CN108342668A - High-entropy alloy turns round pier and pulls out Combined Machining Technology - Google Patents
High-entropy alloy turns round pier and pulls out Combined Machining Technology Download PDFInfo
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- CN108342668A CN108342668A CN201810052772.8A CN201810052772A CN108342668A CN 108342668 A CN108342668 A CN 108342668A CN 201810052772 A CN201810052772 A CN 201810052772A CN 108342668 A CN108342668 A CN 108342668A
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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
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Abstract
Pier is turned round the invention belongs to high entropy alloy material and pulls out Combined Machining Technology method, is a kind of using high-entropy alloy as the efficient plastics modification method of application.The invention aims to solve high-entropy alloy as-cast structure based on large dendritic crystal, comprehensive mechanical property is poor, the problem of needing plastics modification thinning microstructure.Preparation method includes mainly：Prepare high-entropy alloy ingot casting, homogenization heat treatment, analogue simulation turns round pier pulling forging, obtains the ingot blank of high-entropy alloy.Mainly apply certain twisting resistance in upsetting process when the present invention handles high-entropy alloy ingot casting, stress state effectively during control inside high entropy alloy material, by applying shear stress in deformation process with crystal grain thinning, upsetting pull efficiency is improved, realizes the high effective and modified of high-entropy alloy.The present invention can finally effectively improve the plastics modification efficiency of high-entropy alloy, refine microstructure, improve comprehensive mechanical property.
Description
Technical field
The invention belongs to metal materials to process the Combined Machining Technology method that is modified by Plastic Forming, be it is a kind of with
High-entropy alloy is the material plasticity method of modifying of application.
Background technology
Through the ages, human being's production and the everyway of life be unable to do without research and development and utilization to material, and material is developing
Play immeasurable key player in course.With modern economy, science and technology and the fast development of military affairs, people take alloy
The requirement for using as a servant performance is higher and higher.And high-entropy alloy breaches limitation of the conventional alloys based on one or two kinds of elements, by five
Kind or five kinds or more elements according to equimolar than the new alloy material being configured to, there is high intensity, high rigidity, wear-resisting, corrosion resistant
The excellent properties such as erosion and resistance to high temperature oxidation, are widely used in modern industry.But since high-entropy alloy component number is more
And simple solid solution phase is formed again, inevitably resulting in solid solution structure, there are certain distortions of lattice, and atomic size difference is bigger,
Distortion of lattice is more serious, strongly limits it and shapes and practical application, therefore improves its grain structure and be of great significance,
In order to eliminate casting flaw, high-entropy alloy generally use is forged and is modified.
Jumping-up is so that forge piece blank reheating height is reduced in forging processing, and the increased forming process of cross-sectional area, pulling is to make cross
Sectional area reduces, the forging process that length increases, and it is to improve microcosmic group of material by plastic processing method that jumping-up pulling, which is combined,
The important process method knitted.The metallurgical imperfections such as carbide, the congenital loose hole of forging conjunction can be smashed by upsetting pull technique, to obtain
The forging for obtaining homogeneous densification, for eliminating casting flaw, refiner material tissue improves the comprehensive mechanical property of material with important
Meaning.
But jumping-up is pure stress, and crystal grain is subjected only to active force and the change of continuous single direction during compressive deformation
Shape, grain refining efficiency is low, and the modified technique period is caused to lengthen, and energy consumption increases, and upsetting pull efficiency reduces.
In consideration of it, the present invention proposes a kind of simple torsion pier pulling Combined Machining Technology easily realized.Lead in upsetting process
It crosses mould structure and applies certain shear stress to material, by the collective effect of compression stress and shear stress, adjust material
The stress state of microstructure increases plastic stress deviator, to improve material refining efficiency, reduces upsetting pull process time and energy
Source consumes, and realizes and regulates and controls to the fining plasticity of high-entropy alloy microstructure, realizes efficient plastics modification.
Invention content
Present invention aims at：It is provided under the premise of more mature metal jumping-up system of processing a kind of for height
The torsion pier of entropy alloy service demand pulls out Combined Machining Technology method.For the hot-working feature of high-entropy alloy, using turning round repeatedly
The forging technology of upsetting pull length effectively controls the stress state in deformation process inside high entropy alloy material, it is inclined to increase plastic stress
Amount, improves material refining efficiency, and crystal grain thinning quickly improves material and integrates mechanical property, realizes effective modification of high-entropy alloy.
This method and aftertreatment technology are easily operated, of low cost, can be quickly obtained the uniform excellent height of structure property
Entropy alloy ingot blank material, effectively improves its service ability.The high-volume of high-entropy alloy can not only be promoted to use using this method, and
And it can also be effectively improved and control the mechanical property of high-entropy alloy.
