Observation of Nonmetallic Inclusions in Aluminumdeoxidized Iron Alloy

铁合金去氧化化的含体中的含体已被调查。Al-去氧化的液体铁是用超快速冷却设备固态的，它是由头部调查员建造的，或在铜模具或水中组装的。铁合金中的包含物是由TEM观察到的，通过一种新的方法来准备TEM规格，其中还由首席调查员开发。这些铁物质中Al_2O_3、FeO·Al_2O_3、FeO和反常SiO_2的表面包括被观察到的。最小的球体包括的大小达到了几个纳米的顺序，并且它们是FeO·Al_2O_3。这些包含的大小就变成了更大的冷却速度退化了。因此，这些包括被指定为第二次去氧化产品。更进一步，铝的包含不是阿尔法-铝，而是伽马、Delta、Kappa、rheta-铝。一个基于奥斯特瓦尔德的步骤规则和同源核理论的概念，导致了这些包含可能有经验地证明了液体铝的状态，并最终确定为伽马、Delta、Kappa、rheta-铝。“模拟硅的包含取决于这一过程的一个证据。在另一方、牙科和地图之类的主氧化产品在这个实验中被观察到，没有根据冷却速度改变它们的尺寸。”FeO·Al_2O_3 inclusions formed near the diffusing front of Al would play an important role on the formation of these primary deoxidation products。

The inclusions in iron alloy deoxidized with aluminum were investigated. The Al-deoxidized liquid iron were solidified using ultra-rapid cooling device, which was constructed by the head investigator, or quenched in copper mold or in water. The inclusions in iron alloy were observed by TEM through the new method of preperation of the specimen for TEM which was developped also by the head investigator. The spherical inclusions of Al_2O_3, FeO・Al_2O_3, FeO and amorphous SiO_2 inclusions in these iron specimens were observed. The smallest size of the spherical inclusions reaches to the order of a few nm and they are FeO・Al_2O_3. The size of these inclusions became larger as the cooling speed decreased. Therefore, these inclusions were regarded as the secondary deoxidation product. Further, the alumina inclusions were not the alpha-alumina, but the gamma, delta, kappa, rheta-alumina.A consideration based on the Ostwald's step rule and homogeneous nucleation theory lead the result that these inclusions have probably experienced the state of liquid alumina in the cource of the cooling and finally solidified as the gamma, delta, kappa, rheta-alumina. The amorphous silica inclusions are considered to be one evidence of this process.On the other hand, the dendritic and maple-like primary deoxidation products were observed in this experiment which did not change their size according to the cooling speed. The fine FeO・Al_2O_3 inclusions formed near the diffusing front of Al would play an important role on the formation of these primary deoxidation products.