CN103436827A - Thermal treatment technology of large-size high-strength wrought magnesium alloy forging - Google Patents
Thermal treatment technology of large-size high-strength wrought magnesium alloy forging Download PDFInfo
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Abstract
The invention relates to a thermal treatment technology of a large-size high-strength wrought magnesium alloy forging, and particularly relates to a thermal treatment technology of a wrought magnesium alloy forging of an Mg-Al-Zn system. The implementation scheme of the invention is as follows: preserving heat of the large-size wrought magnesium alloy forging with the wall thickness of 30-100mm, the diameter (phi) of greater than or equal to 680mm and the maximum horizontal projection area of greater than or equal to 0.4m<2> at 80-100 DEG C for 36-48 hours; heating to 160-180 DEG C at a rate of 15-30 DEG C per hour, and preserving heat for 15-20 hours; and cooling to room temperature to obtain the large-size high-strength wrought magnesium alloy forging, wherein the magnesium alloy forging comprises the following elements in percentage by mass: 8.2-8.5% of Al, 0.4-0.5% of Zn, 0.2-0.25% of Mn, less than or equal to 0.05% of Cu, less than or equal to 0.005% of Ni, less than or equal to 0.15% of Si, less than or equal to 0.02% of Be, less than or equal to 0.05% of Fe, less than or equal to 0.3% of other impurities and the balance of Mg. By adopting the technology provided by the invention, the prepared large-size high-strength wrought magnesium alloy forging can meet the using requirements for the parts of the fields of transportation, aerospace and the like; and the preparation technology is simple and easy to implement, and industrial production is facilitated.
Description
Technical field
The present invention relates to a kind of thermal treatment process of large size high-strength deforming magnesium alloy forging, the thermal treatment process of the large size wrought magnesium alloys forging that particularly a kind of Mg-Al-Zn is.
Background technology
It is the wrought magnesium alloys of relatively commonly using that Mg-Al-Zn is associated gold, it is cheap, it is the magnesium alloy materials that relatively is suitable for widespread use, this series alloy not only can carry out moulding distortion, and there is the ageing strengthening effect, deforming alloy is carried out to the ageing strengthening processing and can make its mechanical property be greatly improved.It is higher that die forging has production efficiency, the forging of energy shaping form complexity, and forging ' s block dimension is accurate, takes full advantage of material, reduces the processing clout and improves the advantages such as the strength of materials and plasticity.Magnesium alloy thermal treatment adopts T5 and T6 thermal treatment usually, and T5 is for casting or shape the rear artificial aging of directly carrying out, and T6 is for casting or shape and first carry out solution treatment and carry out artificial aging again afterwards.Research shows deformation states Mg-Al-Zn is associated that gold carries out T5 or T6 thermal treatment can improve its tensile strength, yield strength greatly.
For stamp work, can obtain higher intensity although adopt T6 to process, carry out when solution hardening is processed causing part to deform or hardening break before timeliness for complex-shaped large-scale stamp work, thereby part is scrapped.Thereby for large-scale stamp work, especially complex-shaped, there is the stamp work of wall thickness variation, be more suitable in adopting T5 thermal treatment.It should be noted that for complex-shaped,, when T5 processes, there is the different phenomenon of deflection everywhere in the large-scale part of inhomogeneity of wall thickness during due to die forging, makes inside parts stress energy storage difference everywhere.At single temperature, timeliness can cause sequencing and the size difference that the different positions strengthening phase is separated out, be that preferentially separate out the position that deformation energy is large, when the little position of deformation energy reaches the timeliness peak value, overaging has occurred in the position that deformation energy is large, causes performance inequality everywhere.
At present, the technique that adopts the multistage aging system to process complex-shaped, as to have wall thickness variation stamp work has no report in pertinent literature.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of thermal treatment process of large size high-strength deforming magnesium alloy forging is provided.
The thermal treatment process of a kind of large size high-strength deforming magnesium alloy of the present invention forging, its embodiment is: large size wrought magnesium alloys forging, at 80 ℃-100 ℃, is incubated after 36-48 hour, with the temperature rise rate of 15-30 ℃/h, is warming up to 160-180 ℃, insulation 15-20 hour, be cooled to room temperature.
The thermal treatment process of a kind of large size high-strength deforming magnesium alloy of the present invention forging, its preferred embodiment is: at 90 ℃-100 ℃, ageing treatment large size wrought magnesium alloys forging is after 40-45 hour, temperature rise rate with 20-30 ℃/h is warming up to 160-180 ℃, insulation 15-20 hour, be cooled to room temperature.
