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 Posted: Wed 1:34, 12 Jan 2011 Post subject: ugg stivali New Sloping Plate semi-solid casting A |
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New Sloping Plate semi-solid casting Al-20Si alloy
The lightest metal, its density, strength, more than just high, with excellent electrical conductivity, thermal conductivity, good dimensional stability, good electromagnetic shielding characteristics, so in the aerospace, automotive, computer, communications and other industries have been rapidly development. However, the research and development of magnesium alloys is still not sufficient, the production technology is not mature and perfect in urgent need of further development of forming technology of magnesium alloy, reduce production difficulties, improve product quality to meet different application requirements. ... The subject of semi-solid forming of magnesium alloy casting, study related tests conducted Chun]. 1.1 Test Materials Test Method 1, selection of raw materials AZ91D alloy, the liquidus temperature of 595oC, solidus temperature of around 470oC, suitable for semi-solid processing, the chemical composition of alloys in Table l. Table 1AZ91D the chemical composition of magnesium alloy%! Blue!! Was!! 8.3 1.2 ~ 9.70.35-1.000.15 ~ 0.200.00140.0310.00490.00110.002 margin test process raw materials, first joined the resistance of magnesium alloy in the heating and melting crucible furnace,[link widoczny dla zalogowanych], melting agents by covering fire and at 740oC for modification, Modifier with CC1; then put it aside, cooling to the liquidus 595oC the following range of solid-liquid two-phase mechanical stirring,[link widoczny dla zalogowanych], stirring speed 100 ~ 1200r/min, prepared by semi-solid slurry; and then above the solidus temperature, the semi-solid slurry casting machine rolls into the middle of the casting shape. Equipment and test procedure details see [8,9]. Before and after casting in the casting specimens were selected to produce metallurgical sample. Metallography microscope in MeF3 based on advanced, the specimen with the volume fraction of 5% hydrochloric acid corrosion. 2 test results and analysis of semi-solid magnesium alloy 2.1 tissue changes before and after casting in continuous casting u test equipment,[link widoczny dla zalogowanych], and the semi-solid magnesium alloy continuous casting pilot study was prepared by semi-solid magnesium alloy strip. Before and after casting in the casting specimens were selected to produce metallurgical samples, the microstructure observed in Figure 1. As can be seen from Figure 1, before and after the semi-solid casting organizations significantly different. ① In the organizational form, the casting of the primary solid particles before the angular, with clear traces of dendrites; casting later in comparing the primary round of solid particles, nearly spherical. ② In the solid fraction,[link widoczny dla zalogowanych], the solid fraction after casting before the casting was significantly higher than that. This trend in different temperature are reflected in roll, but different in different casting temperature solid fraction, the lower the temperature the more solid fraction Received Date :2006-05-22 Fund: the National Science and Technology Research Institute The Special Fund for Technology Development Project (NCSTE a JKZX a 2002 a 071); Education Department of Scientific and Technological Projects in Jiangxi Province (Jiangxi Education Technology word E2005] l8 number) the first author: Zhang Songyang, male, born 1975, Ph.D., Nanchang Mechanical and Electrical Engineering University, Nanchang (330029), Tel :0791-7288794, 13607040872, E-mail: zhangkmust @ yahoo. com. cnA1.20Si alloy semi-solid billets, si organization of primary crystal a great improvement. (2) pouring temperature, tilt angle and the length of the board is of primary crystal size and distribution of Si, an important factor in this trial, angle O / = 45. , Sloping plate length L = 300mm, pouring temperature t = 630oC, sloping plate process at room temperature, even under the conditions of the early availability of small crystal Si organization. References 1 Li Sing. Piston new hypereutectic Al-Si alloy. China Foundry Machinery & Technology, 1997430 (2) :19-212 Wang Dengfeng, China Jiang industry, Lu Dehong, et al. Electromagnetic Stirring and Modification combined effects of A1-20Si alloy of primary silicon phase. Special Casting & Nonferrous Alloys, 2005,[link widoczny dla zalogowanych],25 (12): 737 ~ 7393 Ye Chunsheng, Xin-Ping Zhang, Pan rule. Mechanical Stirring on hypereutectic Al-si alloy semi-solid tissue. Thermal processing technology, 2002 (1): 27 ~ 294HagaT. SemisolidStripCastingUsingaTwinRollCasterEquippedwithaCoolingSlope. J. ofMater. Proc. Tech. ,2002,130-131 :558-5615 Ren States, Kang Liwen, Shang Jianhong, et al. Inclined Cooling shear process conditions on the impact of semi-solid alloy. Special Casting & Nonferrous Alloys, 2005,25 (1O): 6OO a 603 (Editor: Yuan Zhenguo)
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