Magnesium alloy sheet having improved formability at room temperature, and method for manufacturing same
a technology of magnesium alloy and formability, which is applied in the field of magnesium alloy sheets, can solve the problems of insufficient formability, weak brittleness and elasticity of magnesium materials, and poor product quality, and achieve the effect of improving the formability of magnesium materials and improving normal temperature formability
Inactive Publication Date: 2013-08-15
KOREA INST OF MASCH & MATERIALS
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Benefits of technology
The present invention improves the formability of magnesium materials at normal temperatures by performing a pretreatment process that adds compressive residual stress to the surface of the material. This results in a magnesium alloy sheet that can be easily formed into large-sized parts. The invention allows for a continuous process of mass production.
Problems solved by technology
However, the magnesium material (pure magnesium or magnesium alloy) is different from the existing steel plate or aluminum alloy sheet in the manufacture and processing thereof because magnesium has a low elongation at a normal temperature.
Magnesium has a hexagonal close packed (HCP) structure and fails to have a slip system enough to be freely modified at a normal temperature, and thus has very strong brittleness and insufficient formability which have been pointed out as limitations.
However, the casting method requires a mold to be separately manufactured, and thus is disadvantageous in that the manufacturing time and the manufacturing cost increase, the product quality is not uniform due to a high defective proportion, and it is difficult to manufacture the mold in the form of thin plate.
However, in the case of the above-described warm forming, there are problems in that it is difficult to implement a continuous process for mass production, and it is not appropriate for commercializing the warm forming method due to problems such as costs, and the like.
Method used
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Preparation of Magnesium Alloy Raw Material
[0042]Under the conditions described in the following Table 1, raw materials corresponding to Comparative Examples 1 to 3 and Examples 1 to 4 were prepared. The base material was AZ31B, and a sheet having a thickness of 1.6 mm, which was manufactured through a Strip Casting process, was used. The Strip Casting refers to a process of manufacturing the sheet by cooling a molten metal while directly being passed between a rolling roll.
[0043]As the process of imparting compressive residual stress, a shot peening process was used. Under conditions such as a pressure of 0.8 MPa and a spray distance of 15 cm as the working conditions, a shot ball (Alumina Powder #240) was sprayed for 60 to 120 seconds.
[0044]Meanwhile, the annealing was maintained at each temperature for 20 to 60 minutes, and then air-cooling was performed.
TABLE 1Whether annealingWhether process ofis performed andimparting compressiveprocessingresidual stress istemperatureperformed...
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Abstract
Provided are a magnesium alloy sheet having improved formability at room temperature and a method for manufacturing same. According to one embodiment of the present invention, the method for manufacturing the magnesium alloy sheets having improved formability at room temperature is characterized by comprising a first pretreatment step of applying residual compression stress to the surface the magnesium alloy raw material.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to and the benefit of Korean Patent Application No. 10-2010-0105012 filed in the Korean Intellectual Property Office on Oct. 27, 2010, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a magnesium alloy sheet and a method of manufacturing the same, and more particularly, to a magnesium alloy sheet with improved normal temperature formability and a method of manufacturing the same.BACKGROUND OF THE INVENTION[0003]A magnesium material has a density which is just two thirds that of aluminum and one fourth that of iron, and has a thermal conductivity 1.2 times that of zinc and two times that of iron when alloyed with other metals, and has an excellent heat dissipation characteristic even when compared to plastics and the like. Further, the magnesium material has excellent electromagnetic-wave shielding property, vibration absorption property,...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22C23/00B24C1/10C22F1/06
CPCB24C1/10B24C5/005C22C23/02C22F1/06Y10T29/47C21D7/06C22C23/00Y10T29/479C21D7/04
Inventor LEE, YOUNG SEONKWON, YONG NAMKANG, SEONG HOONLEE, KWANG SEOKKIM, DAE YONGKIM, JI HOONKIM, SANG WOO
Owner KOREA INST OF MASCH & MATERIALS