WO2013058504A2 - 편석 현상을 최소화한 상온 성형성이 우수한 비열처리형 마그네슘 합금 판재 - Google Patents
편석 현상을 최소화한 상온 성형성이 우수한 비열처리형 마그네슘 합금 판재 Download PDFInfo
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- WO2013058504A2 WO2013058504A2 PCT/KR2012/008357 KR2012008357W WO2013058504A2 WO 2013058504 A2 WO2013058504 A2 WO 2013058504A2 KR 2012008357 W KR2012008357 W KR 2012008357W WO 2013058504 A2 WO2013058504 A2 WO 2013058504A2
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- WIPO (PCT)
- Prior art keywords
- magnesium alloy
- alloy sheet
- segregation
- heat treatment
- magnesium
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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
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/04—Casting aluminium or magnesium
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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
-
- 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
Definitions
- the present invention relates to a thin plate-cast magnesium alloy sheet, more specifically, through the adjustment of the alloy components, not only can significantly reduce casting defects such as central segregation or reverse segregation, but also subsequent heat treatment through the precipitated phase formed during the rolling process.
- the present invention relates to a non-heat treated magnesium alloy sheet material having improved room temperature formability by suppressing grain growth in a process.
- Magnesium alloy is an alloy for structural materials with low specific gravity, excellent specific strength and rigidity. Recently, the demand for light electronic devices such as mobile phones and laptops is increasing, and automotive materials for fuel efficiency are also increasing. have. However, research on magnesium alloys has been mainly limited to casting parts, and in particular, attention has been focused on improving high-temperature properties for application to automotive engines and gear parts, while processing magnesium alloys that can be applied to various fields such as sheet materials. The study was insufficient.
- magnesium plate produced by the thin plate casting method has been much researched and commercialized as it has a large utilization among the processing alloys.
- AZ31 alloy is the only processing magnesium sheet manufactured by sheet casting, which has mechanical properties that can be most commonly used in the industrial market.
- the present invention has been researched and developed for the purpose of improving and solving the defect of the cast structure and low mechanical strength and room temperature formability of the conventional thin magnesium casting alloy, the casting defect such as segregation through the adjustment of the magnesium alloy composition It is an object of the present invention to provide a non-heat-treated magnesium alloy plate material which can obtain good room temperature formability with considerable mechanical strength without reducing expensive rare earth elements by controlling the microstructure.
- the present invention comprises Al: 1 to 3% by weight, Sn: 0.5 to 3% by weight and consists of the remaining magnesium, the average value of Vickers hardness (Hv) due to central segregation and reverse segregation It provides a non-heat treatment magnesium alloy sheet, characterized in that the deviation is up to 10 Hv or less.
- the magnesium alloy sheet according to the present invention is a thin cast
- the microstructure may include a Mg 2 Sn secondary phase.
- the Mg 2 Sn secondary phase volume fraction is 5% or less.
- the magnesium alloy sheet according to the present invention is characterized in that the yield strength is 200MPa or more, the limit dome height (LDH) is 5mm or more, more preferably 6mm or more.
- the magnesium alloy sheet according to the present invention is characterized in that the fraction of the tension twin, which is tilted at 85 to 90 ° in the parents grain after molding, is 5% or more.
- Magnesium alloy sheet according to the present invention greatly improved the defects of reverse segregation and central segregation generated in the alloy produced by the sheet casting process due to the change in the solidification section according to the additive alloy element, and undergoes a heat treatment process for high forming Afterwards, it is possible to provide a magnesium alloy sheet having a mechanical strength superior to that of a conventional non-heat treatment thin cast magnesium alloy.
- the magnesium alloy sheet provided in the present invention exhibits excellent moldability without adding expensive rare earth elements added for existing high forming properties and high strength properties, thereby increasing market competitiveness for other lightweight structural materials.
- FIG. 1 is a schematic view of a sheet casting apparatus for producing a magnesium alloy sheet used in an embodiment of the present invention.
- Figure 2 is a diagram showing the distribution of hardness values in the thickness direction, respectively, by dividing the alloy plate randomly taken from the magnesium alloy plate and commercial AZ31 alloy according to the present invention into five equal parts.
