提出了液相线半连续铸造制备铝合金半固态浆的新工艺， 研究了液相线半连续铸造7075合金的微观组织及其在二次加热过程中的变化。在液相线温度下(908K)半 连续铸造的7075合金组织为均匀、细小的蔷薇状组织， 晶粒平均等积圆直径为29.7μm， 晶粒平均圆度为1.87。经二次加热后，铸造组织逐渐转变为等轴晶。 在849K下加热60min后， 晶粒平均等 积圆直径为57.6μm，平均圆度为1.49。在869K下加热30min后,晶粒平均等积圆直径为47.2μm，平均圆度为1.54。结果表明， 液相线半连 续铸造可以获得理想的7075合金半固态浆料。
A new process， liquidus semi-continuous casting(LSC) to produce semi-solid slurries of aluminum alloy, was presented. The casting and remelted microstructures of 7075 alloy cast by LSC were studied. The microstructures cast at liquidus temperature(908K) by LSC is uniform， fine and rose flowered. The average equal-area-circle grain diameter is 29.7μm and the average roundness is 1.87. The casting microstructures are gradually turned into equiaxed grains by being remelted. After the casting billet are soaked at 849K for 60min， the average equal-area-circle grain diameter is 57.6μm and the average roundness is 1.49. After the casting billet is soaked at 869K for 30min， the average equal-area-circle grain diameter is 47.2μm and the avege roundness is 1.54. The results show that fine semi-solid slurries of 7075 alloy can be obtained by LSC.
参考文献
| [1] | Flemings M C .Behavior of metal alloys in the semi-solid state[J].Metallurgical and Materials Transactions,1991,22(06):269-293. |
| [2] | Kirkwood D H .Semi-solid metal processing[J].International Metals Reviews,1994,39(05):173-189. |
| [3] | 毛卫民,赵爱民,钟雪友.半固态金属成形应用的新进展与前景展望[J].特种铸造及有色合金,1998(06):33-36. |
| [4] | 谢水生;黄声宏.半固态金属加工技术及其应用[M].北京:冶金工业出版社,1999 |
| [5] | 苏华钦,朱鸣芳,高志强.半固态铸造的现状及发展前景[J].特种铸造及有色合金,1998(05):1-6. |
| [6] | 刘丹;崔建忠.无搅拌制浆新技术液相线铸造[J].铸造技术,1998(06):44-46. |
| [7] | 刘丹,崔建忠,夏克农.液相线铸造铝合金2618显微组织[J].东北大学学报（自然科学版）,1999(02):173-176. |
| [8] | 崔建忠,路贵民,刘丹.半固态浆制备技术的新进展[J].哈尔滨工业大学学报,2000(04):110. |
| [9] | Yue J T;Voltmer F W .Influence of gravity-free solidification on solute microsegregation[J].Journal of Crystal Growth,1975,29:329-334. |
| [10] | Chalmers B.The structure of ingots[J].Journal of the Australian Institute of Metals,1963(08):255-259. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%