CN100351403C - Method for preventing coarse grain of deformed high temperature alloy - Google Patents
Method for preventing coarse grain of deformed high temperature alloy Download PDFInfo
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- CN100351403C CN100351403C CNB2005100423238A CN200510042323A CN100351403C CN 100351403 C CN100351403 C CN 100351403C CN B2005100423238 A CNB2005100423238 A CN B2005100423238A CN 200510042323 A CN200510042323 A CN 200510042323A CN 100351403 C CN100351403 C CN 100351403C
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Abstract
The present invention discloses a method for preventing the low time macrograins of wrought superalloy, which comprises two sets of measures. The first set of measures are preventive measures in forging technology, computer simulation is carried out with a DEFORM2D commerce simulation software, the amount of deformation in a minimum deforming part of a superalloy forging, and the amount of deformation generating recrystallization in an effective deformation part in a single time of heating is strictly controlled. The second set of the measures are preventive measures in preheat treatment, the heating temperature of forging is controlled strictly lower than 1160 DEG C, and the second set of the measures are used when the first set of the measures can not work effectively and completely. The production process with the adoption of the present invention can make the low time macrograins of the wrought superalloy achieve a qualified level, and the investment of special equipment is not needed so the production cost is not increased. The present invention can be widely used in the hydraulic and hammer deformation of a common superalloy.
Description
Technical field
The invention belongs to the wrought superalloy field, (method for preventing coarse grain of deformed high temperature alloy of single low power crystal grain＜1.0mm) is applicable to the making of Aeronautics and Astronautics engine, civilian high temperature resistant component particularly can to guarantee to reach qualified level by the underproof thermal distortion workpiece of macroscopic coarse grain.
Background technology
Wrought superalloy is as Aeronautics and Astronautics engine, civilian high temperature resistant component.Wrought superalloy is a matrix metal with iron, nickel, cobalt, a metalloid material that can long term operation under the high temperature more than 600 ℃ and certain stress.Superalloy has higher high temperature strength, good anti-oxidant and hot corrosion resistance, over-all propertieies such as good fatigue property, fracture toughness property, plasticity.Superalloy is single austenitic matrix tissue, the reliability that has favorable tissue stability at various temperatures and use.
The macroscopic coarse grain of wrought superalloy product is a kind of serious mass defect, and it not only seriously reduces the mechanical property of alloy, and serious the reduction work-ing life zero, parts also is one of reason of unexpected accident.Technological standard has strict demand to the macroscopic coarse grain particle size of wrought superalloy, and (single low power crystal grain≤1.5mm), in case the size that is above standard, material must be scrapped.It is a complicated technology difficult problem very that wrought superalloy produces macroscopic coarse grain, also is a kind of viscous deformation defective of superalloy parts scrap ratio maximum.
The macroscopic coarse grain proneness of wrought superalloy is different, and some superalloy uses existing deformation technique, does not in fact produce macroscopic coarse grain; The macroscopic coarse grain tendency of some superalloy is very serious, uses existing production technique to be easy to produce serious macroscopic coarse grain, for example G H36, GH4133, GH4698, GH4617 alloy etc.Research and practice through many decades are pointed out, the wrought superalloy macroscopic coarse grain that uses existing technology to be out of shape has three types: first, all kinds of wrought superalloy heavy forgings (＞1000 * 300mm), because of deflection difference, the remaining cast structure that produces in accumulative total small deformation district.It is the territory, incomplete recrystallization section in the distortion workpiece; The second, workpiece effectively adds up the zone that distortion does not surpass alloy critical strain (＜10%), still keeps the big crystal grain of distortion heating; The 3rd, alloy gather the large size recrystal grain that gross distortion (ε＞60%) district produces (＞1.5mm).
Existing production technique can not effectively prevent the major cause of wrought superalloy macroscopic coarse grain to be: because the high temperature deformation equipment of present domestic use is ordinary press and forging hammer, can not control effectively to texturing temperature scope, deflection and Deformation velocity, and these three parameters are very important to the prevention macroscopic coarse grain; Forging deformation is only considered the requirement of forging shape and size, does not consider the influence of the distortion at the concrete position of forging to macroscopic coarse grain; The Forge Heating temperature is generally selected handbook data for use, considers the resistance to deformation and the plasticity value of alloy at the most, does not consider the influence to macroscopic coarse grain.
Summary of the invention
The object of the present invention is to provide a kind of deficiency that overcomes above technology, can make forging macroscopic coarse grain grain reach the method for preventing coarse grain of deformed high temperature alloy of standard-required.
