CN103194702B - Induction heat treatment method for reducing tension asymmetry of magnesium alloy material - Google Patents
Induction heat treatment method for reducing tension asymmetry of magnesium alloy material Download PDFInfo
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- CN103194702B CN103194702B CN201310144920.6A CN201310144920A CN103194702B CN 103194702 B CN103194702 B CN 103194702B CN 201310144920 A CN201310144920 A CN 201310144920A CN 103194702 B CN103194702 B CN 103194702B
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Abstract
The invention relates to an induction heat treatment method for reducing tension asymmetry of a magnesium alloy material, which aims at solving the problems that the existing magnesium alloy extruded and rolled deformation material is easy for having a basal texture and difficult to form secondarily. According to the deformation characteristics of twin crystal, a certain amount of compression pre-deformation is firstly applied along the main deformation direction of the extrusion and rolling, then induction heating quenching is adopted, so that the tension asymmetry of the magnesium alloy machining material can be reduced, and the plastic deformation capacity can be improved. The method is simple, feasible and effective. The induction heat treatment equipment which is widely used in the industry at present can be used, no additional investment is increased, the processing time is short, the production efficiency is high, the cost is low, and the application range is wide.
Description
Technical field
The invention belongs to Magnesium alloy AZ91D field, particularly a kind of induction heat treatment process method reducing magnesium alloy materials tension and compression asymmetry.
Background technology
Magnesium alloy have lightweight, specific tenacity is high, damping noise reduction, be easy to the advantages such as recovery, have broad application prospects in fields such as 3C, aerospace, communications and transportation.But, because magnesium and alloy thereof have Patterns for Close-Packed Hexagonal Crystal structure, only have basal slip system to start under room temperature and the critical resolved shear stress of basal slip much smaller than other slip system, therefore magnesium alloy often has strong basal plane texture after the deformation processing such as extruding, rolling, cause magnesium alloy to process material and show obvious anisotropy, i.e. tension and compression asymmetry.The magnesium alloy materials with such tension and compression asymmetry is processed in (i.e. post-forming process) process in the preparation of follow-up finished product, such as, strike out automobile body covering piece, notebook computer casing etc., by deterioration processability, causes serious product defects.This problem hinders the widespread use of magnesium alloy materials greatly.In order to solve the tension and compression asymmetry of above-mentioned magnesium alloy materials, the method adopted at present has two kinds, and one adds rare earth element in the magnesium alloy, namely adopts RE alloyedly to weaken magnesium alloy basal plane texture by forming rare earth texture.But because rare earth is expensive, magnesium-rare earth cannot be applied to the product for civilian use on a large scale.Another kind is the mode adopting multidirectional repeated deformation, is dispersed the processability improving magnesium alloy materials by grain refining or texture, but the method production efficiency is low, operation is many, complex process, and is only limitted to the processing treatment of small-size materials.
How providing a kind of simple processing method that effectively, can be used for the deformation processing such as conventional extrusion, rolling, that reduce magnesium alloy materials tension and compression asymmetry, is one of Pinch technology that magnesium alloy deformation material is used widely.
Summary of the invention
Be easy to occur basal plane texture for current magnesium alloy extrusion, rolling deformation material, be difficult to carry out the problem of post-forming process, the object of this invention is to provide a kind of simple induction heat treatment process that effectively, can be used for the deformation processing such as conventional extrusion, rolling, that reduce magnesium alloy materials tension and compression asymmetry.
Realize above-mentioned purpose, the technical solution used in the present invention is: a kind of induction heat treatment process method reducing magnesium alloy materials tension and compression asymmetry, it is characterized in that, this processing method proposes first to apply a certain amount of compression predeformation along extruding, the main deformation direction of rolling according to twin deformation characteristic, then adopts the method for induction heating and quenching; Concrete steps comprise:
By the magnesium alloy deformation material processed through conventional extrusion, rolling, apply the compression set of 5 ~ 10% dependent variables along main deformation direction;
Then, to the magnesium alloy deformation material of predeformation, adopt induction heating mode to be heated to 350 ~ 450 DEG C, stop 5 seconds ~ 10 minutes at such a temperature;
Again shrend quenching is carried out to the magnesium alloy deformation material after induction heating process, water temperature 60 ~ 70 DEG C.
Further, described magnesium alloy deformation material is AZ(Mg-Al-Zn) be, ZK(Mg-Zn-Zr) be or Mg-Mn series magnesium alloy.