- Figure 3 shows the composition distribution of the cross section of the cast structure in the magnesium alloy sheet and commercial AZ31 alloy according to the present invention through EPMA.
- FIG. 5 is a schematic view showing a method for evaluating the limit dome height of the magnesium alloy sheet according to the present invention.
- Figure 6 shows the shape after the room temperature limit dome height (LDH) experiment of the magnesium alloy sheet (a) and commercial AZ31 alloy (b) according to the present invention.
- Figure 7 shows a cutting plane for analyzing the specimens subjected to the limit dome height experiment.
- FIG. 8 is a graph showing grain changes of the magnesium alloy (a) and the commercial AZ31 alloy (b) according to the present invention in the portion shown in FIG. 7.
- Magnesium alloy sheet according to the present invention Al: 1 to 3% by weight, Sn: 0.5 to 3% by weight, consisting of the remaining magnesium, the deviation of the Vickers hardness (Hv) average value due to central segregation and reverse segregation It is a maximum of 10 Hv or less, It is characterized by the non-heat treatment type.
- the solidification section of the material has a great influence on the segregation and the degree of casting.
- the liquid-liquid region of solid coexistence inside the sheet is squeezed from the center to the surface due to the compression by the two rolls.
- the segregation zone with high compositional density is formed, which is called reverse segregation.
- Such reverse segregation develops more seriously in alloys with a long solidification section.
- Aluminum alloys with relatively narrow solidification sections tend to have less tendency of reverse segregation than magnesium alloys with long solidification sections, and even magnesium alloys have a different degree of segregation when the solidification section differs depending on the alloying elements.
- This reverse segregation not only makes it difficult to control the microstructure of the cast material, but also has to be homogenized at a high temperature for a long time, and adversely affects mechanical properties as well as surface treatment.
- the present inventors in order to solve the problems of the reverse segregation as described above, adjusted the solidification section of the magnesium alloy used for sheet casting within a range that does not inhibit the mechanical properties, as in the magnesium alloy according to the present invention, 1 ⁇ 1
- the alloy provided in the present invention may form a solidification section of 50 K or less, similar to that of the aluminum alloy, to greatly reduce reverse segregation.
- the tendency of the reverse segregation can be confirmed by the alloy composition distribution.
- the alloy composition distribution in the casting structure is high in the center and the plate edge.
- the variation in composition in the thickness direction is not large.
- Magnesium alloy sheet according to the present invention has a composition deviation of 10% or less, whereas the variation of the overall composition distribution in the sheet thickness direction has 30 to 50% on average in the case of commercial AZ31 sheet cast material.
- the difference in the composition distribution in the casting material shows a partial hardness difference.
- the tendency of the segregation zone can be quantified by using the hardness difference, and the magnesium alloy sheet according to the present invention is characterized in that the variation of the Vickers hardness (Hv) mean value in the sheet thickness direction is at most 10 Hv or less.
- the magnesium alloy sheet according to the present invention exhibits excellent mechanical properties compared to conventional commercial AZ31 due to the formation of the Mg 2 Sn secondary phase.
- Non-heat treatment alloys do not use a heat treatment process to control the microstructure, so there are limited reinforcement mechanisms that can be used to increase mechanical strength.
- the volume fraction of the Mg 2 Sn secondary phase is 5% or less.
- the main reinforcing mechanism is the subsequent work heat treatment such as rolling, and the mechanical strength increases as the annealing time passes due to the annealing of the strain along with grain growth after annealing. A sharp drop is observed, which becomes more pronounced as the annealing temperature increases.
- the volume fraction of the secondary phase in the homogenization treatment after casting is greatly reduced, but after the dynamic precipitation during the rolling process, the magnesium alloy is finely distributed inside the tissue again and the distribution of the secondary phase is crystallized in the annealing process. It is possible to prevent a significant drop in mechanical strength even after long-term heat treatment by inhibiting growth.
- the reason for limiting the composition of the magnesium alloy as described above is that when the Al content is less than 1% by weight, the effect of improving the fluidity and strength during casting is insufficient. This is because the segregation control effect is not sufficient.
