Abstract
High strength WC-10%Co alloys having grain size of about 2.2μ and high bending strength as reached arithmetic mean values of 350-370kg/mm2 according to ASTM-B406-64 were vacuum-sintered. Mechanical properties of the alloys, such as hardness, crack length around Vickers hardness indentation and impact strength were investigated mainly in relation to the bending strength and carbon content, and the results were compared with those obtained in conventional alloys having strength of about 290-340kg/mm2.Experimental results are summarized as follows: (1) Hardness of all the alloys used in this study appeared not to be affected by the bending strength, but it depends on the carbon content. (2) Increase in bending strength and carbon content decreased crack length around Vickers hardness indentation and improved impact strength. (3) It was concluded that the alloys which are expected to be excellent for practical use should be obtained at the medium carbon content.
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