Abstract
For developing the high strength WC-10%Co sintered alloy, coarse grained alloys were sintered in vacuum in various manufacturing processes. The grain size was kept constant (2-3μ) in all specimens, because it is well known that the strength of WC-10%Co alloy should reach a maximum around these grain sizes. The transverse-rupture strength was determined on 20 specimens in each alloy system according to ASTM-B406-64.
The results are as follows: The strength of the alloy depends on the carbon content, contiguity, and so forth, even if no micro pore is present in the structure. Under the optimum conditions, the high and low carbon alloys showed the average transverse-rupture strengths of about 350 and 370kg/mm2, respectively. Therefore, it was confirmed that the strength of such a high strength alloy is affected by the carbon content, as already pointed out by the present authors for the ordinary alloys.
It must be mentioned however, that the true strength would be lower than that obtained actually, taking account for the effect of planar loading resulted from the deformation of the surface at which the load was applied on the specimen.
