473 A CN 201210170473A CN 102676748 A CN102676748 A CN 102676748A
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Abstract
The invention relates to a softening annealing process before cold machining of metal material. The metal material softening annealing treatment method has the characteristic that the method comprises the following steps: 1) firstly arranging a magnetic field generating device outside a ceramic heating furnace, arranging the metal material to be processed in the ceramic heating furnace to be heated, heating the metal material to be processed to 300-450 DEG C, and preserving heat for 30-60 min; and then 2) starting the magnetic field generating device to treat the metal material. The ranges of choice of magnetic parameters of the magnetic field generating device are that the magnetic induction strength is 1.8-2.2T, the magnetic field frequency is 0.1-20Hz, and the magnetic treatment time is 2-600s; and finally the metal material is furnace-cooled or air-cooled to the room temperature. According to the method, the softening annealing temperature can be reduced, and the annealing time is shortened. The phenomena of deformation, oxidation, burning loss of partial elements and the like caused by overhigh temperature are avoided, and obvious energy saving and emission reduction effects are achieved.
Description
Technical field
The present invention relates to the preceding softening annealing process of metallic substance cold working.
Background technology
When metallic substance below recrystallization temperature viscous deformation takes place,, complete a business transaction aggravation each other during dislocation motion because the density of dislocation constantly increases; Produce obstacles such as dislocation pileup group, jog, entangled web, hinder the further motion of dislocation, cause the increase of resistance to deformation; Make the intensity and the hardness of metal raise; Plasticity and toughness reduce, so that forfeiture continuation deformation ability, and this phenomenon is claimed work hardening (or peening).In the actual production, before further cold working, must adopt softening annealing process to eliminate this work hardening phenomenon to material.
Yet conventional softening annealing and process for cooling require very strict.When utilizing Spheroidizing Annealing to eliminate work hardening, temperature is too high or soaking time is excessive, and the nodularization core will be reduced, and nodularization is incomplete; Too fast or the low formation flaky carbide that then is prone to of isothermal temperature of speed of cooling makes hardness higher.The more important thing is; Conventional softening annealing temperature higher (for example, the recrystallization annealing temperature of general steel is greatly between 650～750 ℃) is a series of disadvantageous effects such as distortion is big except that bringing, oxidation and alloying element scaling loss; Also consume mass energy, be unfavorable for save energy and environment protection.
Microtexture form and the mechanical property of utilizing magnetic field to change ferromagnetic substance are a kind of materials processed treatment processs that development in recent years is got up.Research shows that periodically variable magnetic field can cause mangneto plastic deformation phenomenon, changes material hardness, and reduces unrelieved stress to a certain extent.
When on common metal anneal of material technology basis, being aided with periodically variable magnetic field, just recrystallize can take place about 300～550 ℃.This be because; Size or direction become periodically variable foreign field to generate an electromagnetic field in Metallic Solids inside; Its energy in the Metallic Solids storage inside, can be accelerated the disappearance of intracrystalline dislocation with certain form, reduces the bound energy between dislocation-obstacle; The slippage that promotes dislocation is with soaring, thereby helps the forming core of recrystallize and grow up.At this moment; On the basis of external magnetic field; Only just can impel the generation of recrystallize and the redistribution of dislocation, thereby significantly reduce softening annealing temperature, shorten annealing time with less energy; Both reached reduction hardness, improved machinability, and made material significantly reduce again simultaneously because of phenomenons such as the too high distortion that causes of conventional annealing technological temperature, oxidation and melting loss of elements so that proceed the purpose of cold deformation.
Summary of the invention
The object of the present invention is to provide a kind of metallic substance softening annealing treatment process, this method can reduce softening annealing temperature, shorten annealing time.
To achieve these goals, the technical scheme that the present invention taked is: metallic substance softening annealing treatment process is characterized in that it comprises the steps:
1) at first outside the ceramic heat stove, field generator for magnetic is set, metallic substance to be processed is positioned in the ceramic heat stove heats, be heated to 300～550 ℃, and be incubated 30～60min;
2) starting field generator for magnetic then handles metallic substance; The magnetic selection of process parameters scope of described field generator for magnetic is: magnetic induction density is 1.8～2.2T, and field frequency is 0.1～20Hz, and the magnetic treatment time is 2～600s; At last the colder or air cooling of stove to room temperature.