To reach above-mentioned technical goal, the present invention is realized using following technical scheme：
The first step：The making of high-entropy alloy original blank.According to ingot blank measure high-entropy alloy bar, closed according to high entropy
The difference of payment organization composition is heated to 1000 DEG C -1100 DEG C of initial temperature, then according to bar thickness 0.8-1min/mm into
Row isothermal holding keeps the temperature 12-100h, its interior tissue is made to homogenize.
Second step：Bar turns round pier processing and analysis.In conjunction with the composition and deformation characteristics of selected high-entropy alloy, pass through meter
Calculation and analog simulation obtain the stress characteristics and rule of ingot blank different parts in deformation process, select suitable upset ratio and torsion
Turn power size.
Third walks：It carries out turning round jumping-up processing, twisting resistance is applied by helical structure while jumping-up unidirectionally deforms, is promoted
It deforms under the collective effect of two kinds of stress of compression shear of material, efficiently refines material structure.
4th step：Pulling processing is carried out to the material after torsion upsetting.Shear stress is applied with to material in the process due to turning round upsetting,
Material internal can have certain shear strain and shearing residual stress, therefore pulling process in which materials feeding need to increase overturning,
To improve materials microstructure uniformity.
5th step：High-entropy alloy bar after the completion of pulling is reentered into heating furnace heating, heat preservation.When reaching deformation temperature
Afterwards, high temperature torsion pier Compound Machining modification again after being rotated by 90 ° is taken out.Deformation temperature is about 1000 DEG C -1100 according to material difference
DEG C, preferably 1100 DEG C, strain rate 0.01s-1-0.1s-1, preferred 0.05s-1。
6th step:Above step is repeated, carrying out repeatedly multi-pass to high-entropy alloy block turns round pier pulling Compound Machining.Until
The more tiny and even tissue to crystal grain, the high-entropy alloy ingot blank with excellent service ability.
Compared with prior art, beneficial effects of the present invention are as follows：
High-entropy alloy as-cast structure is seriously affected the performance of its comprehensive mechanical property, is especially existed based on coarse dendrite
Under the conditions of dynamic impulsion, easily induced breakage needs to carry out plastic processing modification there are huge hidden dangers in project.Traditional upsetting pull
In technique, jumping-up is uniaxial stressed state, and crystal grain is subjected only to active force and the change of continuous single direction during compressive deformation
Shape, grain refining efficiency is low, and the modified technique period is caused to lengthen, and energy consumption increases.Combined Machining Technology is pulled out using pier is turned round,
By shear stress crystal grain thinning, improve the microstructure and mechanical property of material, the plasticity that can significantly improve high-entropy alloy changes
Property efficiency.
Description of the drawings
Fig. 1 is process flow chart prepared by high-entropy alloy ingot blank.
Specific embodiment
With AlCoCrFeNiTi0.5For, present embodiment, which is a kind of combined by high temperature torsion upsetting pull length, efficiently to be improved
AlCoCrFeNiTi0.5The method of high-entropy alloy ingot blank tissue and mechanical property, is completed according to the following steps when specific：
(1) prepare high-entropy alloy AlCoCrFeNiTi0.5Ingot casting：It is selected to be divided into AlCoCrFeNiTi0.5High-entropy alloy
Ingot casting, the molar ratio of 6 kinds of elements is respectively Al：Co：Cr:Fe：Ni：Ti=1:1:1:1:1:0.5.
(2) homogenization heat treatment：The AlCoCrFeNiTi that step (1) is chosen0.5High-entropy alloy ingot casting carries out homogenization heat
Processing, the temperature for homogenizing heat treatment is 1000 DEG C -1100 DEG C, is then carried out at heat preservation according to The ingot casting thickness 0.8-1min/mm
Reason, the soaking time for homogenizing heat treatment is 12h-100h, obtains the high-entropy alloy ingot casting of interior tissue homogenization of composition.
(3) deformation process analog simulation：Computer Simulation is carried out to turning round pier deformation process by numerical simulation software, is obtained
The stress characteristics and rule of deformation process ingot blank different parts, the especially distribution characteristics of compression stress and shear stress.
(4) pier processing is turned round：According to the analog simulation in step (3) as a result, selection is suitble to AlCoCrFeNiTi0.5Jumping-up
Than carrying out turning round pier processing with twisting resistance.
(5) fabrication design and analog simulation are pulled out：It is imitative that computer is carried out to pulling deformation process by numerical simulation software
Very, the stress characteristics and rule of deformation process ingot blank different parts are obtained.
(6) pulling processing：According to the analog simulation in step (5) as a result, selecting AlCoCrFeNiTi appropriate0.5Technique
Parameter carries out pulling processing.
(7) pier, pulling processing are turned round again：Continue the 5th step and the 6th flow repeatedly, pulled out after first turning round pier, turns round pier deflection
It need to rationally control, need to melt down heating after pulling.
