ワイヤ放電加工を受けた超薄肉WC-Co合金板の抗折強度とじん性

概要

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Thickness dependence of bending fracture strength and fracture toughness of WC-Co alloy plates of varying WC particle size, machined by wire electric discharge(WED), was investigated in the thickness range of 0.1 to 3 mm. The WED specimens of the alloy with the smaller size WC exhibited a decrease in the bending fracture strength to the extent of one half with the reduction in thickness from 1 mm to 0.1-0.3 mm range. However, the specimens machined by grinding(GR)showed an opposite trend, as observed by a considerable increase in the bending fracture strength with decrease in the thickness. On the otherhand, the successive microgrinding of 2μm after the WED machining improved the bending fracture strength to the extent of GR specimens. The fracture toughness of the WED specimens were significantly decreased in a thickness range of 0.1-0.3 mm, in the same way as the GR specimens. Also, with lowering in the thickness, the chipping around the corner of reground surface became easier. In the WED specimens, coarsening of WC particle improved the bending fracture strength and the fracture toughness, particularly in the ultra-thin specimens.
社団法人日本材料学会の論文
1999-01-15