CN108004492A - A kind of efficient controlled rolling method of modifying of high-entropy alloy - Google Patents
A kind of efficient controlled rolling method of modifying of high-entropy alloy Download PDFInfo
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- CN108004492A CN108004492A CN201711143456.3A CN201711143456A CN108004492A CN 108004492 A CN108004492 A CN 108004492A CN 201711143456 A CN201711143456 A CN 201711143456A CN 108004492 A CN108004492 A CN 108004492A
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- rolling
- entropy alloy
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- entropy
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
Abstract
Modified technical method is processed by Plastic Forming specifically for metal material the present invention relates to a kind of, is a kind of, efficient controlled rolling plastics modification technical method of the high-entropy alloy that in deformation process easily cracks serious specifically for distortion of lattice.The purpose of the present invention essentially consists in：A kind of rolling processing for high-entropy alloy service demand and plastics modification method are proposed on the premise of more mature metal rolled system of processing.For the hot-working feature of high-entropy alloy, using squabbing roll, high-entropy alloy direction position is adjusted according to roller diameter difference, to carry out the method for repeat-rolling, effectively controls the stress state in deformation process inside high entropy alloy material, suppress the germinating and extension for the micro-crack that distortion of lattice induces, crystal grain thinning, improves comprehensive mechanical property, realizes the effective modification and machine-shaping of high-entropy alloy, rolling efficiency is high, is remarkably improved production efficiency and saves economic and time cost.
Description
Technical field
The invention belongs to metal material to be processed modified technical method by Plastic Forming, be one kind specifically for crystalline substance
Lattice distortion is serious, the efficient controlled rolling plastics modification technical method of the high-entropy alloy easily to crack in deformation process.
Background technology
Metal material is that the important substance that the mankind depend on for existence and development is basic, the important breakthrough each time of metal material,
The change of distinctness will be brought to social productive forces.Over nearest more than 100 years, metal material has obtained hair most fast since the dawn of human civilization
Exhibition.But we also noted that, with industry and the fast development of science and technology, the Service Environment of material is increasingly harsh, people couple at the same time
The physical and mechanical properties of metal material are constantly put forward higher requirements, to meet growing use of the people to material
It is required that traditional metal material urgently develops.
The existing frequently-used conventional alloys of people are to be used as essential element based on one or two kinds of elements, by addition on a small quantity its
Its element and the metal material with metallic character formed.Although the mankind achieve plentiful and substantial in the development of different performance alloy
Achievement, still, design of the people to alloy and the selection to alloying element still based on single-element or compound, this
Big change does not occur for kind idea.In this context, the performance study of material and materials application are restricted significantly.
High-entropy alloy is considered as that (in addition two are big respectively to one of three quantum jumps of alloying theory in decades recently
Block glassy metal and rubber-metal), it by 5 kinds or more than 5 kinds elements is essential element to be, each essential element content is 5~35%,
With equimolar ratio or nearly equimolar than having the new alloy material of the high entropy of mixing made of smelting, sintering or other methods.
The design concept of high-entropy alloy uniqueness and its many excellent comprehensive mechanical property is imparted with special institutional framework, it is such as high-strength
Degree, high rigidity, high abrasion corrosion resistance, resistance to high temperature oxidation, high thermal stability etc..
Since high-entropy alloy is made of multielement constituent element, its as-cast structure is more based on thick dendrite, this knot of tissue
Structure can the serious comprehensive performance for influencing high-entropy alloy.Dendrite, crystal grain thinning can be crushed by plastic working, but due to height
The presence of thick atom radius constituent element in entropy alloy, causes it easily to be opened in plastic history there are serious distortion of lattice
Split, the formation of crackle can seriously affect the application of material, this causes the follow-up exploitation use of high-entropy alloy by great limit
System.In order to eliminate casting flaw, to high-entropy alloy it is generally necessary to plastics modification.
Rolling is the efficient material processing method in the gap that metal stock is passed through a pair of of rotary roller, because being pressed by roll
Contracting, material section reduce, length increase.Wherein hot rolling can destroy the cast sturcture of ingot blank, crystal grain thinning, and eliminate micro- group
The defects of knitting, so that tissue is closely knit, mechanical property is improved.
