短时均热工艺对蛇行通道浇注的半固态铝合金浆料温度和组织的影响  

Effects of Short-term Holding Process on Temperature and Microstructure of Semi-solid Aluminum Alloy Slurry Poured by a Serpentine Channel

作　　者：吴宗闯[1] 毛卫民[1] 陈正周[1] 

机构地区：[1]北京科技大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2010年第10期909-912,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50774007);国家重点基础研究发展计划(973计划)资助项目(2006CB605203);国家高技术研究发展计划(863计划)资助项目(2006AA03Z115)

摘　　要：采用蛇形通道浇注制备半固态A356铝合金浆料,试验研究了短时电磁感应均热工艺对浆料温度和组织的影响规律。结果表明,利用短时电磁感应均热可以使蛇形通道浇注的半固态A356铝合金浆料的内部温差显著变小,最终可达到±1℃,可以满足流变成形的需要。同时,经过短时电磁感应均热后,初生α-Al晶粒得到进一步球化,但也发生了晶粒粗化。均热功率对蛇形通道浇注制备的半固态A356铝合金浆料组织有一定的影响。当均热功率为1.6～3.6kW时,随均热功率的增大,均热时间缩短,初生α-Al晶粒更细小。浆料的均热温度对蛇形通道浇注制备的半固态A356铝合金浆料组织有一定的影响。当浆料温度为595～608℃时,浆料的均热温度越低,初生α-Al晶粒越细小。Semi-solid A356aluminum alloy slurry was prepared by a serpentine channel,and the slurry was heated for a short time by an induction heating system and then finally quenched in water to observe effects of short-time electromagnetic heating on temperature and microstructure of the slurry.The results reveal that temperature difference between the inner slurry and periphery slurry can be decreased greatly through short-term induction heating process,reaching the range of±1℃,fulling meeting the requirements of rheo-forming.Meanwhile,primaryα-Al phase becomes more spherical with the coarseness of grain size.Heating power has some effects on microstructure of the slurry when heating power is in range of 1.6～3.6kW,with increasing in heating power,heating time is shortened and primaryα-Al phase is refined.The slurry temperature has also somewhat effects on the slurry microstructure.When the temperature is in range of 595～608℃,with decreasing in temperature,the primaryα-Al phase is refined.

关 键 词：半固态 A356铝合金 蛇形通道 感应加热 

分 类 号：TG292[金属学及工艺—铸造]