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首页> 外文期刊>ISIJ international >Simulation of Sintering Process – Effects of Contraction Force by Particle Shrinkage and Melted Particle Volume on Growth of Void and Crack –
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Simulation of Sintering Process – Effects of Contraction Force by Particle Shrinkage and Melted Particle Volume on Growth of Void and Crack –

机译：烧结过程的模拟-颗粒收缩和熔融颗粒体积的收缩力对空洞和裂纹的增长的影响-

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The particle and the air motions in the nearly full scale sintering bed have been simulated to elucidate the void (crack) formation mechanism and the crack growth mechanism. The simulation results showed that the contraction force produced the large scale cracks in the wide area in the fixation zone above the melting zone. Since the contraction force acts toward the particle center from each contact point, the resultant force in the inhomogeneous configuration of contact point moves the particles in the melted liquid. This migration produced the agglomerate which grew continuously. The bed weight in the sintering particle bed disrupted the large agglomerate. Through the process the cracks (voids) further grew and merged to a large scale crack. Large scale cracks developed taking account of the contraction force well represented the measured large scale cracks in the full scale sintering bed obtained using CT scan. In the case that the liquid volume produced by melting was large such as 88% of particle volume, the distance between the neighboring particles in the melted liquid became large and the liquid film between particles became thick. Thus it became hard for particle to move by the resistance force in the liquid. Therefore the agglomerate and the void did not grow to the large scale crack. The agglomeration of particles for 88% of particle volume melted was not so fast that the sintering bed in which the agglomerate particles uniformly distributed was formed.
机译：模拟了近满尺寸烧结床中的颗粒和空气运动，以阐明空隙（裂纹）形成机理和裂纹扩展机理。仿真结果表明，收缩力在熔化区上方的固着区的宽阔区域内产生了大范围的裂纹。由于收缩力从每个接触点作用于颗粒中心，因此，在接触点的不均匀构型下的合力使颗粒在熔融液体中移动。这种迁移产生了不断增长的附聚物。烧结颗粒床中的床重破坏了大的附聚物。在此过程中，裂缝（空隙）进一步增长并融合为大规模裂缝。考虑到收缩力而产生的大尺寸裂纹很好地代表了使用CT扫描获得的全尺寸烧结床中测得的大尺寸裂纹。在通过熔融产生的液体体积大如颗粒体积的88％的情况下，熔融液体中相邻颗粒之间的距离变大并且颗粒之间的液膜变厚。因此，颗粒难以通过液体中的阻力移动。因此，附聚物和空隙没有发展成大规模的裂纹。对于88％的熔化的颗粒，颗粒的团聚不是那么快，以致于形成了烧结颗粒均匀分布的烧结床。

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