Compared to existing technology, the present invention has following beneficial effect:
1) the present invention proposes the magnesium alloy deformation material that will process through conventional extrusion, rolling, applies the compression set of 5 ~ 10% dependent variables along main deformation direction.As described in the background art, magnesium alloy presents basal plane texture after the deformation processing such as extruding, rolling, under the effect of the force of compression along main deformation direction, will excite a large amount of in magnesium matrix
stretching twin.Basal plane texture is stronger, more easily occurs
stretching twin.Subsequently, induction heating is carried out to this magnesium alloy deformation material with twin structure and isothermal treatment for short time makes material surfaces externally and internally all reach 350 ~ 450 DEG C.Induction heating is under the effect of alternating electric field, utilize the induced current of metallic substance self to heat, and can be rapidly heated to preset temperature instantaneously.In the induction heat treatment process of such rapid heating, isothermal treatment for short time, because atom has little time diffusion, thus the grain-size of original distortion material and twin structure still remain unchanged, and the vacancy defect concentration meanwhile in material then increases considerably.Further, by shrend quenching, these rooms are remained.Research shows, the existence in room will reduce the critical resolved shear stress excited needed for twin greatly, and can grow under lower stress and continue to cause surrounding matrix generation deformation twins.Therefore, this twin structure magnesium alloy with supersaturation room makes its plastic deformation ability be improved significantly, and the tension and compression asymmetry of alloy when room temperature forming significantly reduces, and processability is obviously improved.
2) the present invention reduces the induction heat treatment process method of magnesium alloy materials tension and compression asymmetry according to the proposition of twin deformation characteristic, applied range, be applicable to the deformation processing such as conventional extrusion, rolling material, be applicable to be easy to all Magnesium Alloys that occur basal plane texture, that be difficult to carry out post-forming process simultaneously, comprise commercialization AZ(Mg-Al-Zn) be, ZK(Mg-Zn-Zr) be and the magnesium alloy such as Mg-Mn system.
3) the present invention reduces the induction heat treatment process method of magnesium alloy materials tension and compression asymmetry, technique simple possible, can use the Induction Heat Treatment Equipment of current industrial widespread use, not increase extra investment, and the treatment time is short, production efficiency is high, process costs is low.
Accompanying drawing explanation
Fig. 1 is the metallographic microstructure photo of Mg-1.8Mn alloy extrusion bar along direction of extrusion compression 10%;
Fig. 2 is the metallographic microstructure photo of Mg-1.5Zn-0.6Zr alloy extrusion bar along direction of extrusion precompression distortion 5%;
Fig. 3 is the metallographic microstructure photo after twin structure Mg-1.5Zn-0.6Zr alloy bar material 400 DEG C of induction heat treatment.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1: the Mg-1.8Mn alloy cast ingot adopting semicontinuous casting technique to obtain, after railway carriage, Homogenization Treatments, horizontal extruder is squeezed into the bar of Ф 16mm, after extruding, air cooling is to room temperature.Mechanics Performance Testing shows, this bar drawing yield strength is 175 MPa, and compression yield strength is 66MPa, and tensile pressure ratio is 2.65.Above-mentioned extruded bars is shown in magnesium alloy along direction of extrusion compression 10%, Fig. 1 and creates a large amount of twin structures.The Mg-1.8Mn alloy bar material with twin structure is carried out induction heat treatment, is heated to 352 DEG C, 390 DEG C, 433 DEG C respectively, and isothermal treatment for short time 5s, in the warm water of 70 DEG C, carry out shrend subsequently.Test is heated to room temperature tensile and the room temperature Compressive Mechanical Properties of the alloy bar material of differing temps respectively, and result is as shown in table 1.As can be seen from Table 1, after the induction heat treatment process process of reduction magnesium alloy materials tension and compression asymmetry proposed by the invention, the tensile pressure ratio of Mg-1.8Mn alloy bar material is reduced to 1.51 ~ 1.66, compared with tensile pressure ratio before treatment, reduce 37 ~ 43%, tension and compression asymmetry be improved significantly.Mechanical experimental results also shows, and the tensile and compressible strain that alloy bar material before treatment occurs when rupturing is respectively 7% and 19%; After induction heat treatment process process of the present invention, the tensile and compressible strain that the alloy bar material being heated to above-mentioned differing temps occurs when rupturing reaches 26 ~ 30% and 14 ~ 16% respectively, shows that the viscous deformation performance of alloy has had obvious improvement.