But by after hot rolling, to being gradually reduced, length direction constantly extends material thickness, and applicable physical dimension is subject to
Limit, can only be used after multi- pass rolling as plate, seriously limit the engineer application scope of high-entropy alloy.Rolling at the same time
During, internal field trash is pressed into thin slice, lamination occurs so that blank is along thickness side's penalty, and have can
Laminated tearing can occur.
In consideration of it, the present invention propose it is a kind of specifically for the simple of high-entropy alloy and the constraint controlled rolling plastics modification easily realized
Method.Processed, effectively controlled in plastic processing inside ingot blank by applying abundant multi- pass rolling to high-entropy alloy ingot blank
Stress and tissue, effectively suppressing the germinating and extension of micro-crack in high-entropy alloy deformation process, it is real while crystal grain thinning
Existing material physical dimension is controllable, is recycled the high effective and modified method of high-entropy alloy of deformation.By being recycled efficient rolling, improve high
Entropy alloy interior tissue, improves forming property, and the plastic working for high-entropy alloy has great importance and acts on being modified.
This process is on the basis of existing conventional mill, it is only necessary to and simple transformation is carried out to roll structure and can be achieved, it is simple and practicable, it is easy to
Promote and apply.
The content of the invention
It is an object of the invention to：It is proposed that one kind is directed on the premise of more mature metal rolled system of processing
The rolling processing of high-entropy alloy service demand and plastics modification method.For the hot-working feature of high-entropy alloy, rolled using ladder
Roller, by the difference of roller diameter and the direction and position of adjustment high-entropy alloy, carries out repeat-rolling, effectively controls in deformation process
Stress state inside high entropy alloy material, suppresses the germinating and extension of the micro-crack that distortion of lattice induces, crystal grain thinning, is improved
Comprehensive mechanical property, realizes the high effective and modified of high-entropy alloy and processing.Since Rolling Production is efficient, after the first work step machines
Cooling is smaller, can carry out immediately second, third, the rolling of the work step such as 4th, it is middle without be heated again, can significantly carry
High-ductility modification efficiency, saves economic and time cost.
, can be by Roller Design into shape as shown in Figure 1 based on the advantages of processing is rolled in background technology.Using the roll into
During row rolling, it can follow the steps below：
The first step：According to the shape of high-entropy alloy block, suitable one group is selected from multigroup roller diameter, high-entropy alloy block is existed
Rolled under the roller diameter, in the operation of rolling, alloy block is thinning along roller diameter direction thickness, and alloy internal vertical is in roller diameter direction
Crackle and stomata the defects of obtain effectively closed elimination, width Free Transform.
Second step：After the completion of rolling, the alloy block for completing the rolling of the first work step is rotated by 90 ° along rolling direction for axis, will
The elongated side of width size selects another group of roller diameter gap to be rolled as rolling end face after the completion of first step rolling
The defects of making, realizing perpendicular to the crackle and stomata in roller diameter direction also obtains closure and eliminates.
3rd step：The alloy block for completing the second step operation of rolling is rotated by 90 ° again along roll axis direction, reselection
The defects of one group of roller diameter gap is rolled, the crackle and stomata of realizing rolling direction also obtains closure and eliminates.
4th step：Above step is repeated, multi- pass rolling repeatedly is carried out to high-entropy alloy block.
Rolling of the design for high-entropy alloy has the advantages that incomparable, is mainly manifested in the following aspects：
1. Roller Design is suitable for the rolling to the material of different-thickness, be also applied for same into stepped diameter
One material carries out staged and repeatedly rolls, and can carry out flexible combined deformation, mechanization degree is high, substantially increases rolling
Efficiency so that small lot production is more convenient, reduces production cost.
2. high-entropy alloy as-cast structure based on thick dendrite, seriously affects the performance of its comprehensive mechanical property, especially
Under the conditions of dynamic impulsion, easily induced breakage, there are huge hidden dangers in project, it is necessary to carry out plastic working modification.And due to
High intensity high-entropy alloy is serious for often crystal lattice distortion, easily cracks in plastic processing.Repeat to roll by comprehensive
Compression stress can be effectively improved by processing, the broken large dendritic crystal of completion, crystal grain thinning, improve the microstructure and mechanical property of material
Can, realize processing modified.High-entropy alloy has some incomparable excellent properties relative to conventional alloys, such as high intensity, height
Hardness and high-wearing feature, therefore high-entropy alloy can carry out multi-pass repeat-rolling, obtained product is by with fabulous mechanics
Performance is to meet a variety of Service Environments.