- the volume fraction of the Mg 2 Sn secondary phase is small, which contributes to the improvement of mechanical properties, and when added at 3% by weight or more, the homogenization treatment temperature and time are lengthened.
- the secondary phase formed in the process is locally distributed in large quantities, which adversely affects the molding and the elongation.
- magnesium is poor in formability due to the absence of a slip system at room temperature, but twin behavior is known to be important as a deformation factor to replace the slip system.
- Magnesium alloy sheet according to the present invention is an alloy having excellent room temperature formability different from the existing AZ31 alloy due to the development of the tension twin of the parent particles (parents grain) of the twin twine forming an angle of 85 ⁇ 90 ° To provide.
- the raw materials of pure Mg (99.9%), pure Al (99.9%), and pure Sn (99.9%) were mixed with CO 2 and SF 6 through the melting furnace 10 of the twin roll sheet casting process equipment shown in FIG.
- the molten metal was injected between two cooling rolls 30 using a nozzle 20 to prepare a plate.
- the gap between the two cooling rolls was maintained at about 2mm and the rotational speed of the cooling roll was maintained at about 4m / min during the injection of the molten metal.
- the casting speed of the molten metal was cast to be 200 ⁇ 300K / s under these conditions.
- a magnesium alloy sheet having a length of about 5 m, a width of about 70 mm, and a thickness of about 2 mm was obtained.
- FIG. 2 shows the thickness direction of an arbitrary portion of a 10 cm length specimen by dividing the AZ31 (comparative example) sheet manufactured by POSCO and the AT33 (Example 2) magnesium alloy sheet arbitrarily selected in 50 cm length into 5 equal parts. It is shown by measuring the hardness to. At this time, the Vickers hardness was measured conditions of 100gf load, holding time 5 seconds.
- the hardness of the AZ31 is locally high at the central portion and the surface portion, and the overall variation is not uniform.
- AT33 Example 2
- the hardness difference due to segregation is partially shown, but the deviation value is within 10 Hv on average, whereas in the case of AZ31 alloy, the deviation is more than 10 to 20 Hv on average. Compared to the overall uniform value is shown.
- the plate material cast as mentioned above was subjected to the following processing heat treatment as follows. First, the cast plate was subjected to solution treatment at 400 ° C. for 3 hours. Next, the solution-treated plate
- Hot rolling was carried out at 50% of the final reduction rate in 5 passes while giving a reduction ratio of 10% per pass to obtain a sheet having a final thickness of about 1 to 0.7 mm.
- the thin plate casting and the heat treated plate material were annealed as shown in Table 1 below, and mechanical properties and formability were evaluated.
- tensile specimens having a gauge length of 12.6 mm, a gauge width of 5 mm, and a thickness of 1 mm were prepared and subjected to a tensile test at a strain rate of 6.4 ⁇ 10 ⁇ 4 s ⁇ 1 .
- FIG. 2 is a schematic diagram showing a method for evaluating the limit dome height (LDH) of the magnesium alloy sheet according to an embodiment of the present invention.
- LH limit dome height
- a disk-shaped test piece having a diameter of 50 mm and a thickness of 0.7 mm was prepared, and then, the test piece was inserted between the upper die and the lower die, and the specimen was fixed with a force of 5 kN.
- Lubricant oil was used as a known press oil.
- the alloy which is provided as a non-heat treatment alloy, tends to decrease mechanical strength with annealing time and with increasing annealing temperature, as is the typical non-heat treatment alloy AZ31. That is, the LDH value tends to increase.
- Figure 3 shows the state of the specimen after the LDH evaluation of the commercial AZ31 and AT alloy
- Figure 4 shows the tissue change of the top portion and the most undeformed edge in the cross section of the specimen shown in Figure 3 as shown in FIG.
- the angle between the normal direction of the plate and the direction of the (0002) basal plane of the magnesium hexagonal crystal is shown graphically. This means that the higher the fraction at the bottom angle, the more the texture of the (0002) face is developed, and the more the fraction is dispersed, the more random the tissue is.
