CN109385546A - A kind of thinning method of high temperature alloy crystal grain - Google Patents
A kind of thinning method of high temperature alloy crystal grain Download PDFInfo
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- CN109385546A CN109385546A CN201811294940.0A CN201811294940A CN109385546A CN 109385546 A CN109385546 A CN 109385546A CN 201811294940 A CN201811294940 A CN 201811294940A CN 109385546 A CN109385546 A CN 109385546A
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- high temperature
- crystal grain
- temperature alloy
- thinning method
- thinning
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/023—Alloys based on nickel
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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
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
- C22F3/02—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons by solidifying a melt controlled by supersonic waves or electric or magnetic fields
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- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The present invention provides a kind of thinning methods of high temperature alloy crystal grain, belong to materials processing technology field.Thinning method provided by the invention, comprising the following steps: under conditions of gradient magnetic and inert gas, high temperature alloy is subjected to melt process and cooling, the purpose of the alloy grain that reaches a high temperature refinement.This method interrupts primary dendrite in the gradient magnetizing force that crystallisation by cooling process generates using gradient magnetic, the dendrite fragment of fracture forming core again, to improve the nucleation rate of crystal grain；Magnetic force and magnetizing force can inhibit atom to spread again simultaneously, and then inhibit growing up for crystal grain, so that final crystallite dimension reduces.From embodiment as can be seen that using thinning method of the invention, the average-size of crystal grain is 300 μm in high temperature alloy.
Description
Technical field
The present invention relates to materials processing technology field more particularly to a kind of thinning methods of high temperature alloy crystal grain.
Background technique
Because high temperature alloy has high-intensitive, preferably anti-oxidant, corrosion resisting property and good low-cycle fatigue, widely answer
For Aeronautics and Astronautics, industrial fuel engine power generation and express locomotive etc..Wherein, aero-engine turbine disk, low-pressure turbine are used for
The high temperature alloy of machine blade and ground combustion machine, since operating temperature is mostly at 760 DEG C or less, it is desirable that the casting section of high temperature alloy
With equiax crystal as tiny as possible, the continuous carbide precipitate of crystal boundary is avoided；As few as possible microshrinkage and as few as possible
Segregation.But model casting high-temperature alloy casting mostly there is coarse grains and nonuniform organization and association segregation increase
Increase phenomenon with shrinkage cavity；These above-mentioned phenomenons reduce the fatigue behaviour and reliability of the components such as turbo blade and the turbine disk.Solution
Certainly the key of this series of problems is to reduce crystallite dimension, obtains uniform fine grain casting.
There are mainly three types of currently used crystal fining methods: chemometamorphism agent method, vibratory drilling method and thermal control method, principle are
The a large amount of forming cores of crystallization process are promoted using thinning method, while limiting the fast-growth of nucleus, to obtain thinner crystallization group
It knits.Adding grain refiner is to make crystal grain refinement by external nucleus, can refine crystal grain to the greatest extent, but due to high temperature
Alloy is especially sensitive to being mingled with, and the addition due to carbide, oxycarbide, ceramics, oxide etc. as nucleating agent, makes shape in addition
Nuclear location can become fatigue crack source, therefore many nucleating agents effective on non-ferrous alloy or Ferrous Metallurgy are unsuitable for
In high temperature alloy.Although and vibratory drilling method and thermal control method can reduce interdendritic away from segregation being preferably minimized, the method is not easy
The big casting of sectional dimension is refined, and is easy to produce internal stress, it is difficult to be controlled.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of thinning methods of high temperature alloy crystal grain.Using of the invention
Thinning method can be improved the nucleation rate of crystal grain, while can also inhibit growing up for crystal grain, so that final crystallite dimension becomes smaller.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of thinning methods of high temperature alloy crystal grain, comprising the following steps:
Under conditions of gradient magnetic and inert gas, high temperature alloy is subjected to melt process and cooling, reach a high temperature conjunction
Golden crystal grain refinement.
Preferably, the range of the gradient magnetic is 50~100T2/m。
Preferably, the temperature of the melt process is 1480~1550 DEG C, and soaking time is 20~40min.
Preferably, the heating rate for being warming up to the melt process temperature is 5~10 DEG C/min.
