ABSTRACT AISI 316L powder mix was sieved in three particle sizes and successively compacted on rings with two different H/(Dext-Dint) ratios. The height and diameters were measured by a CMM at the green and at the sintered state. The shrinkage was calculated to study the influence of particle size and geometry on the anisotropy of dimensional change. As expected, the volumetric shrinkage increases moving from coarser to finer particle size, and the measurements confirmed the anisotropy of the dimensional variation. The measurements revealed that the lowest rings shrink more than the taller rings. The reference to the radial and axial stress during prior cold compaction shows an interesting correlation, in which shrinkage increases on increasing the stress. The further investigation of the deviatoric stress and the deviatoric shrinkage provided a possible explanation of the anisotropy of dimensional change on sintering as a function of the inhomogeneity of the compaction stress.

中文翻译：

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基于单轴冷压的各向异性应力场对AISI 316L环各向异性烧结收缩成因的新解释

摘要 AISI 316L 粉末混合物被筛分为三种粒度，并依次压实在具有两种不同 H/（Dext-Dint）比率的环上。高度和直径由 CMM 在生坯和烧结状态下测量。计算收缩率以研究粒径和几何形状对尺寸变化各向异性的影响。正如预期的那样，体积收缩率从较粗的粒度到较细的粒度增加，并且测量结果证实了尺寸变化的各向异性。测量结果表明，最低的环比较高的环收缩得更多。先前冷压期间径向和轴向应力的参考显示出一种有趣的相关性，其中收缩随应力增加而增加。