The step 1) Heating temperature is 400～500 ℃, soaking time 30～60min.
Described magnetic induction density is 1.8～2.2T, and field frequency is 10～20Hz, and the magnetic treatment time is 30～60s.
Described ceramic heat stove is made by refractory ceramics, and the pyroceramic outside is covered with stainless steel; Be equipped with the thermopair of N～K calibration in the stove, thermopair links to each other with the digital display temperature regulator.
Described metallic substance is ferromagnetic metal material (GCr15 bar, T8 bloom, a 8MnSi bloom).
Compare with the softening annealing process of routine, the present invention has the following advantages:
1, the present invention is aided with periodically variable magnetic field on conventional annealing technology basis, can promote the forming core of recrystallize and grows up, and effectively reduces hardness.
2, through the exciting dislocation, promote the effect of recrystallize forming core of periodically changed magnetic field, significantly reduce the softening annealing temperature of material, shorten annealing time.
3, because annealing temperature is lower, has not only avoided phenomenons such as the too high distortion that causes of temperature, oxidation and part melting loss of elements, and obtained remarkable effects of energy saving and emission reduction.
Description of drawings
Fig. 1 is the layout synoptic diagram of ceramic heat stove of the present invention, field generator for magnetic.
Among the figure: 1-magnet coil, 2-cushion block, the metallic substance (workpiece) that 3-is to be processed, 4-ceramic heat stove, 5-three phase variable frequency regulator, 6-AC power.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with concrete embodiment, but content of the present invention not only is confined to following embodiment.The equalization of promptly doing according to claim of the present invention generally changes and modifies, and all should still belong in the scope that patent of the present invention contains.
Embodiment 1:
Metallic substance softening annealing treatment process (magnetic field of coupling period property variation on the basis of conventional softening annealing process, and soften processing to bearing steel GCr15 bar), it comprises the steps:
1) field generator for magnetic (the ceramic heat stove is positioned in the magnet coil of field generator for magnetic) at first is set outside the ceramic heat stove; The GCr15 bar that will be of a size of 50mm * Ф 30mm is positioned over heating (metallic substance to be processed places on the cushion block 2 that is arranged in ceramic heat stove 4) in the ceramic heat stove; Be heated to 450～500 ℃, and insulation 45min;
2) start field generator for magnetic then metallic substance is handled, produce periodically variable magnetic field material is handled; The magnetic selection of process parameters scope of described field generator for magnetic is: magnetic induction density is 1.8～2.2T, and field frequency is 10～20Hz, about 30～50s of magnetic treatment time; Cut off the electricity supply, cool to material with the furnace room temperature.
Handle back GCr15 bar through softening method provided by the present invention; Its HB is HWB216, and is higher than the summary behind conventional recrystallization annealing process, but softening annealing temperature provided by the present invention is than (770～780 ℃ of conventional annealing temperature; Insulation 2h) 270 ℃ have been reduced at least; And the treatment time shorten greatly, therefore, significantly reduced energy consumption.
Described ceramic heat stove 4 is made by refractory ceramics, and the outside is covered with the very big and erosion-resisting stainless steel of magnetic conduction, resistivity not; Be equipped with the thermopair of N～E calibration in the stove, thermopair links to each other with the digital display temperature regulator.Furnace temperature is measured and control through the digital display temperature regulator that links to each other with thermopair.
Described field generator for magnetic comprises magnet coil 1 and three phase variable frequency regulator 5, and magnet coil 1 links to each other the input termination AC power 6 of three phase variable frequency regulator through lead with the output terminal of three phase variable frequency regulator.
The used periodically variable magnetic field of the present invention is the magnet coil generation by certain number of turn shown in Figure 1.Magnet coil links to each other with the three phase variable frequency regulator, can change the size and the frequency of magnetizing current through this frequency conversion voltage adjusting device, and then changes size and the frequency that makes magnetic induction density.
Embodiment 2:
Metallic substance softening annealing treatment process (magnetic field of coupling period property variation on the basis of conventional softening annealing process, and soften processing to carbon tool steel T8), it comprises the steps:
1) field generator for magnetic (the ceramic heat stove is positioned in the magnet coil of field generator for magnetic) at first is set outside the ceramic heat stove; The T8 bloom shape of 20mm * 20mm * 20mm is positioned in the ceramic heat stove heats; Be heated to 400～450 ℃, and insulation 30min;
2) starting field generator for magnetic then handles metallic substance; The magnetic selection of process parameters scope of described field generator for magnetic is: magnetic induction density is 1.8～2.2T, and field frequency is 10～20Hz, and the magnetic treatment time is 40～60s; At last the colder or air cooling of stove to room temperature.