The thermal treatment process of a kind of large size high-strength deforming magnesium alloy of the present invention forging, the wall thickness of described large size wrought magnesium alloys forging is 30-100mm, diameter of phi>=680mm, maximum horizontal shadow area>=0.4m
2.
The thermal treatment process of a kind of large size high-strength deforming magnesium alloy of the present invention forging, described large size wrought magnesium alloys forging is the stamp work that has wall thickness variation.
The thermal treatment process of a kind of large size high-strength deforming magnesium alloy of the present invention forging, described large size wrought magnesium alloys forging comprises following component by percentage to the quality:
Al 8.2-8.5%, Zn 0.4-0.5%, Mn 0.2-0.25%, Cu<=0.05%, Ni<=0.005%, Si<=0.15%, Be<=0.02%, Fe<=0.05%, other Za Zhi<=0.3%, surplus is Mg.
The thermal treatment process of a kind of large size high-strength deforming magnesium alloy of the present invention forging, the mechanical property of the large size high-strength deforming magnesium alloy forging after thermal treatment is as follows:
Transverse tensile strength is 356MPa-389.7MPa; Transverse yield strength is 249.5MPa-290.3MPa; Endwise tensile strength is 282.5MPa-290.6MPa; Vertically yield strength is 187.8MPa-192.5MPa.
The thermal treatment process of a kind of large size high-strength deforming magnesium alloy of the present invention forging, by following method, prepared by described large size wrought magnesium alloys forging:
After the large size magnesium alloy forging cake of cut-off footpath >=670mm is machined to blank by the blank dimension designed, be heated to 380-430 ℃, after insulation 3-6h, carry out an isothermal die forging process moulding under 380-430 ℃, obtain forging, cooling after the taking-up forging, obtain finished product; The average crystal grain Li Du of described large size magnesium alloy forging cake<=15 μ m, the ratio of equi-axed crystal number and total number of die >=0.95; During isothermal die forging process, the downstream rate of patrix is 0.05-0.2mm/s, and the descending time of patrix is 10-30min, and pressure is 35000-40000kN, pressurize 30-40min after moulding; ; Isothermal die forging process mould therefor and die holder reference plane coordinate Jian Xi<=0.2mm; The temperature of mould equates with the Heating temperature of blank; The speed of cooling of forging is 100-150 ℃/min; Described blank is inner without obvious crackle, shrinkage cavity, the defect that is mingled with.
The thermal treatment process of a kind of large size high-strength deforming magnesium alloy of the present invention forging, it is to process by following step with the inner cast magnesium alloys ingot without obvious crackle, shrinkage cavity, the defect that is mingled with that described large size magnesium alloy is forged cake:
Step 1
Cast magnesium alloys ingot after homogenizing thermal treatment is heated to 400-430 ℃, after insulation 6-10h, carries out pier at 400-430 ℃ thick, pulling, the forging ratio that pier is thick is 1.5-2; The forging ratio of pulling is: 1.02-1.05, and pier is thick, during pulling, and its Deformation velocity is 12-16mm/s; The diameter of described cast magnesium alloys cylinder ingots is 250mm-350mm, and the scope of aspect ratio is at 1.5-1.85; Described pulling is that the 12-16 face rolls pulling; Described homogenizing thermal treatment is described cast magnesium alloys ingot to be warming up to after 320-350 ℃ to the temperature rise rate with 12-27 ℃/h again with the temperature rise rate of 20-25 ℃/min be warming up to 410-430 ℃, insulation 20-30h, then the speed of cooling with 2-10 ℃/min is cooled to room temperature;
Step 2
Heating in repeating step one, insulation, pier are thick, pulling technique, until magnesium alloy forging stock diameter is more than or equal to 670mm, obtain large size magnesium alloy forging cake; In repeating step, the thick temperature of each insulation, pier before once insulation, the low 10-20 ℃ of temperature that pier is thick.
Principle and advantage
1. the present invention adopts the two-stage time effect system, first at 80 ℃-100 ℃ long-time ageing treatment large size of low temperature wrought magnesium alloys forging 36-48 hour, this has not only eliminated the uneven energy storage inequality caused of distortion, play the effect of deformation energy homogeneous annealing, simultaneously under low aging temp, precipitation strength does not reach and separates out required motivating force mutually, in separating out incubation period.Then the temperature rise rate with 15-30 ℃/h slowly is warming up to Precipitation Temperature, and the process slowly heated up can guarantee part being heated evenly everywhere, so that realize evenly separating out of each position, the final purpose that realizes improving material mechanical performance while separating out.
