立式双辊铸轧镁合金薄带微观组织分析  

Microstructure of Vertical Twin-rolling Casting Magnesium Alloy

作　　者：王广山[1] 邸洪双[1] 黄峰[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室

出　　处：《特种铸造及有色合金》2009年第9期792-794,共3页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展计划(973计划)资助项目(2006CB605208-1);教育部高等学校博士学科点专项科研基金资助项目(20050145021)

摘　　要：在实验室的立式双辊铸机上进行了AZ31B镁合金薄带的铸轧试验。研究了不同工艺下铸轧薄带微观组织,并对不同冷却方式下铸轧镁合金薄带微观组织进行了分析。结果表明,双辊铸轧镁合金晶粒细小、无共析现象发生。铸轧速度对板带的显微组织影响显著,当铸轧速度达到20m/min时,镁合金薄带组织为理想等轴晶。对铸轧态镁合金薄带进行油冷,既防止了薄带表面氧化,又阻止了冷却过程晶粒长大。AZ31B magnesium alloy strip was cast-rolled by experimental vertical twin-roll caster to understand the microstructure of the twin-rolling casting strip. The microstructure of the casting-rolling magnesium alloy strip was observed in condition of varied processing parameters and different cooling rates. The results reveal that fine grain in microstructure of twin-rolled magnesium alloy can be observed in the absence of eutectoid composition. Microstructure of the rolling-casting magnesium alloy strip is closely related to the rolling velocity,where desirable equiaxed crystal can be exhibited in the magnesium alloy strip with rolling at 20 m/min. Surface oxidation on the as-cast strip can be eliminated and the grain growth can be restrained by quenching the strip in oil.

关 键 词：双辊铸轧 薄带 镁合金 显微组织 

分 类 号：TG292[金属学及工艺—铸造]