High Speed Production Process of Magnesium Alloy Sheets using electric vibration and different speed rolling

电振动差速轧制镁合金板材高速生产工艺

基本信息

批准号：
15360076
负责人：
WATARI Hisaki
金额：
$ 9.28万
依托单位：
Oyama National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360076/
关键词：
magnesium alloy twin roll caster strip casting semi-solid different speed rolling electricvibration solidification modeling high aluminum contents electronic vibration magnesium alloys semisolid defferent speed rolling structural r

项目摘要

The Magnesium alloys are expected to play an important role as next-generation materials, which have possibilities of contributing to lighten the total product weight when magnesium products can be used to replace aluminum and mild steel products. The specific density of magnesium alloy is about 2/3 that of aluminum and 1/4 of that of iron. When alloyed, magnesium has the highest strength-to-weight ratio of all the structural metals. Moreover, because of the ease of recycling of metallic materials, magnesium has received global attention from the standpoint of environmental preservation. Utilization of magnesium alloys has mainly depended on casting technology, for instance, thixso-forming because of its less workable characteristics due to the crystal structure of the hexagonal close-packed lattice. Recently, demands have been raised in automotive and electronics industries to reduce the total product weight. Unfortunately, the major barrier to greatly increased magnesium alloy use is still primarily high manufacturing cost. One of the keys to solving this problem is to develop semi-solid roll strip casting technology to manufacture. The following conclusions are obtained.1)Sheet thicknesses of cast strips could be predicted by a simple 1-D solidification model. It is found that an appropriate roll gap should be decided by considering the predicted cast thicknesses and the mill stiffness of the twin roll caster.2)A temperature of over 250℃ was necessary to keep a cast magnesium alloy sheet from cracking in the hot rolling process.3)An appropriate annealing temperature is effective for homogenizing microstructure of rolled cast sheets after the strip casting process.4)The grain size of the manufactured wrought magnesium alloys sheet was less than 10 micrometer. The obtained magnesium alloy sheet shows equivalent limiting drawing ratio in a warm drawing test.

镁合金有望作为下一代材料发挥重要作用，当镁产品可以替代铝和低碳钢产品时，有可能有助于减轻产品的总重量。镁合金的比重约为2。镁的强度是铝的/3，是铁的1/4，在所有结构金属中，镁具有最高的强度重量比，而且由于金属材料易于回收利用，镁受到了全球的关注。从环境保护的角度来看。镁合金的利用主要依赖于铸造技术，例如触变成型，因为其六方密排晶格的晶体结构导致其可加工性较差。最近，汽车和电子行业提出了降低镁合金含量的要求。不幸的是，大幅增加镁合金使用的主要障碍仍然是高制造成本，解决这一问题的关键之一是开发半固态轧带连铸技术来制造。 1)可以通过简单的一维凝固模型来预测铸带的板厚。我们发现，应考虑预测的铸带厚度和双辊连铸机的轧机刚度来确定合适的辊缝。2)为了防止铸造镁合金板在热轧过程中开裂，需要超过250℃的温度。3）适当的退火温度对于薄带连铸后轧制铸板的组织均匀化是有效的。4）镁合金的晶粒尺寸这所制造的变形镁合金板的厚度小于10微米。所获得的镁合金板在温拉拔试验中表现出相当的极限拉拔比。