(8) final to obtain the tiny high-entropy alloy ingot blank material of dense structure's crystal grain after multi-pass turns round upsetting pull length.
The advantages of present embodiment：
(1) present embodiment pulls out the high-entropy alloy component that combined machining method is prepared by turning round pier, due in jumping-up
The twisting resistance for keeping application certain high-entropy alloy ingot blank in the process can significantly improve jumping-up material modification efficiency, obtain crystal grain
More tiny even tissue improves the service ability of high-entropy alloy.
(2) present embodiment can meet the high-entropy alloy component of different sizes, and in conventional pressure and upper logical
It crosses and the simple transformation of mold can be thus achieved, simple and practicable, application easy to spread.
Claims (2)
1. a kind of method pulling out Combined Machining Technology improvement high entropy alloy material interior tissue crystal grain thinning by turning round pier, specifically
It completes according to the following steps：
(1) it is directed to the requirement of Service Environment, prepares required high-entropy alloy ingot casting；
(2) homogenization heat treatment：The ingot casting for the high-entropy alloy that step (1) is chosen is subjected to homogenization heat treatment, is homogenized at heat
The temperature of reason is 1000 DEG C -1100 DEG C, then carries out isothermal holding, homogenization heat treatment according to The ingot casting thickness 0.8-1min/mm
Soaking time be mainly chosen for 12h-100h, obtain the high-entropy alloy ingot casting of interior tissue homogenization of composition；
(3) deformation process analog simulation：Computer Simulation is carried out to deformation process by simulation softward, obtains and turns round pier pulling deformation
The stress characteristics and rule of process ingot blank different parts, the especially regularity of distribution of compression stress and shear stress；
(4) the parameter selection upset ratio and twisting resistance obtained according to (3) carries out turning round pier processing；
(5) after the completion of turning round pier, the parameter obtained according to (3) carries out pulling processing；
(6) the high-entropy alloy bar after the completion of pulling out is being put into heating furnace heating, heat preservation, after reaching deformation temperature, takes out rotation
High temperature turns round the modification of pier Compound Machining again after turning 90 degrees, and deformation temperature is about 1000 DEG C -1100 DEG C according to material difference, preferably
1100 DEG C, strain rate 0.01s-1-0.1s-1, preferred 0.05s-1；
(7) above step is repeated, carrying out repeatedly multi-pass to high-entropy alloy block turns round pier pulling Compound Machining, until obtaining crystal grain more
For tiny and even tissue, the high-entropy alloy ingot blank with excellent service ability.
2. according to claim 1 a kind of by turning round answering inside pier pulling Combined Machining Technology improvement high entropy alloy material
The method of power state, it is characterised in that：Due to keeping application certain high-entropy alloy ingot blank in upsetting process in 1 step (4)
Twisting resistance, formed shear stress can effective crystal grain thinning, improve grain refining efficiency；2 by with compression stress and shearing
The collective effect of stress is crushed as cast condition high-entropy alloy large dendritic crystal, improves structural homogenity, significantly improves high-entropy alloy military service energy
Power realizes the high effective and modified of high-entropy alloy.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810052772.8A CN108342668A (en) | 2018-01-19 | 2018-01-19 | High-entropy alloy turns round pier and pulls out Combined Machining Technology |
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| CN201810052772.8A CN108342668A (en) | 2018-01-19 | 2018-01-19 | High-entropy alloy turns round pier and pulls out Combined Machining Technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109554638A (en) * | 2019-01-10 | 2019-04-02 | 北京理工大学 | A kind of high-entropy alloy gradient nano material preparation method |
| CN110717272A (en) * | 2019-10-11 | 2020-01-21 | 内蒙古第一机械集团股份有限公司 | Coupling simulation method for material forming and modifying process |
Citations (2)
| 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 |
| US20170275745A1 (en) * | 2016-03-11 | 2017-09-28 | The Industry & Academic Cooperation In Chungnam National University (Iac) | High Entropy Alloy Having Composite Microstructure and Method of Manufacturing the Same |
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2018
- 2018-01-19 CN CN201810052772.8A patent/CN108342668A/en active Pending
Patent Citations (2)
| 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 |
| US20170275745A1 (en) * | 2016-03-11 | 2017-09-28 | The Industry & Academic Cooperation In Chungnam National University (Iac) | High Entropy Alloy Having Composite Microstructure and Method of Manufacturing the Same |
Non-Patent Citations (1)
| Title |
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| 高锦张等: "《塑性成形工艺与模具设计》", 31 August 2001, 机械工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109554638A (en) * | 2019-01-10 | 2019-04-02 | 北京理工大学 | A kind of high-entropy alloy gradient nano material preparation method |
| CN110717272A (en) * | 2019-10-11 | 2020-01-21 | 内蒙古第一机械集团股份有限公司 | Coupling simulation method for material forming and modifying process |
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Application publication date: 20180731 |