权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

A fundamental studies on wetting between molten metal and a chill block and crystal growth from the chill block

熔融金属与激冷块之间的润湿以及激冷块晶体生长的基础研究

基本信息

批准号：
03650547
负责人：
KUDOH Masayuki
金额：
$ 1.41万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

Using carbon steels, Al-Cu binary alloys, an Al-Si eutectic alloy, and a Sn-Sb binary alloy, a thin shell was formed by a dipping technique. The shape of the shell and the surface in the chill side of the shell were investigated.Following results were obtained from experimental results.(1) The pattern like a tortoise shell was formed in the surface of the chill side of the shell and corresponds to the concave region of the shell, in which solidification retarded. (2) An uneven shell was formed in a hypoperitectic carbon steel. (3) A chill zone was formed in the steel containing low carbon content and fine dendrites were formed in the steel containing high carbon content. Extended dendrites grew from the chill crystals and the fine dendrites. In a hypoperitectic carbon steel, the extended dendrites grew randomly based on the mixing of the chill crystals and the fine dendrites, so that solidification proceeded unevenly. (4) Ripple marks was formed in the surface of the chill side of the shell in Al-Cu binary alloys and an Al-Si alloy, but it weren't depend on the uneven growth of the shell. (5) Button marks were observed in the surface of the chill side of the shell in a Sn-Sb binary alloy and it corresponded to the convex region of the Sn-Sb shell. (6) An uneven growth occurred periodically in vertical and horizontal directions of the Al-Cu shell, but it was occurred only a horizontal direction of the Al-Si shell. (7) Heat resistance should be introduced to computer simulation in order to cause the uneven growth of the solidifying shell.Considering from above results, there are two types of the shell fromation. One is that it depends directly on nucleation such as a Sn-Sb alloy. The other is that it depends on the correlation among nucleation, latent heat and solid deformation due to thermal stress.

采用碳钢、Al-Cu二元合金、Al-Si共晶合金和Sn-Sb二元合金，采用浸镀法制备薄壳。对壳体的形状和壳体冷侧表面进行了研究。根据实验结果得到如下结果：(1)龟壳状花纹在壳体冷侧表面形成，与壳体凹区相对应，在凹区凝固迟缓。(2)在低晶碳钢中形成不均匀的壳层。(3)低含碳量钢形成冷区，高含碳量钢形成细枝晶。从冷晶和细枝晶中生长出伸长的枝晶。在低晶碳钢中，随着冷晶和细晶的混合，延伸枝晶的生长是随机的，因此凝固过程是不均匀的。(4) Al-Cu二元合金和Al-Si合金在壳体冷侧表面形成波纹痕迹，但波纹痕迹并不取决于壳体的不均匀生长。(5)在Sn-Sb二元合金壳体的冷侧表面观察到扣痕，与Sn-Sb壳体的凸区相对应。(6) Al-Cu壳在垂直方向和水平方向上周期性地不均匀生长，而Al-Si壳只在水平方向上不均匀生长。(7)为使凝固壳生长不均匀，应在计算机模拟中引入耐热性。从以上结果来看，有两种类型的壳形成。一是它直接取决于成核，如Sn-Sb合金。另一方面，它取决于成核、潜热和热应力引起的固体变形之间的相关性。