Mechanical Properties and Metallurgical Qualities of Magnesium Alloy Sheets Manufactured by Twin-Roll Casting
Mechanical Properties and Metallurgical Qualities of Magnesium Alloy Sheets Manufactured by Twin-Roll Casting
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DOI：
10.4028/www.scientific.net/kem.345-346.165
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发表时间：
2007-08
期刊：
影响因子：
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通讯作者：
H. Watari;R. Nakamura;R. Paisern;Nobuhio Koga;K. Davey
中科院分区：
文献类型：
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作者：
H. Watari;R. Nakamura;R. Paisern;Nobuhio Koga;K. Davey
本文研究了一种有利于经济地制造高质量镁合金板材的制造工艺和技术。研究了AZ31、AZ61、AM60和AZ91四种镁合金在双辊薄带连铸中的适宜工艺条件。改变熔融材料的温度和轧辊速度，以找到合适的制造条件。根据轧辊速度和上下轧辊之间的辊缝，阐明了制造条件对可能成形的影响。此外，还对成品铸件的显微组织进行了观察。结果表明，在水平铜辊铸机上，以20m/min的速度可以生产出厚度为2.5~4.5 mm的镁薄板。研究还发现，采用铸轧工艺生产的AZ31、AZ61、AM60和AZ91四种铸态镁板材，只要在铸轧过程中生产出合适的镁板，即可用于塑性成形。通过温拉深试验还表明，对于高铝镁合金板材，常规挤压工艺或直流铸造热轧工艺难以生产的AZ91板材，极限拉深比为2.4是可能的。
This paper is concerned with a manufacturing process and technology to facilitate the economical manufacture of high-quality magnesium alloy sheets. Magnesium alloys AZ31, AZ61, AM60 and AZ91 were used to investigate the appropriate anufacturing conditions for use in twin-roll strip casting. Temperatures of the molten materials and roll speeds were varied to find the appropriate manufacturing conditions. The effects of manufacturing conditions on possible forming were clarified in terms of roll speeds and roll gaps between upper and lower rolls. In addition, microscopic observation of the microstructure of the finished casting was performed. It was clarified that a magnesium sheet of 2.5 to 4.5mm thickness could be produced at a speed of 20 m/min by a horizontal copper roll caster. It was also found that the cast magnesium sheet of AZ31, AZ61, AM60 and AZ91 manufactured by roll strip casting could be used for plastic forming if the appropriate magnesium sheets were produced after the roll casting process. By a warm deep drawing test, it also demonstrated that a limiting drawing ratio of 2.4 was possible in the case of AZ91 sheet that was difficult to be manufactured by conventional extrusion process or DC casting and hot-rolling process for magesium alloy sheets with high aluminium contents.