3. stairstepping roll, rolling efficiency is high, can carry out rolling for the second passage after the completion of the first rolling pass at once
System, can avoid traditional operation of rolling from producing residual stress because inhomogeneous cooling is even, simultaneously because Rolling Production is efficient, material temperature
Drop small, without middle heating in the Simulation Based On Multi-step operation of rolling, significantly reduce production cost, improve production efficiency.
4. due to the presence of thick atom radius constituent element in high-entropy alloy, cause it there are serious distortion of lattice, in plasticity
Easily crack in deformation process, the presence of crackle would necessarily affect the performance of material.And rolling by multi-pass repeatedly
Process processed, the defects of can effectively reducing inside alloy.Blank cooling is small in the operation of rolling of the present invention, is more advantageous to quick thin
Change crystal grain.
Brief description of the drawings
Process flow chart prepared by high-entropy alloy ingot blank is shown in Figure of description.
Embodiment
With Al0.5Exemplified by CoCrFeNi high-entropy alloys, embodiment is to prepare even tissue by one kind constraint controlled rolling technology
And the Al that mechanical property significantly improves0.5The method of CoCrFeNi high-entropy alloy ingot blanks, is completed according to the following steps when specific：
(1) high-entropy alloy is prepared：Al0.5CoCrFeNi ingot castings：It is selected to be divided into Al0.5The casting of the high-entropy alloy of CoCrFeNi
Ingot, the molar ratio of 5 kinds of elements is respectively Al：Co：Cr:Fe：Ni=0.5:1:1:1:1.
(2) homogenization heat treatment：The Al that step (1) is chosen0.5CoCrFeNi high-entropy alloys ingot casting carries out homogenizing hot place
Reason, the temperature for homogenizing heat treatment are 1000 DEG C -1100 DEG C, then carry out isothermal holding according to The ingot casting thickness 0.8-1min/mm,
The soaking time of homogenization heat treatment is 12h-100h, obtains the high-entropy alloy ingot casting of interior tissue homogenization of composition.
(3) according to the shape of high-entropy alloy block, suitable one group is selected from multigroup roller diameter, by high-entropy alloy block in the roller
Rolled under footpath, in the operation of rolling, alloy block is thinning along roller diameter direction thickness, and alloy internal vertical is split in roller diameter direction
The defects of line and stomata, obtains effectively closed elimination, perpendicular to the both ends Free Transform of the alloy block of rolling direction.
After the completion of (4) first passes, the alloy block for completing first step rolling is rotated by 90 ° by axis of rolling direction,
The elongated side of width size is rolled as rolling end face, one group of roller diameter of reselection after the completion of the first step is rolled,
The defects of perpendicular to the crackle and stomata in roller diameter direction, also obtains closure and eliminates.
(5) alloy block for completing the second step operation of rolling is rotated by 90 ° again along roll axis direction, one group of reselection
The defects of roller diameter is rolled, the crackle and stomata of realizing rolling direction also obtains closure and eliminates.
(6) above step is repeated, multi- pass rolling repeatedly is carried out to high-entropy alloy block, until alloy interior tissue is even and fine
Turn to only.
The advantages of present embodiment：
(1) high-entropy alloy that present embodiment is prepared by efficient controlled rolling method of modifying, due to beginning in process
Repeat-rolling is implemented to high-entropy alloy blank eventually, the caused micro-crack of high-entropy alloy severe lattice distortion can be suppressed well
Germinating and extension, obtain the high-entropy alloy ingot blank that crystal grain is more tiny and even tissue, has excellent service ability.
(2) present embodiment can meet the high-entropy alloy component of different sizes, and process can be one
It can be achieved on platform milling train, simple and practicable, application easy to spread.