2. the present invention directly carries out artificial aging by the forging after shaping, and without solution treatment, this has just prevented that forging from ftractureing in quenching process.
3. the mechanical property of the prepared large size high-strength deforming magnesium alloy forging of the present invention is superior, and its transverse tensile strength is 356MPa-389.7MPa; Transverse yield strength is 249.5MPa-290.3MPa; Endwise tensile strength is 282.5MPa-290.6MPa; Vertically yield strength is 187.8MPa-192.5MPa.The wrought magnesium alloys forging prepared with existing heat treatment technics compared, and its transverse tensile strength, transverse yield strength, endwise tensile strength, vertical yield strength and unit elongation are improved.
4. technique of the present invention is simple, safe and reliable, and the equipment adopted is conventional resistance furnace.Can be used for processing complex-shaped wrought magnesium alloys forging.
Embodiment
The present invention is further elaborated in conjunction with example below with reference to subordinate list, should be noted that these examples are for the present invention, rather than limitation of the present invention, protection scope of the present invention is not limited to following scope.
In embodiment and Comparative Examples, the mechanical property of forging thickness, thinnest part, with reference to GB GBT228.1-2010 metal material stretching test room temperature test method, is carried out room temperature tensile on the microcomputer controlled electronic universal testing machine.
Magnesium alloy in embodiment comprises following component by percentage to the quality: Al 8.2-8.5%, Zn 0.4-0.5%, Mn 0.2-0.25%, Cu<=0.05%, Ni<=0.005%, Si<=0.15%, Be<=0.02%, Fe<=0.05%, other Za Zhi<=0.3%, surplus is Mg.
In embodiment, prepared by following method by described large size wrought magnesium alloys forging:
After the large size magnesium alloy forging cake of cut-off footpath>=670mm is machined to blank by the blank dimension designed, be heated to 380-430 ℃, after insulation 3-6h, carry out an isothermal die forging process moulding under 380-430 ℃, obtaining wall thickness is 30-100mm; Diameter of phi>=680mm, maximum horizontal shadow area>=0.4m
2, there is the large size magnesium alloy forging of wall thickness variation, take out after forging coolingly, obtain finished product; The average crystal grain Li Du of described large size magnesium alloy forging cake<=15 μ m, the ratio of equi-axed crystal number and total number of die>=0.95; During isothermal die forging process, the downstream rate of patrix is 0.05-0.2mm/s, and the descending time of patrix is 10-30min, and pressure is 35000-80000kN, pressurize 30-40min after moulding; ; Isothermal die forging process mould therefor and die holder reference plane coordinate Jian Xi<=0.2mm; The temperature of mould equates with the Heating temperature of blank; The speed of cooling of forging is 100-150 ℃/min; Described blank is inner without obvious crackle, shrinkage cavity, the defect that is mingled with.Detect the mechanical property of large size wrought magnesium alloys forging, its detected value is as shown in table 1.
It is to process by following step with the inner cast magnesium alloys ingot without obvious crackle, shrinkage cavity, the defect that is mingled with that described large size magnesium alloy is forged cake:
Step 1
Cast magnesium alloys ingot after homogenizing thermal treatment is heated to 400-430 ℃, after insulation 6-10h, carries out pier at 400-430 ℃ thick, pulling, the forging ratio that pier is thick is 1.5-2; The forging ratio of pulling is: 1.02-1.05, and pier is thick, during pulling, and its Deformation velocity is 12-16mm/s; The diameter of described cast magnesium alloys cylinder ingots is 250mm-350mm, and the scope of aspect ratio is 1.5～1.85; Described pulling is that the 12-16 face rolls pulling; Pier is thick, during pulling, the pressure pressed down is 20000-30000KN; Described homogenizing thermal treatment is described cast magnesium alloys ingot to be warming up to after 320-350 ℃ to the temperature rise rate with 12-27 ℃/h again with the temperature rise rate of 20-25 ℃/min be warming up to 410-430 ℃, insulation 20-30h, then the speed of cooling with 2-10 ℃/min is cooled to room temperature;
Step 2
Heating in repeating step one, insulation, pier are thick, pulling technique, until magnesium alloy forging stock diameter is more than or equal to 670mm, obtain large size magnesium alloy forging cake; In repeating step, the thick temperature of each insulation, pier before once insulation, the low 10-20 ℃ of temperature that pier is thick.
Embodiment 1:
It is raw material that the present embodiment be take large size wrought magnesium alloys forging; Described large size wrought magnesium alloys forging is magnesium-aluminum-zinc series deformation magnesium alloy forging, and each element mass percent is: Al8.2-8.5; Zn0.4-0.5; Mn0.2-0.25; Cu<=0.05; Ni<=0.005; Si<=0.15; Be<=0.02; Fe<=0.05; Other Za Zhi<=0.3; Surplus is Mg.
