抄録
In recent years, the low-pressure HIP equipments as low as up to about 10 MPa have been developed. The present work was concerned with the effectiveness of low-pressure (≤5 MPa) HIP on the micro-pore elimination for WC-Co alloys having different cobalt contents, carbon contents and carbide grain sizes. The relation between transverse-rupture strength and the sorts of structural defects appearing on the fracture surfaces was studied in detail for both alloys sintered, and subsequently low-pressure HIP-ed. The above relation was also studied for sintered and then commonly high-pressure HIP-ed alloy. It was found that the medium and high carbon alloys with more than about 7%Co were easily HIP-ed even at the pressure of 1 MPa, but for the alloy with low cobalt content (-5%Co), the pressure of about 3 MPa was needed for the perfect elimination of micro-pores.
