论文部分内容阅读
运用View Cast模拟软件对烧结机栏板消失模铸造过程进行数值模拟,预测铸件可能产生缩孔、缩松的位置和大小。结果表明,铸件实现了顺序凝固,没有产生缩孔、缩松等缺陷,铸件组织致密。铸态组织主要以铁素体、珠光体以及球状石墨为主,加热至500、700℃时组织和硬度没有发生明显变化;当加热至900℃时发生相变,产生破碎状铁素体和网状铁素体,硬度显著增大。氧化试验分析发现,不同温度下试样表面生成结构和成分均不同的氧化膜,影响铁和氧的扩散速率,使试样的氧化速率有较大的差异。
Using View Cast simulation software to simulate the lost foam casting process of the sintering machine, predicting the position and size of the castings that may cause shrinkage and shrinkage. The results show that the castings achieve the order of solidification, no shrinkage, shrinkage and other defects, dense castings. The as-cast microstructure is dominated by ferrite, pearlite and spheroidal graphite. The microstructure and hardness did not change significantly when heated to 500 and 700 ℃. When heated to 900 ℃, the transformation took place, resulting in crushed ferrite and mesh Ferrite, hardness increased significantly. The results of oxidation test showed that the oxide film with different structure and composition was formed on the surface of the sample at different temperatures, which affected the diffusion rate of iron and oxygen, which caused great difference in the oxidation rate of the sample.