By large size wrought magnesium alloys forging black furnace charging, be warming up to 100 ℃ of ageing treatment 38 hours, then design temperature is 170 ℃, the heating-up time is 4 hours, rise to 170 ℃ after insulation 15 hours, final air cooling, to room temperature, obtains large size high-strength deforming magnesium alloy forging.
Embodiment 2:
It is raw material that the present embodiment be take large size wrought magnesium alloys forging; Described large size wrought magnesium alloys forging is magnesium-aluminum-zinc series deformation magnesium alloy forging, and each element mass percent is: Al8.2-8.5; Zn0.4-0.5; Mn0.2-0.25; Cu<=0.05; Ni<=0.005; Si<=0.15; Be<=0.02; Fe<=0.05; Other Za Zhi<=0.3; Surplus is Mg.
By large size wrought magnesium alloys forging black furnace charging, be warming up to 90 ℃ of ageing treatment 45 hours, then design temperature is 180 ℃, the heating-up time is 3 hours, rise to 180 ℃ after insulation 20 hours, final air cooling is to room temperature; Obtain large size high-strength deforming magnesium alloy forging, it is carried out to the mechanical property detection, detected result is as shown in table 1.
As can be seen from Table 1: after the two-stage time effect process of the present embodiment, each of stamp work heavy wall place and thin-walled place to mechanical property be greatly improved, tensile strength rising 35-45MPa, yield strength improves 30-50MPa.Adopt traditional single-stage aging technique, when thin-walled place mechanical property reaches suitable strength 385.6MPa, the heavy wall place does not reach the timeliness peak value yet, can infer: when heavy wall place mechanical property reaches the timeliness peak value, the thin-walled place is in overaging state.Therefore, although traditional single-stage aging technique also can improve the strength of materials to a certain extent, its comprehensive mechanical property everywhere is not so good as thermal treatment process of the present invention, and reaches timeliness peak value Time Inconsistency everywhere.
Comparative Examples 1
It is raw material that this Comparative Examples be take large size wrought magnesium alloys forging; Described large size wrought magnesium alloys forging is magnesium-aluminum-zinc series deformation magnesium alloy forging, and each element mass percent is: Al8.2-8.5; Zn0.4-0.5; Mn0.2-0.25; Cu<=0.05; Ni<=0.005; Si<=0.15; Be<=0.02; Fe<=0.05; Other Za Zhi<=0.3; Surplus is Mg.
By large size wrought magnesium alloys forging black furnace charging, then design temperature is 180 ℃, and the heating-up time is 4 hours, rise to 180 ℃ after insulation 20 hours, final air cooling is to room temperature; Obtain large size high-strength deforming magnesium alloy forging, it is carried out to the mechanical property detection, detected result is as shown in table 1.
Table 1 magnesium alloy forging is the different process mechanical property everywhere
Claims (7)
1. the thermal treatment process of a large size high-strength deforming magnesium alloy forging, it is characterized in that: large size wrought magnesium alloys forging, at 80 ℃-100 ℃, is incubated after 36-48 hour, with the temperature rise rate of 15-30 ℃/h, is warming up to 160-180 ℃, insulation 15-20 hour, be cooled to room temperature.
2. the thermal treatment process of a kind of large size high-strength deforming magnesium alloy forging according to claim 1, it is characterized in that: by large size wrought magnesium alloys forging at 90 ℃-100 ℃, be incubated after 40-45 hour, temperature rise rate with 20-30 ℃/h is warming up to 160-180 ℃, insulation 15-20 hour, be cooled to room temperature.
3. the thermal treatment process of a kind of large size high-strength deforming magnesium alloy forging according to claim 2, it is characterized in that: the wall thickness of described large size wrought magnesium alloys forging is 30-100mm; Its diameter of phi>=680mm, maximum horizontal shadow area>=0.4m
2.
4. the thermal treatment process of a kind of large size high-strength deforming magnesium alloy forging according to claim 3, is characterized in that, described large size wrought magnesium alloys forging comprises following component by percentage to the quality:
Al 8.2～8.5%, Zn 0.4～0.5%, Mn 0.2～0.25%, Cu<=0.05%, Ni<=0.005%, Si<=0.15%, Be<=0.02%, Fe<=0.05%, other Za Zhi<=0.3%, surplus is Mg.