Handle back T8 bloom shape sample through softening method provided by the present invention; Its HB HBW192, roughly suitable with behind conventional recrystallization annealing process, but softening annealing temperature provided by the present invention is than (750～770 ℃ of conventional Spheroidizing Annealing temperature; Insulation 2h) 300 ℃ have been reduced at least; And the treatment time shorten greatly, therefore, significantly reduced energy consumption.
Embodiment 3:
Metallic substance softening annealing treatment process (magnetic field of coupling period property variation on the basis of conventional softening annealing process, and soften processing to die steel 8MnSi), it comprises the steps:
1) field generator for magnetic (the ceramic heat stove is positioned in the magnet coil of field generator for magnetic) at first is set outside the ceramic heat stove; Being positioned in the ceramic heat stove of 8MnSi bloom that will be of a size of 20mm * 20mm * 20mm heated; Be heated to 450～470 ℃, and insulation 60min;
2) starting field generator for magnetic then handles metallic substance; The magnetic selection of process parameters scope of described field generator for magnetic is: magnetic induction density is 1.8～2.2T, and field frequency is 10～20Hz, and the magnetic treatment time is 35～45s; At last the colder or air cooling of stove to room temperature.
Handle back 8MnSi bloom through softening method provided by the present invention; Its HB is HBW232, roughly suitable with behind conventional annealing process, but softening annealing temperature provided by the present invention is than (730～750 ℃ of general conventional annealing temperature; Insulation 1.5h) 260 ℃ have been reduced at least; And the treatment time shorten to some extent, therefore, also reduced energy consumption.
Claims (4)
1. metallic substance softening annealing treatment process is characterized in that it comprises the steps:
1) at first outside the ceramic heat stove, field generator for magnetic is set, metallic substance to be processed is positioned in the ceramic heat stove heats, be heated to 300～550 ℃, and be incubated 30～60min;
2) starting field generator for magnetic then handles metallic substance; The magnetic selection of process parameters scope of described field generator for magnetic is: magnetic induction density is 1.8～2.2T, and field frequency is 0.1～20Hz, and the magnetic treatment time is 2～600s; At last the colder or air cooling of stove to room temperature.
2. metallic substance softening annealing treatment process according to claim 1 is characterized in that: described ceramic heat stove is made by refractory ceramics, and the pyroceramic outside is covered with stainless steel; Be equipped with the thermopair of N～E calibration in the stove, thermopair links to each other with the digital display temperature regulator.
3. metallic substance softening annealing treatment process according to claim 1 is characterized in that: described magnetic induction density is 1.8～2.2T, and field frequency is 10～20Hz, and the magnetic treatment time is 30～60s.
4. metallic substance softening annealing treatment process according to claim 1 is characterized in that: described metallic substance is a ferromagnetic metal material.
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| CN2012101704737A CN102676748A (en) | 2012-05-29 | 2012-05-29 | Metal material softening annealing treatment method |
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| CN2012101704737A CN102676748A (en) | 2012-05-29 | 2012-05-29 | Metal material softening annealing treatment method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0533062A (en) * | 1991-07-26 | 1993-02-09 | Kawasaki Steel Corp | Production of nonoriented silicon steel sheet |
| CN1743469A (en) * | 2005-09-23 | 2006-03-08 | 东北大学 | Method for manufacturing non-oriented silicon steel sheet |
| CN101012531A (en) * | 2007-02-09 | 2007-08-08 | 上海大学 | Fe-based bulk amorphous alloy and method for preparing same |
-
2012
- 2012-05-29 CN CN2012101704737A patent/CN102676748A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0533062A (en) * | 1991-07-26 | 1993-02-09 | Kawasaki Steel Corp | Production of nonoriented silicon steel sheet |
| CN1743469A (en) * | 2005-09-23 | 2006-03-08 | 东北大学 | Method for manufacturing non-oriented silicon steel sheet |
| CN101012531A (en) * | 2007-02-09 | 2007-08-08 | 上海大学 | Fe-based bulk amorphous alloy and method for preparing same |
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Application publication date: 20120919 |