For reaching above purpose, the technical solution adopted in the present invention is: this method for preventing coarse grain of deformed high temperature alloy, it is characterized in that it has two cover measures, first cover is the measure of forging process prevention macroscopic coarse grain, carry out computer simulation with the commercial simulation software of DEFORM2D, press the DEFORM2D software requirement, the shape of input starting material and forging, size, the various performance parameters of input material, the effective deformation amount of grasping Dan Huoci produces the deflection of recrystallize greater than forging minimal deformation position, determine the forging equipment and the forging method of deflection ε＞10% at superalloy forging minimal deformation position, grasp the Forge Heating temperature and be lower than 1160 ℃; Second cover is the measure of conditioning heat treatment prevention macroscopic coarse grain, be that the forging workpiece that does not carry out standard thermal treatment is carried out ultrahigh-temperature, preheats the back air cooling when ultrashort, the ultrahigh-temperature Heating temperature surpasses 30～40 ℃ of existing standard thermal treatment solid solution Heating temperatures, giving heat-up time is 5～30min, and the type of cooling is an air cooling; When the first cover measure of use can not prove effective or produce accident fully, adopt the second cover measure.The present invention also implements by following measure: according to three types of the wrought superalloy macroscopic coarse grain, forging process prevention macroscopic coarse grain of the present invention measure is:
(1) when remaining cast structure that prevents the superalloy heavy forging and small deformation district macroscopic coarse grain, its main points are:
A: the effective deformation amount of grasping Dan Huoci produces the deflection of recrystallize greater than forging minimal deformation position:
(the remaining cast structure of＞Φ 1000 * 300mm) and general forging small deformation district produce macroscopic coarse grain and are not decided by total ratio of forging reduction the wrought superalloy heavy forging, but are decided by the effective deformation amount of Dan Huoci.That is to say that the effective deformation amount of Dan Huoci must produce the deflection (heavy forging minimal deformation position produces deflection ε=10% of recrystallize) of recrystallize greater than forging minimal deformation position;
B: concrete grammar is to adopt the commercial simulation software of DEFORM2D to carry out computer simulation: its practice is by the DEFORM2D software requirement, shape, the size of input starting material and forging, the various performance parameters of input material is determined the forging equipment and the forging method of deflection ε＞10% at superalloy forging minimal deformation position;
(2) when the macroscopic coarse grain of prevention forging drastic deformation position, grasp the Forge Heating temperature and be lower than 1160 ℃.
Especially the die forging of wrought superalloy distortion, local drastic deformation is inevitable.Therefore, the preventive measures of this class macroscopic coarse grain are very important.Each wrought superalloy all has a Forge Heating temperature bank, generally is 1160 ℃.Forge Heating surpasses this temperature, forges drastic deformation position (ε＞60%) and will produce macroscopic coarse grain; Forge Heating is lower than this temperature, and the drastic deformation position does not only produce macroscopic coarse grain, and low power crystal grain is very tiny.So the key link of forging drastic deformation position macroscopic coarse grain prevention technology is that the Forge Heating temperature is lower than 1160 ℃; The measure of described conditioning heat treatment prevention macroscopic coarse grain, the superalloy that the present invention exemplifies is general to adopt 1120～1220 ℃, and the time of preheating is 5～30min.
Conditioning heat treatment prevention macroscopic coarse grain processing requirement is very strict, also will increase the forging manufacturing cost, and therefore, only after standard thermal treatment, macroscopic coarse grain is scrapped under the bigger situation of ratio, can use.
Carry out this technology two maximum difficult points are arranged: the first, ultrahigh-temperature has only 5～30min warm up time, and forging may not reach soaking, can not reach prevention macroscopic coarse grain effect yet; The second, after the preheating of increase ultrahigh-temperature, the alloy part mechanical property changes, and does not reach standard-required.The technological measure that solves first difficult problem is: when carrying out actual forging conditioning heat treatment, take the mode of being rapidly heated directly to be warmed up to the conditioning heat treatment temperature, according to unlike material, heat-up rate adopts 9～15 ℃/hmm.The technological measure that solves second difficult problem is: need not take additional measures to the GH36 alloy, to GH4133, GH4698 alloy forged piece, after conditioning heat treatment, should change standard thermal treatment solid solution heating back air cooling into water-cooled.
Beneficial effect of the present invention is: compare with the processing method of present use, the production technique that adopts the present invention to formulate can make the macroscopic coarse grain of wrought superalloy product reach qualified level, and need not specific equipment investment, do not improve production cost, can be widely used in the hydraulic pressure and the hammering distortion of common superalloy.