5. the thermal treatment process of a kind of large size high-strength deforming magnesium alloy forging according to claim 4, is characterized in that, the mechanical property of the large size wrought magnesium alloys forging after thermal treatment is as follows:
Transverse tensile strength is 356MPa-389.7MPa; Transverse yield strength is 249.5MPa-290.3MPa; Endwise tensile strength is 282.5MPa-290.6MPa; Vertically yield strength is 187.8MPa-192.5MPa.
6. the thermal treatment process of a kind of large size high-strength deforming magnesium alloy forging according to claim 4, is characterized in that, by following method, prepared by described large size wrought magnesium alloys forging:
After getting the large size magnesium alloy and forging cake and be machined to blank by the blank dimension of design, be heated to 380～430 ℃, after insulation 3-6h, carry out an isothermal die forging process moulding under 380～430 ℃, obtain forging, take out after forging coolingly, obtain finished product; The average crystal grain Li Du of described large size magnesium alloy forging cake<=15 μ m, the ratio of equi-axed crystal number and total number of die >=0.95; During isothermal die forging process, the downstream rate of patrix is 0.05～0.2mm/s, and the descending time of patrix is 10-30min, and pressure is 35000-80000kN, pressurize 30-40min after moulding; ; Isothermal die forging process mould therefor and die holder reference plane coordinate Jian Xi<=0.2mm; The temperature of mould equates with the Heating temperature of blank; The speed of cooling of forging is 100-150 ℃/min.
7. the thermal treatment process of a kind of large size high-strength deforming magnesium alloy forging according to claim 6 is characterized in that: described large size magnesium alloy is forged cake and is processed by following step by the cast magnesium alloys ingot:
Step 1
Cast magnesium alloys ingot after homogenizing thermal treatment is heated to 400-430 ℃, after insulation 6-10h, carries out at 400-430 ℃ that pier is thick, pulling; The forging ratio that pier is thick is 1.5-2; The forging ratio of pulling is: 1.02-1.05, and pier is thick, during pulling, and its Deformation velocity is 12～16mm/s; The diameter of described cast magnesium alloys cylinder ingots is 300mm～350mm, and the scope of aspect ratio is 1.5～1.85; Described pulling is that the 12-16 face rolls pulling; Described homogenizing thermal treatment is described cast magnesium alloys ingot to be warming up to after 320-350 ℃ to the temperature rise rate with 12-27 ℃/h again with the temperature rise rate of 20-25 ℃/min be warming up to 410-430 ℃, insulation 20-30h, then the speed of cooling with 2-10 ℃/min is cooled to room temperature;
Step 2
Heating in repeating step one, insulation, pier are thick, pulling technique, until magnesium alloy forging stock diameter is more than or equal to 670mm, obtain large size magnesium alloy forging cake; In repeating step, the thick temperature of each insulation, pier before low 10～20 ℃ of the thick temperature of once insulation, pier.
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| CN105022873A (en) * | 2015-07-10 | 2015-11-04 | 中南大学 | On-line reconstruction method of isothermal stamping mold temperature field |
| CN106544608A (en) * | 2016-10-19 | 2017-03-29 | 航天材料及工艺研究所 | A kind of manufacturing process of special thickness fine grain magnesium alloy with high strength and ductility forging |
| CN106607665A (en) * | 2015-10-23 | 2017-05-03 | 中国兵器工业第五九研究所 | Forming method for magnesium alloy component |
| CN113414332A (en) * | 2021-06-21 | 2021-09-21 | 四川捷贝通能源科技有限公司 | Fully soluble slip tooth material and preparation method and application thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105022873A (en) * | 2015-07-10 | 2015-11-04 | 中南大学 | On-line reconstruction method of isothermal stamping mold temperature field |
| CN106607665A (en) * | 2015-10-23 | 2017-05-03 | 中国兵器工业第五九研究所 | Forming method for magnesium alloy component |
| CN106544608A (en) * | 2016-10-19 | 2017-03-29 | 航天材料及工艺研究所 | A kind of manufacturing process of special thickness fine grain magnesium alloy with high strength and ductility forging |
| CN106544608B (en) * | 2016-10-19 | 2018-02-09 | 航天材料及工艺研究所 | A kind of manufacturing process of the thick fine grain magnesium alloy with high strength and ductility forging of spy |
| CN113414332A (en) * | 2021-06-21 | 2021-09-21 | 四川捷贝通能源科技有限公司 | Fully soluble slip tooth material and preparation method and application thereof |
| CN113414332B (en) * | 2021-06-21 | 2022-05-13 | 四川捷贝通能源科技有限公司 | Fully soluble slip tooth material and preparation method and application thereof |
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