- a higher fraction (fraction) is shown in the elevation after deformation than the commercial AZ31, which is due to the tension twin formed during the deformation process. These tensile twins contribute greatly to the improvement of formability in the magnesium lacking slip system.
- the present invention not only makes uniform casting structure and greatly improves defects due to segregation through the control of alloy elements with a narrow solidification section, but also has excellent mechanical strength and formability without using expensive rare earth elements.
- the magnesium alloy sheet according to the present invention is a non-heat treatment type alloy can be used for various applications because the yield strength and LDH value shows a linear change with the annealing time.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Crystallography & Structural Chemistry (AREA)
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- Metal Rolling (AREA)
Abstract
Description
합금 | 공정 조건 | YS (MPa) | UTS(MPa) | El.(%) | LDH(mm) |
AZ31 (비교예) | As received (POSCO) | 200 | 281 | 25 | 2.9 |
AT31(실시예1) | 50% 압연 | 249 | 280 | 13.5 | |
50% 압연 + 150/1h | 216 | 270 | 12 | 5.2 | |
50% 압연 + 150/5h | 213 | 268 | 12.5 | ||
50% 압연 + 200/1h | 165 | 248 | 20 | ||
50% 압연 + 200/3h | 168 | 245 | 19 | 6.6 | |
50% 압연 + 200/5h | 170 | 248 | 20.2 | 7.3 | |
50% 압연 + 250/1h | 146 | 233 | 15 | 6.8 | |
AT33(실시예2) | 50% 압연 | 275 | 316 | 3.5 | |
50% 압연 + 150/1h | 255 | 299 | 6.5 | 4.3 | |
50% 압연 + 150/3h | 233 | 278 | 15.3 | 4.7 | |
50% 압연 + 200/1h | 219 | 283 | 21 | 5.2 | |
50% 압연 + 200/3h | 210 | 273 | 19 | 6.2 |
Claims (6)
- Al: 1 ~ 3중량%, Sn: 0.5 ~ 3중량%를 함유하고, 나머지 마그네슘으로 이루어지며, 중심편석 및 역편석으로 인한 비커스 경도(Hv) 평균값의 편차가 최대 10Hv 이하인 것을 특징으로 하는 비열처리형 마그네슘 합금 판재.
- 제 1 항에 있어서,상기 마그네슘 합금 판재는 박판주조된 것으로서, 그 미세조직은 Mg2Sn 2차 상을 포함하는 것을 특징으로 하는 비열처리형 마그네슘 합금 판재.
- 제 2 항에 있어서,상기 Mg2Sn 2차상의 부피분율은 5% 이하인 것을 특징으로 하는 비열처리형 마그네슘 합금 판재.
- 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,상기 마그네슘 합금 판재는, 항복강도가 200MPa 이상이고, 한계돔 높이(LDH)가 5mm 이상인 것을 특징으로 하는 비열처리형 마그네슘 합금 판재.
- 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,상기 마그네슘 합금 판재는, 항복강도가 200MPa 이상이고, 한계돔 높이(LDH) 6mm 이상인 것을 특징으로 하는 비열처리형 마그네슘 합금 판재.
