| Abstrakt: |
The structures of magnetoabrasive powders from iron-carbon melts alloyed with carbideforming elements constitute disperse systems which can arbitrarily be divided into two groups: 1) structures characterized by the presence of two distinct types of components — a monocarbide (TiC, Nb4,C3, ZrC, or VC), which possesses abrasive qualities, and a ferromagnetic (Fe-Si) matrix, which ensures the necessary magnetic properties, and 2) structures characterized by the fact that abrasive functions are performed by all their structural constituents — a double carbide formed by iron together with an alloying element (Si, Mo, W, or Cr) and a martensitic (bainitic) matrix. The particles of an atomized magnetoabrasive powder from any given alloyed melt have structures differing in macromorphology, which is a result of differences in conditions of solidification of metal drops during melt disintegration. In the presence of carbide-forming elements silicon in an iron-carbon melt dissolves mainly in ferrite, without significantly affecting the morphology of structure of the atomized particles. The effectiveness of magnetoabrasive machining (polishing) depends to a large extent on the choice of abrasive and work materials. |
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