KR20150033811A - Method for manufacturing forged magnesium alloy mebmer having enhanced hardness and forged magnesium alloy member manufactured thereby - Google Patents
Method for manufacturing forged magnesium alloy mebmer having enhanced hardness and forged magnesium alloy member manufactured thereby Download PDFInfo
- Publication number
- KR20150033811A KR20150033811A KR20130113382A KR20130113382A KR20150033811A KR 20150033811 A KR20150033811 A KR 20150033811A KR 20130113382 A KR20130113382 A KR 20130113382A KR 20130113382 A KR20130113382 A KR 20130113382A KR 20150033811 A KR20150033811 A KR 20150033811A
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- KR
- South Korea
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- magnesium alloy
- forging
- manufacturing
- forged
- compressive stress
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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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
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Abstract
Description
The present invention relates to a method of manufacturing a magnesium alloy forging member and a magnesium alloy forged member manufactured thereby.
Magnesium alloys are the most densely lightweight metal materials among the available structural materials, and are attracting attention in the automotive and electronic parts industries due to their excellent properties such as high nobleness, excellent machinability, vibration absorbing ability and electromagnetic wave shielding.
The molding method for such a magnesium alloy is casting such as die casting, but the casting method is excellent in moldability, while a large number of internal defects such as shrinkage pores are generated, And its surface is very coarse, which requires a lot of time and cost in the post-treatment process for the post-casting surface, making it unsuitable for producing high quality magnesium alloy products requiring high strength.
On the other hand, forging as a plastic working process is suitable for producing a magnesium alloy of high quality having a dense microstructure with minimal defects, so that various magnesium alloy forging members are manufactured, and a scroll compressor equipped with a scroll compressor Scrolling, engine parts for automobiles (such as valve lifters for engine intake and exhaust valves), and the like.
However, since the magnesium alloy forging member such as the scroll has hardness less than expected, there is a need for a manufacturing method of a magnesium alloy forging member having improved hardness.
The present invention provides a method for manufacturing a magnesium alloy forging member having improved hardness by controlling the microstructure of a magnesium alloy forging member and a magnesium alloy forging member manufactured by the method.
According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: (a) preparing a forging member made of a magnesium alloy; And (b) applying a compressive stress to the forged member. The present invention also provides a method of manufacturing a magnesium alloy forged member, the method comprising:
Further, the present invention proposes a method for producing a magnesium alloy forging member having improved hardness, wherein the magnesium alloy is AZ31, AZ61 or AZ80.
Also, in the step (b), a compressive stress is applied in a direction parallel to the basal plane of the magnesium alloy crystal, and a method for manufacturing the magnesium alloy forging member with improved hardness is proposed.
Further, in the step (b), twinning is caused in the microstructure of the magnesium alloy constituting the forging member by applying compressive stress, thereby proposing a method of manufacturing a magnesium alloy forging member with improved hardness.
Further, the present invention proposes a method of manufacturing a magnesium alloy forged member with improved hardness, wherein the forging member is a scroll.
Further, in the step (b), the compressive stress is applied to the wrap portion of the scroll, and a method for manufacturing the magnesium alloy forged member with improved hardness is proposed.
Further, the strain of the wrap portion is 0.5 to 6%. The method for manufacturing the magnesium alloy forging member with improved hardness is proposed.
Further, a magnesium alloy forging member manufactured by the above manufacturing method is proposed.
Further, a scroll produced by the above production method is proposed.
According to the method of manufacturing a magnesium alloy forging member according to the present invention, a compressive stress is applied to a magnesium alloy forging member to induce twinning in the magnesium alloy, thereby improving the hardness of the magnesium alloy forging member Can be produced.
Figs. 1 (a) and 1 (b) are a plan view and a cross-sectional view, respectively, of a scroll used for preparing a specimen in Examples and Comparative Examples of the present invention.
2 (a) to 2 (c) are graphs showing the relationship between the three points (the top, the top, and the bottom) of the specimen along the length direction of the specimen in the magnesium alloy forging specimens prepared in Examples 1, Center, and bottom) of the microstructure of the microstructure.
Fig. 3 is a photograph showing the result of observation of a crystal structure of a cross section of a scroll used for preparing a specimen in Examples and Comparative Examples of the present invention. Fig.
4 is a graph showing Vickers hardness (H V ) measurement results of the magnesium alloy forgings produced in Examples 1 and 2 and Comparative Examples of the present invention.
Hereinafter, the present invention will be described in detail.
A method of manufacturing a high strength magnesium alloy sheet according to the present invention comprises the steps of: (a) preparing a forged member made of a magnesium alloy; And (b) applying compressive stress to the forging member, wherein each step is described in detail below.
Step (a) of the manufacturing method according to the present invention is a step of preparing a forging member made of a magnesium alloy by molding a billet or the like made of a magnesium alloy through a forging process.
The method of preparing the magnesium alloy forging member through the forging process in this step is not particularly limited. That is, in the case of the means for performing the forging, it can be done by any method such as press forging or hammer forging, and the hot forging or the cold forging It can be done by either.
Also, the shape of the forged member prepared through this step is not particularly limited. That is, various kinds of forged members can be prepared through known methods such as free forging or die forging using a magnesium alloy.
For example, commercially available magnesium alloys such as AZ31 (Mg-3Al-1Zn), AZ61 (Mg-3Al-1Zn), and the like may be used as the forging member. 6Al-1Zn), AZ80 (Mg-8Al-0.5Zn), and the like.
Step (b) of the manufacturing method according to the present invention is a step of applying a compressive stress to the magnesium alloy forging member prepared in the step (a) to improve the hardness of the magnesium alloy forging member.
