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首页> 外文期刊>粉体および粉末冶金 >Numerical Simulation of Sintering Shrinkage Behavior of Stainless-Steel-Powder Compact
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Numerical Simulation of Sintering Shrinkage Behavior of Stainless-Steel-Powder Compact

机译：不锈钢粉末压块烧结收缩行为的数值模拟

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摘要

Sintering shrinkage behavior is numerically simulated on stainless steel powder compacts prepared by powder injection molding (MIM). The MIM process is now highlighted because of its near-net-shape productivity of small mechanical parts having complex shape along with high relative density. In general, however, the initial packing density of the compacts is rather low to be around 55vol. percent in relative density. This should cause large volume change during sintering, restating in the possible nonuniform shrinkage in the compacts. Thus, in the MIM process, the prediction of geometric change of a compact is of extreme importance.The numerical simulation involves finite difference analysis to determine temperature distribution in a compact set in a vacuum furnace, densification analysis by use of sintering rate equations, and finite element analysis to convert the shrinkage into the geometric change of the compact. Six rate equations for sinteringmechanisms summarized by M.F.Ashby are used for the calculation. We have assumed that the six mechanisms are distinguishable and sintering rate is the sum of the six rate equations. It has been demonstrated that the density inhomogeneities due to local temperature differences contribute to the nonuniform shrinkage in the early stage of sintering; however, it attenuates reversely in the final stage.
机译：对通过粉末注射成型（MIM）制备的不锈钢粉末压块的烧结收缩行为进行了数值模拟。由于具有复杂形状和较高相对密度的小型机械零件的近净形生产率，MIM工艺现在得到了重视。但是，一般而言，压块的初始填充密度相当低，约为55vol。相对密度的百分比。这将在烧结过程中引起较大的体积变化，从而恢复压坯中可能出现的不均匀收缩。因此，在MIM过程中，预测压坯的几何变化极为重要。数值模拟包括有限差分分析以确定真空炉中压坯的温度分布，使用烧结速率方程进行致密化分析，以及有限元分析将收缩率转换为压坯的几何变化。 M.F.Ashby总结了六个用于烧结机理的速率方程式。我们假设这六个机制是可区分的，并且烧结速率是六个速率方程的总和。已经证明，由于局部温度差异引起的密度不均匀性导致了烧结初期的不均匀收缩。但是，它在最后阶段会反向衰减。

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