- 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,상기 마그네슘 합금 판재는, 성형 후 모입자(parents grain)와 85 ~ 90°기울어진 인장쌍정(tension twin)의 분율이 5%이상인 것을 특징으로 하는 비열처리형 마그네슘 합금 판재.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014536978A JP6099656B2 (ja) | 2011-10-20 | 2012-10-15 | 偏析現象を最小化した、常温成形性に優れた非熱処理型マグネシウム合金板材 |
US14/237,892 US20140205489A1 (en) | 2011-10-20 | 2012-10-15 | Non-heat treated magnesium alloy sheet with excellent formability at room temperature in which segreation is minimized |
EP12841026.3A EP2770072A4 (en) | 2011-10-20 | 2012-10-15 | UNTREATED MAGNESIUM ALLOY FOIL WITH EXCELLENT FORMABILITY AT ROOM TEMPERATURE AND MINIMUM SEGREGATION |
CN201280040577.4A CN103781928B (zh) | 2011-10-20 | 2012-10-15 | 偏析最小化的在室温下具有优异成形性的不可热处理镁合金片 |
Applications Claiming Priority (2)
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KR10-2011-0107405 | 2011-10-20 | ||
KR1020110107405A KR101342582B1 (ko) | 2011-10-20 | 2011-10-20 | 편석 현상을 최소화한 상온 성형성이 우수한 비열처리형 마그네슘 합금 판재 |
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WO2013058504A2 true WO2013058504A2 (ko) | 2013-04-25 |
WO2013058504A3 WO2013058504A3 (ko) | 2013-05-23 |
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PCT/KR2012/008357 WO2013058504A2 (ko) | 2011-10-20 | 2012-10-15 | 편석 현상을 최소화한 상온 성형성이 우수한 비열처리형 마그네슘 합금 판재 |
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US (1) | US20140205489A1 (ko) |
EP (1) | EP2770072A4 (ko) |
JP (1) | JP6099656B2 (ko) |
KR (1) | KR101342582B1 (ko) |
CN (1) | CN103781928B (ko) |
WO (1) | WO2013058504A2 (ko) |
Cited By (1)
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CN103290288A (zh) * | 2013-06-26 | 2013-09-11 | 重庆大学 | 一种低成本高塑性变形镁合金及其制备方法 |
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KR101603292B1 (ko) | 2014-04-15 | 2016-03-14 | 한국신발피혁연구원 | 초임계 발포 사출용 저비중 동적 가교형 열가소성 탄성체 조성물, 이의 제조방법 및 이를 이용하여 제조된 신발 겉창 |
KR20160120688A (ko) | 2016-08-29 | 2016-10-18 | 서울대학교산학협력단 | 마그네슘 합금 판재 및 이의 제조방법 |
WO2018155994A1 (ko) * | 2017-02-27 | 2018-08-30 | 한국기계연구원 | 시효열처리형 고강도 마그네슘 합금 및 그 제조방법 |
KR102091563B1 (ko) * | 2017-02-27 | 2020-03-20 | 한국기계연구원 | 시효열처리형 고강도 마그네슘 합금 및 그 제조방법 |
CN110031347A (zh) * | 2019-04-02 | 2019-07-19 | 鞍钢股份有限公司 | 一种测定弹簧钢盘条偏析的方法 |
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CN101643871B (zh) * | 2009-08-24 | 2011-04-13 | 吉林大学 | 一种超高塑性、高强度铸造镁合金及其制备方法 |
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2011
- 2011-10-20 KR KR1020110107405A patent/KR101342582B1/ko not_active IP Right Cessation
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2012
- 2012-10-15 JP JP2014536978A patent/JP6099656B2/ja not_active Expired - Fee Related
- 2012-10-15 CN CN201280040577.4A patent/CN103781928B/zh not_active Expired - Fee Related
- 2012-10-15 EP EP12841026.3A patent/EP2770072A4/en not_active Withdrawn
- 2012-10-15 WO PCT/KR2012/008357 patent/WO2013058504A2/ko active Application Filing
- 2012-10-15 US US14/237,892 patent/US20140205489A1/en not_active Abandoned
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103290288A (zh) * | 2013-06-26 | 2013-09-11 | 重庆大学 | 一种低成本高塑性变形镁合金及其制备方法 |
US20150000800A1 (en) * | 2013-06-26 | 2015-01-01 | Chongqing University | Low-cost high-plasticity wrought magnesium alloy and its preparation method |
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JP6099656B2 (ja) | 2017-03-22 |
WO2013058504A3 (ko) | 2013-05-23 |
KR20130043355A (ko) | 2013-04-30 |
US20140205489A1 (en) | 2014-07-24 |
CN103781928B (zh) | 2016-08-17 |
EP2770072A4 (en) | 2015-06-17 |
KR101342582B1 (ko) | 2013-12-17 |
JP2014535005A (ja) | 2014-12-25 |
CN103781928A (zh) | 2014-05-07 |
EP2770072A2 (en) | 2014-08-27 |
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