中文摘要：

运用View cast模拟软件对烧结机台车消失模铸造过程进行数值模拟,预测铸造工艺所产生的缩孔、缩松的位置和大小。模拟结果表明,铸造工艺实现了铸件的顺序凝固,铸件没有产生缩孔、缩松等缺陷,铸件组织致密,符合技术要求。观察材料的组织发现,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℃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。氧化实验分析发现,温度对试样的氧化速率有较大的影响,主要因为不同温度下试样表面生成不同的氧化膜,使试样的氧化速率有较大的差异。

英文摘要：

The simulation software View cast was used to predict the sizes and positions of the shrinkage in the trolley produced by lost foam casting. The simulation result showed that the sequence solidification was achieved in the casting process; no defect was observed which are satisfied with the technical requirements. The microstructure of the material was observed under the optical microscope and the as-cast microstructure was mainly consist of ferrite, pearlite and spherical graphite. When heated to 500 ℃ and 700 ℃, there was no obvious change of the hardness and micro- structure. While heated to 900 ℃, phase transformation happened, and broken and net-like ferrite were formed. At the same time, the samples also had a significant increase in hardness. It can be learned from the oxidation experiments analysis that the temperatures have great influence on the oxidation rate of sample, and reason for this phenomenon is that different thickness of oxide films were formed under different temperatures, as a result, the oxidation rate of the samples treated under different temperatures is different.