Specific Features of Microstructure Formation in Co–Cr–Ni–W–Ta Alloys and Their Mechanical Properties

Resumo

The microstructure and mechanical properties of three experimental compositions of a new heat- and corrosion-resistant cast cobalt-based alloy have been investigated. It is established that compositions are reinforced as a result of the formation of carbide phases in them during aging. It is shown that the ultimate and yield strength of this material at a temperature of 20°C are, respectively, 650(50) and 440(10) MPa. An analysis of the heat resistance of alloy samples has revealed that they withstand loads of 170 MPa (for 329 h) and 25 MPa (for 1093 h) at temperatures of 800 and 1100°C, respectively. The mechanical properties of the new alloy are superior of those of the foreign heat-resistant alloy FSX-414.