Specific embodiment
Embodiment 1
Certain the aircraft engine GH36 alloy one-level turbine disk and heavy ring stamp work, produce over nearly 30 years, the macroscopic coarse grain scrap rate on average＞10%, adopt the first cover forging process prevention macroscopic coarse grain measure of the present invention, promptly carry out computer simulation with the commercial simulation software of DEFORM2D, every performance index of input material, determine deflection ε=10% at superalloy forging minimal deformation position, the effective deformation amount of control Dan Huoci produces deflection ε＞10% of recrystallize greater than forging minimal deformation position, the product of producing after measured, the macroscopic coarse grain scrap rate approaches 0%.
Embodiment 2
Certain aircraft engine GH4133A engine turbine stamp work once produced vast scale macroscopic coarse grain discard aborning, when stamp work is refined in trial-production, also produced serious macroscopic coarse grain.Adopt forging process prevention macroscopic coarse grain of the present invention measure, its step is with embodiment 1, after the conditioning heat treatment preventive measures, again the forging workpiece that does not carry out standard thermal treatment is carried out ultrahigh-temperature, preheats the back air cooling when ultrashort, the ultrahigh-temperature Heating temperature surpasses 30-40 ℃ of existing thermal treatment solid solution Heating temperature 1120-1220, preheating 25min carries out air cooling, and the stamp work macroscopic coarse grain is stopped fully.
Embodiment 3
When manufacturing experimently certain aircraft engine GH698 alloy turbine stamp work (not formal produce), or the GH698 alloy warship of manufacturing experimently at present all produces macroscopic coarse grain with the turbine stamp work time to some extent in the past.With the technology of embodiment 2, just in conditioning heat treatment technology, change air cooling into water-cooled among employing the present invention, make macroscopic coarse grain reach qualified level fully.
Claims (2)
1, a kind of method for preventing coarse grain of deformed high temperature alloy, it is characterized in that it has two cover measures, first cover is the measure of forging process prevention macroscopic coarse grain, carry out computer simulation with the commercial simulation software of DEFORM2D, press the DEFORM2D software requirement, the shape of input starting material and forging, size, the various performance parameters of input material, the effective deformation amount of grasping Dan Huoci produces the deflection of recrystallize greater than forging minimal deformation position, determine the forging equipment and the forging method of deflection ε＞10% at superalloy forging minimal deformation position, grasp the Forge Heating temperature and be lower than 1160 ℃; Second cover is the measure of conditioning heat treatment prevention macroscopic coarse grain, be that the forging workpiece that does not carry out standard thermal treatment is carried out ultrahigh-temperature, preheats the back air cooling when ultrashort, the ultrahigh-temperature Heating temperature surpasses 30～40 ℃ of existing standard thermal treatment solid solution Heating temperatures, giving heat-up time is 5～30min, and the type of cooling is an air cooling; When the first cover measure of use can not prove effective or produce accident fully, adopt the second cover measure.
2, method for preventing coarse grain of deformed high temperature alloy according to claim 1, it is characterized in that when carrying out actual forging conditioning heat treatment, take the mode of being rapidly heated directly to be warmed up to the conditioning heat treatment temperature, according to unlike material, heat-up rate adopts 9～15 ℃/hmm; Need not take additional measures to the GH36 alloy,, after conditioning heat treatment, should change standard thermal treatment solid solution heating back air cooling into water-cooled GH4133, GH4698 alloy forged piece.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100423238A CN100351403C (en) | 2005-01-12 | 2005-01-12 | Method for preventing coarse grain of deformed high temperature alloy |
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| CNB2005100423238A CN100351403C (en) | 2005-01-12 | 2005-01-12 | Method for preventing coarse grain of deformed high temperature alloy |
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| CN100351403C true CN100351403C (en) | 2007-11-28 |
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| CN102373366A (en) | 2010-08-26 | 2012-03-14 | 宝山钢铁股份有限公司 | Method for improving coarse grains on surface of non-oriented silicon steel |
| CN103128256B (en) * | 2013-03-14 | 2015-05-20 | 哈尔滨工业大学 | Preparation method for GH 4133 nickel-base superalloy semisolid blank |
| CN113092253B (en) * | 2021-04-06 | 2022-12-27 | 无锡透平叶片有限公司 | Method for measuring critical deformation condition of wrought alloy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165204A (en) * | 1996-05-09 | 1997-11-19 | 沈阳黎明发动机制造公司 | Method for nickel-base high-temp. alloy forging and bar acquiring uniform superfine crystalline grain |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165204A (en) * | 1996-05-09 | 1997-11-19 | 沈阳黎明发动机制造公司 | Method for nickel-base high-temp. alloy forging and bar acquiring uniform superfine crystalline grain |
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