By carrying out this step, the microstructure of the magnesium alloy constituting the forging member can be controlled. More specifically, tensile twinning is induced in the microstructure of the magnesium alloy by applying compressive stress to the magnesium alloy forging member, thereby improving the hardness of the magnesium alloy forging member by reducing the grain size of the magnesium alloy. Can be achieved.
Meanwhile, it is preferable that the compressive stress applied to the forging member in this step is applied in a direction parallel to the basal plane of the magnesium alloy crystal forming the forging member, that is, in a direction perpendicular to the basal pole, When compressive stress is applied in this manner, more twinning can be induced in the magnesium alloy.
Further, when compressive stress is applied to the magnesium alloy member through this step, the strain of the forging member is preferably 0.5 to 6%. When the strain is less than 0.5%, sufficient magnesium alloy grain refinement is not achieved to improve the hardness of the forged member. When the strain exceeds 6%, the effect of improving the hardness due to refinement of the magnesium alloy grain is insignificant. There is a problem that additional processing may be required depending on the deformation.
The magnesium alloy forging member manufactured according to the above manufacturing method can be substituted for various forging members made of conventional steel materials such as a scroll and the like by having magnesium alloy itself not only light weight but also high hardness, It is expected that the application field of magnesium alloy will be greatly expanded.
Hereinafter, the present invention will be described in detail on the basis of embodiments. The presented embodiments are illustrative and are not intended to limit the scope of the invention.
< Example 1>
After the wrap portion is cut from a scroll produced by hot forging a commercial magnesium alloy (A6) shown in the plan and sectional views in Figs. 1 (a) and 1 (b) Was subjected to a compressive stress such that a strain of 1% was generated in the longitudinal direction at room temperature using a gleeble tester, thereby producing a magnesium alloy forging specimen subjected to compressive stress.
< Example 2>
After the wrap portion is cut from a scroll produced by hot forging a commercial magnesium alloy (A6) shown in the plan and sectional views in Figs. 1 (a) and 1 (b) Was subjected to compressive stress by using a gleeble tester so that a strain of 3% in the longitudinal direction was generated at room temperature, thereby producing a magnesium alloy forging specimen under compressive stress.
< Comparative Example >
A wrap portion was cut from a scroll produced by hot forging a commercial magnesium alloy (A6) shown in a plan view and a sectional view in Figs. 1 (a) and 1 (b) to manufacture a magnesium alloy forging specimen Respectively.
< Experimental Example 1> Example One, Example 2 and In the comparative example Observation of Microstructure of Forged Magnesium Alloy Specimens
Figs. 2 (a) to 2 (c) are graphs showing the relationship between the three points of the specimen (top, middle and bottom) of the magnesium alloy forging specimens prepared in Examples 1, 2, (center) and bottom (bottom)) of the microstructure.
According to Fig. 2 (a) to Fig. 2 (c), in the case of the specimens prepared in the comparative examples, twinning tissues were hardly found, but in the specimens prepared in Examples 1 and 2, In particular, twinning tissues were more frequently found in the specimen prepared in Example 2, where deformation due to compressive deformation was larger than that in the specimen prepared in Example 1.
The microstructure observation results show that the compressive stress is applied in the longitudinal direction of the lap since the basal plane shown in red is located horizontally or horizontally close to the longitudinal direction of the lap, This is because tensile twinning is induced.
From the above results, it can be confirmed that miniaturization of the magnesium alloy grain was achieved by generating twin crystal structure in the specimen as compressive stress is applied to the magnesium alloy forging specimen.
< Experimental Example 2> Example One, Example 2 and In the comparative example Measurement of mechanical properties of fabricated specimens
As a result of conducting Vickers hardness (H V ) test (test load: 500 gf, dwell time: 5 sec) on the magnesium alloy specimen in Examples 1, 2 and Comparative Example, It can be seen that the hardness at each measurement point increases as the strain due to stress increases.
That is, when the magnesium forged member is manufactured according to the present invention, the magnesium alloy forging member having improved hardness can be manufactured by controlling the microstructure of the magnesium alloy through twinning induction.
Claims (9)
(b) applying a compressive stress to the forging member, wherein the hardness is improved.
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| KR20130113382A KR20150033811A (en) | 2013-09-24 | 2013-09-24 | Method for manufacturing forged magnesium alloy mebmer having enhanced hardness and forged magnesium alloy member manufactured thereby |
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| KR20130113382A KR20150033811A (en) | 2013-09-24 | 2013-09-24 | Method for manufacturing forged magnesium alloy mebmer having enhanced hardness and forged magnesium alloy member manufactured thereby |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108754365A (en) * | 2018-05-25 | 2018-11-06 | 湖南工学院 | A kind of high density twin structure ZK21 magnesium alloy block materials preparation methods |
| US11286544B2 (en) * | 2017-01-11 | 2022-03-29 | The Boeing Company | Calcium-bearing magnesium and rare earth element alloy and method for manufacturing the same |
| KR20230103010A (en) * | 2021-12-30 | 2023-07-07 | 주식회사 엠에프알씨 | Manufacturing method for mounting bracket for transport equipment |
-
2013
- 2013-09-24 KR KR20130113382A patent/KR20150033811A/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11286544B2 (en) * | 2017-01-11 | 2022-03-29 | The Boeing Company | Calcium-bearing magnesium and rare earth element alloy and method for manufacturing the same |
| CN108754365A (en) * | 2018-05-25 | 2018-11-06 | 湖南工学院 | A kind of high density twin structure ZK21 magnesium alloy block materials preparation methods |
| KR20230103010A (en) * | 2021-12-30 | 2023-07-07 | 주식회사 엠에프알씨 | Manufacturing method for mounting bracket for transport equipment |
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