High speed production method of wrought magnesium alloy sheets using semi-solid twin roll strip casting and its plastic characteristics in warm deep drawing

采用双辊连铸机对镁合金半固态铸轧薄带进行了实验研究。人们已经认识到，如果可以用轻金属生产的半固态材料来替代传统的钢铁产品，半固态成形有助于减轻产品的总重量。然而，镁合金的利用问题仍然主要与制造成本高有关。在本实验中，采用AZ31、AZ91、AM50和AM60四种镁合金来确定哪种镁合金适合于半固态薄带连铸。通过改变熔体的温度、上下辊的轧辊速度，以找到合适的制造条件。根据熔体与轧辊之间的接触条件，阐明了冷却和接触条件对可能成形的影响。肌萎缩侧索硬化症…此外，还对成品铸件的结晶进行了显微观察。结果表明，以25m/min的速度可以生产出厚度为2.5~4.0 mm的镁板。研究了AZ31B镁合金半固态铸轧后热轧板材的深冲性能，论证了AZ31B镁合金铸轧工艺的可行性。改变熔融镁的温度和轧辊速度，以找到合适的制造条件。改变了热轧和热处理条件，以考察哪种条件适合生产变形镁合金板材。对所制备的变形镁合金的晶体进行了微观观察。研究发现，在半固态薄带铸轧后热轧镁合金薄板的温拉深工艺中，极限拉深比为2.7是可能的。较少

An experimental approach has been performed to ascertain the effectiveness of semi-solid roll strip casting of magnesium alloys using a twin roll caster. It has been recognized that semi-solid forming contributes to lightening the total product weight if semi-solid material produced by light metals can be used to replace conventional iron and steel products. However, the problems of utilizing magnesium alloys are still mainly related high manufacturing cost. This means that improved quality must be balanced by economic validity In this experiment, magnesium alloy AZ31, AZ91, AM50 and AM60 were used to determine which were appropriate for use in semi-solid roll strip casting. Temperature of the molten materials, roll speeds at upper and lower rolls, which could be changed independently, were varied to find an appropriate manufacturing condition. Effects of cooling and contact condition on possible forming were clarified in terms of contact condition between molten material and roll. Als … More o, microscopic observation of the crystals of the finished casting has been performed. It has been found that magnesium sheet with 2.5 to 4.0mm thickness could be produced at a speed of 25m/min. It also found that the hot rolled cast magnesium sheets produced by semi-solid manufacturing process could be used for plastic forming.Warm deep drawability of magnesium alloy sheets that were hot-rolled after a semi-solid roll strip casting process was investigated to demonstrate the feasibility of roll strip casting of AZ31B magnesium alloy. The temperature of the molten magnesium, and the roll speeds were varied to find appropriate manufacturing conditions. Hot rolling and heat treatment conditions were changed to examine which condition would be appropriate for producing wrought magnesium alloys sheets. Microscopic observation of the crystals of the produced wrought magnesium alloys was performed. It has been found that a limiting drawing ratio of 2.7 was possible in the warm deep drawing process of the cast magnesium alloy sheets that were hot-rolled after a semi-solid roll strip casting process. Less