Claims (2)
- It is one kind specifically for lattice 1. the invention belongs to metal material to be processed modified technical method by Plastic Forming Distortion is serious, the efficient controlled rolling plastics modification technical method of the high-entropy alloy easily to crack in deformation process, specifically by following Step is completed：The first step：According to the shape of high-entropy alloy block, suitable one group is selected from multigroup roller diameter, by high-entropy alloy block in the roller Rolled under footpath, in the operation of rolling, alloy block is thinning along roller diameter direction thickness, and alloy internal vertical is split in roller diameter direction The defects of line and stomata, obtains effectively closed elimination, perpendicular to the both ends Free Transform of the alloy block of rolling direction；Second step：After the completion of rolling, soon the alloy block for completing first step rolling is rotated by 90 ° by axis of rolling direction, will The elongated side of width size is rolled as rolling end face, one group of roller diameter of reselection after the completion of first step rolling, is hung down Directly closure is also obtained in the defects of crackle and stomata in roller diameter direction to eliminate；3rd step：The alloy block for completing the second step operation of rolling is rotated by 90 ° again along rolling direction, one group of roller diameter of reselection Rolled, along rolling direction crackle and stomata the defects of also obtain closure eliminate；4th step：Above step is repeated, multi- pass rolling repeatedly is carried out to high-entropy alloy block.
- 2. one kind according to claim 1 is serious specifically for distortion of lattice, the high entropy easily to crack in deformation process The constraint controlled rolling plastics modification technical method of alloy, it is characterised in that：1. by Roller Design into stepped diameter, that is, it is suitable for pair The rolling of the material of different-thickness, is also applied for carrying out staged rolling to same material, can carry out flexible combined deformation, Mechanization degree is high, substantially increases the efficiency of rolling so that small lot production is more convenient, reduces production cost；2. high entropy As-cast Microstructure seriously affects the performance of its comprehensive mechanical property based on thick dendrite, especially in dynamic impulsion condition Under, easily induced breakage, there are huge hidden dangers in project, it is necessary to carry out plastic working modification, and due to high intensity high-entropy alloy Often crystal lattice distortion is serious, easily cracks in plastic processing, and rolling processing by comprehensive repetition can effectively improve Compression stress, completes broken large dendritic crystal, crystal grain thinning, improves the microstructure and mechanical property of material, realize processing modified； High-entropy alloy has some incomparable excellent properties relative to conventional alloys, such as high intensity, high rigidity and high-wearing feature, Therefore high-entropy alloy can carry out multi-pass repeat-rolling, obtained product by with fabulous mechanical property to meet various differences Service Environment；3. stairstepping roll, rolling efficiency is high, can carry out the second passage after the completion of the first rolling pass at once Rolling, can avoid traditional operation of rolling from producing residual stress because inhomogeneous cooling is even, simultaneously because Rolling Production is efficient, material Temperature drop is small, without middle heating in the Simulation Based On Multi-step operation of rolling, significantly reduces production cost, improves production efficiency；4. due to high entropy The presence of thick atom radius constituent element in alloy, causes it easily to crack in plastic history there are serious distortion of lattice, The presence of crackle would necessarily affect the performance of material, and by the operation of rolling of multi-pass repeatedly, can effectively it subtract Less the defects of alloy inside, blank cooling is small in the operation of rolling of the present invention, is more advantageous to rapid refinement crystal grain.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543749A (en) * | 2015-12-10 | 2016-05-04 | 北京理工大学 | High-entropy alloy gradient stress modification technology |
| CN107083527A (en) * | 2017-04-20 | 2017-08-22 | 南京工程学院 | It is a kind of to be heat-treated the method that plastic deformation improves single-phase high-entropy alloy intensity that combines |
| CN107151755A (en) * | 2017-05-11 | 2017-09-12 | 浙江大学 | A kind of method for the high-entropy alloy for preparing close-packed hexagonal structure |
-
2017
- 2017-11-17 CN CN201711143456.3A patent/CN108004492A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543749A (en) * | 2015-12-10 | 2016-05-04 | 北京理工大学 | High-entropy alloy gradient stress modification technology |
| CN107083527A (en) * | 2017-04-20 | 2017-08-22 | 南京工程学院 | It is a kind of to be heat-treated the method that plastic deformation improves single-phase high-entropy alloy intensity that combines |
| CN107151755A (en) * | 2017-05-11 | 2017-09-12 | 浙江大学 | A kind of method for the high-entropy alloy for preparing close-packed hexagonal structure |
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