Table 1 adopts room temperature tensile and the Compressive Mechanical Properties of Mg-1.8Mn alloy bar material after the inventive method process
| Induction heating temperature (DEG C) | Tensile yield strength (MPa) | Compression yield strength (MPa) | Tensile pressure ratio |
| 352 | 53 | 88 | 1.66 |
| 390 | 48 | 74 | 1.54 |
| 433 | 47 | 71 | 1.51 |
Embodiment 2: the Mg-1.5Zn-0.6Zr alloy cast ingot adopting semicontinuous casting technique to obtain, after railway carriage, Homogenization Treatments, horizontal extruder is squeezed into the bar of Ф 16mm, after extruding, air cooling is to room temperature.Mechanics Performance Testing shows, this bar drawing yield strength is 220 MPa, and compression yield strength is 101MPa, and tensile pressure ratio is 2.18.Above-mentioned extruded bars is shown in magnesium alloy substrate along direction of extrusion compression 5%, Fig. 2 and creates a large amount of twin structures.The Mg-1.5Zn-0.6Zr alloy bar material with twin structure is carried out induction heating to 400 DEG C, and isothermal treatment for short time 10min, in the warm water of 70 DEG C or 60 DEG C, carry out shrend subsequently.Fig. 3 display is after the induction heat treatment of rapid heating of the present invention, isothermal treatment for short time, and the grain-size of the twin structure that precompression distortion produces and alloy still remains unchanged.Mechanics Performance Testing shows, after the induction heat treatment process process of reduction magnesium alloy materials tension and compression asymmetry proposed by the invention, room temperature tensile and the compression yield strength of Mg-1.5Zn-0.6Zr alloy bar material are respectively 67MPa and 113MPa, tensile pressure ratio is 1.69, compared with tensile pressure ratio before treatment, reduce 22%, tension and compression asymmetry be improved significantly.Mechanical experimental results also shows, and the tensile and compressible strain that alloy bar material before treatment occurs when rupturing is respectively 16% and 18%; After induction heat treatment process process of the present invention, the tensile and compressible strain that alloy bar material occurs when rupturing is respectively 35% and 15%, shows that the viscous deformation performance of alloy has had obvious improvement.
To sum up, the present invention proposes first to apply a certain amount of compression predeformation along extruding, the main deformation direction of rolling according to twin deformation characteristic, then adopt induction quenching, thus reach the tension and compression asymmetry reducing magnesium alloy processing material, the object improving plastic deformation ability.The method simple possible, successful, can use the Induction Heat Treatment Equipment of current industrial widespread use, not increase extra investment, and the treatment time is short, production efficiency is high, and cost is low, applied widely.
It should be noted that, the invention is not restricted to described embodiment.For the magnesium alloy of other series, even if processing parameter changes to some extent, as long as propose, all within scope according to the technology of the present invention thought.
Claims (1)
1. one kind is reduced the induction heat treatment process method of magnesium alloy materials tension and compression asymmetry, it is characterized in that, this processing method proposes first to apply a certain amount of compression predeformation along extruding, the main deformation direction of rolling according to twin deformation characteristic, then adopts the method for induction heating and quenching; Concrete steps comprise:
1) the magnesium alloy deformation material will processed through conventional extrusion, rolling, applies the compression set of 5 ~ 10% dependent variables along main deformation direction;
2) to the magnesium alloy deformation material of step 1) predeformation, adopt induction heating mode to be heated to 350 ~ 450 DEG C, stop 5 seconds ~ 10 minutes at such a temperature;
3) again shrend quenching is carried out to the magnesium alloy deformation material after induction heating process, water temperature 60 DEG C ~ 70 DEG C;
Described magnesium alloy deformation material is AZ(Mg-Al-Zn) be, ZK(Mg-Zn-Zr) be or Mg-Mn series magnesium alloy.
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| CN103540881B (en) * | 2013-11-08 | 2015-07-01 | 中南大学 | Processing method for improving drawing and pressing asymmetry of magnesium alloy |
| CN103911570A (en) * | 2014-03-26 | 2014-07-09 | 上海交通大学 | Rapid magnesium-rare earth alloy solution treatment method realized by utilizing intermediate frequency magnetic field |
| CN106978579B (en) * | 2017-05-22 | 2018-07-31 | 中南大学 | A method of improving magnesium-rare earth high temperature creep-resistant property using unusual twin |
| CN113136512B (en) * | 2020-12-31 | 2022-02-08 | 长沙理工大学 | Processing method for improving high-temperature creep property of magnesium alloy by rolling and pre-compression |
| CN115055803A (en) * | 2022-05-27 | 2022-09-16 | 广东省科学院中乌焊接研究所 | Method for improving mechanical property and structure thermal stability of magnesium alloy friction stir welding joint |
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| CN101280378A (en) * | 2008-02-27 | 2008-10-08 | 中国科学院长春应用化学研究所 | 20-100Hz frequency range high-damping aluminum-magnesium alloy and preparation thereof |
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| CN101280378A (en) * | 2008-02-27 | 2008-10-08 | 中国科学院长春应用化学研究所 | 20-100Hz frequency range high-damping aluminum-magnesium alloy and preparation thereof |
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| Title |
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| AZ31B镁合金薄板室温拉压不对称性能研究;廖龙欢等;《材料热处理技术》;20121130;第41卷(第22期);第70-72页 * |
| 高应变速率下AZ31镁合金的各向异性及拉压不对称性;毛萍莉等;《中国有色金属学报》;20120531;第22卷(第5期);第1262-1269页 * |
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