Preferably, the mode of the cooling is air-cooled.
Preferably, the high temperature alloy includes nickel base superalloy or cobalt base superalloy.
The present invention provides a kind of thinning methods of high temperature alloy crystal grain, comprising the following steps: in gradient magnetic and inertia
Under conditions of gas, high temperature alloy is subjected to melt process and cooling, the alloy grain that reaches a high temperature refinement.This method utilizes gradient
Primary dendrite is interrupted in the gradient magnetizing force that crystallisation by cooling process generates in magnetic field, the dendrite fragment of fracture forming core again, to mention
The nucleation rate of high crystal grain；Magnetic force and magnetizing force can inhibit atom to spread again simultaneously, inhibit growing up for crystal grain, so that final crystal grain ruler
Very little reduction.In addition, thinning method of the invention is easy to control, it is easy to operate.From embodiment as can be seen that using of the invention thin
Change method, the average-size of crystal grain are 300 μm.
Detailed description of the invention
Fig. 1 is the EBSD picture of 1 high temperature alloy test specimen of embodiment；
Fig. 2 is the EBSD picture of 2 high temperature alloy test specimen of embodiment；
Fig. 3 is the EBSD picture of 3 high temperature alloy test specimen of embodiment；
Fig. 4 is the EBSD picture of 1 high temperature alloy test specimen of comparative example.
Specific embodiment
The present invention provides a kind of thinning methods of high temperature alloy crystal grain, comprising the following steps:
Under conditions of gradient magnetic and inert gas, high temperature alloy is subjected to melt process and cooling, reach a high temperature conjunction
Golden crystal grain refinement.
The present invention does not have special restriction to the type of the high temperature alloy, using high temperature well known to those skilled in the art
Alloy, specifically, such as nickel base superalloy or cobalt base superalloy.The present invention is to the source of the high temperature alloy without spy
Different restriction, using commercial product well known to those skilled in the art, specifically such as, and nickel base superalloy K418, cobalt-based
High temperature alloy K640.
In the present invention, the gradient magnetic ranges preferably from 50~100T2/ m, more preferably 60~90T2/ m, it is optimal
It is selected as 70~80T2/m.In the present invention, the inert gas preferably includes nitrogen, argon gas or helium.
In the present invention, the temperature of the melt process is preferably 1480~1550 DEG C, and more preferably 1490~1540 DEG C,
More preferably 1500~1520 DEG C.In the present invention, the soaking time of the melt process is preferably 20~40min, more preferably
For 25~35min, most preferably 30min.In the present invention, the pressure of the melt process is preferably normal pressure.In the present invention,
The heating rate for being warming up to the melt process temperature is preferably 5~10 DEG C/min, more preferably 6~9 DEG C/min, most preferably
7~8 DEG C/min.
In the present invention, the mode of the cooling is preferably air-cooled.
This method interrupts primary dendrite, the branch of fracture in the gradient magnetizing force that crystallisation by cooling process generates using gradient magnetic
Brilliant fragment forming core again, to improve the nucleation rate of crystal grain；Magnetic force and magnetizing force can inhibit atom to spread again simultaneously, inhibit crystal grain
Grow up so that final crystallite dimension reduces.From embodiment as can be seen that using thinning method of the invention, crystal grain is averaged
Having a size of 300 μm.
It is described in detail below with reference to thinning method of the embodiment to high temperature alloy crystal grain provided by the invention, still
They cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
Line cutting technology is used to nickel base superalloy K418 coupon, be cut at Cong Bangzhong same plane Φ 10mm ×
The cylindrical body of 15mm polishes bottom surface on cylindrical body；Grinded cylinder test specimen is packed into corundum crucible, test specimen will be housed
Corundum crucible be put into the flat-temperature zone of heating furnace, heating furnace is put into magnetic field.
After logical argon gas 30min, 1500 DEG C of progress melt process 30min are warming up to the rate of 10 DEG C/min, are air-cooled to room
Temperature；Applying intensity in entire melt process and cooling procedure is 50T2The gradient magnetic of/m.
Obtained test specimen is polished, is polished.EBSD test is carried out to test specimen using scanning electron microscope, each condition carries out
Three groups of experiments, calculate crystallite dimension.As a result are as follows: the average grain size for the superalloy specimens that the present embodiment obtains is
360μm；The EBSD picture of the test specimen is as shown in Figure 1.
Embodiment 2
Similar to Example 1, difference is only that, the gradient intensity is 80T2/m；Using method same as Example 1
Test the average grain size of test specimen.As a result are as follows: the superalloy specimens average grain size that the present embodiment obtains is 320 μm；
Its EBSD picture is as shown in Figure 2.
Embodiment 3
Similar to Example 1, difference is only that, the gradient intensity is 100T2/m；Using side same as Example 1
The average grain size of method test test specimen.As a result are as follows: the average grain size for the superalloy specimens that the present embodiment obtains is 260
μm, EBSD picture is as shown in Figure 3.
Comparative example 1
Similar to Example 1, difference is only that, the gradient magnetic field strength is 0T2/m；Using same as Example 1
The crystallite dimension of method test test specimen.As a result are as follows: the average grain size for the superalloy specimens that this comparative example obtains is 3mm；
Its EBSD picture is as shown in Figure 4.
The EBSD picture of 1 high temperature alloy of comparative example 1~3 and comparative example, it will thus be seen that each different block area generation
One crystal grain of table, it is clear that after addition gradient magnetic, the size of crystal grain, which is significantly less than, does not add magnetic field acquisition crystallite dimension.
This method interrupts primary dendrite, the branch of fracture in the gradient magnetizing force that crystallisation by cooling process generates using gradient magnetic
Brilliant fragment forming core again, to improve the nucleation rate of crystal grain；Magnetic force and magnetizing force can inhibit atom to spread again simultaneously, inhibit crystal grain
Grow up so that final crystallite dimension reduces.From embodiment as can be seen that using thinning method of the invention, crystal grain is averaged
Having a size of 300 μm, the crystal grain obtained compared to the thinning method for not carrying out magnetic field control has significant decrease.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of thinning method of high temperature alloy crystal grain, comprising the following steps:
Under conditions of gradient magnetic and inert gas, high temperature alloy is subjected to melt process and cooling, reach a high temperature alloy crystalline substance
Grain refinement.
2. thinning method according to claim 1, which is characterized in that the range of the gradient magnetic is 50~100T2/m。
3. thinning method according to claim 1 or 2, which is characterized in that the temperature of the melt process be 1480~
1550 DEG C, soaking time is 20~40min.
4. thinning method according to claim 3, which is characterized in that be warming up to the heating rate of the melt process temperature
For 5~10 DEG C/min.
5. thinning method according to claim 1, which is characterized in that the mode of the cooling is air-cooled.
6. thinning method according to claim 1, which is characterized in that the high temperature alloy includes nickel base superalloy or cobalt
Based high-temperature alloy.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811294940.0A CN109385546A (en) | 2018-11-01 | 2018-11-01 | A kind of thinning method of high temperature alloy crystal grain |
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| CN201811294940.0A CN109385546A (en) | 2018-11-01 | 2018-11-01 | A kind of thinning method of high temperature alloy crystal grain |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639278A (en) * | 1980-10-31 | 1987-01-27 | Sony Corporation | Method of manufacturing an amorphous magnetic alloy |
| CN102601330A (en) * | 2011-12-20 | 2012-07-25 | 上海大学 | Method for refining crystalline grains by Alfven wave for upward continuous casting |
| CN103464706A (en) * | 2013-09-26 | 2013-12-25 | 上海大学 | Method and device for continuously casting and preparing high-oriented uniform fine-crystalline structure |
-
2018
- 2018-11-01 CN CN201811294940.0A patent/CN109385546A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639278A (en) * | 1980-10-31 | 1987-01-27 | Sony Corporation | Method of manufacturing an amorphous magnetic alloy |
| CN102601330A (en) * | 2011-12-20 | 2012-07-25 | 上海大学 | Method for refining crystalline grains by Alfven wave for upward continuous casting |
| CN103464706A (en) * | 2013-09-26 | 2013-12-25 | 上海大学 | Method and device for continuously casting and preparing high-oriented uniform fine-crystalline structure |
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Application publication date: 20190226 |